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International Journal of Mechanical Engineering and Technology (IJMET)
Volume 6, Issue 8, Aug 2015, pp. 118-125, Article ID: IJMET_06_08_011
Available online at
http://www.iaeme.com/IJMET/issues.asp?JTypeIJMET&VType=6&IType=8
ISSN Print: 0976-6340 and ISSN Online: 0976-6359
© IAEME Publication
________________________________________________________________________
PERFORMANCE EVALUATION OF
BIODIESEL WITH A COMBUSTION
ENHANCER ADDITIVE
Biju Cherian Abraham
Assistant Professor, Dept. of Mechanical Engineering,
Mar Athanasius College of Engineering, Kothamangalam, Kerala, India
Albin John Thomas
M Tech Scholar, Dept. of Mechanical Engineering,
Mar Athanasius college of Engineering, Kothamangalam, Kerala, India
ABSTRACT
The major part of all energy consumed worldwide comes from fossil
sources (petroleum, coal and natural gas). However, these sources are
limited, and will be exhausted by the near future. Recently, environmental
degradation and the exhaustion of fossil fuels have increased the amount of
research about alter-native fuels. Thus, looking for alternative sources of new
and renewable energy such as hydro, biomass, wind, solar, geothermal,
hydrogen and nuclear is of vital importance. Alternative new and renewable
fuels have the potential to solve many of the current social problems and
concerns, from air pollution and global warming to other environmental
improvements and sustainability issues. In recent years, much research has
been carried to find suitable alternative fuel to petroleum products. In recent
times, the world is confronted with the twin crisis of fossil fuel depletion and
environmental degradations. The situations have led to the search for an
alternative fuel which should be not only sustainable but also environment
friendly without sacrificing the performance. The different sources for
alternative fuels are edible- and non-edible vegetable oils, animal fats and
waste oil (triglycerides).Vegetable oils, being renewable, are widely available
from variety of sources have low sulfur contents close to zero and hence cause
less environmental damage (lower greenhouse effect) than diesel. In this
research an alternative fuel blend consisting of 80% diesel, 20% jatropha and
5% DEE by volume is used. Performance tests are carried out for this blend at
compression ratios of 16, 17 and 18, and it is found out that at a compression
ratio of 18 the fuel blend has the best performance. This fuel blend is
compared with normal diesel and another blend of 80% diesel and 20%
Performance Evaluation of Biodiesel with A Combustion Enhancer Additive
http://www.iaeme.com/IJMET/index.asp 119 editor@iaeme.com
jatropha at 18CR.All these fuel combinations are compared with each other
and final conclusions are made.
Keywords: Biodiesel, Die Ethyl Ether, Jatropha Diesel Blend
Cite this Article: Biju Cherian Abraham and Albin John Thomas,
Performance Evaluation Of Biodiesel with A Combustion Enhancer Additive.
International Journal of Mechanical Engineering and Technology, 6(8), 2015,
pp. 118-125.
http://www.iaeme.com/currentissue.asp?JType=IJMET&VType=6&IType=8
_______________________________________________________________
1. INTRODUCTION
Over the last century, there has been more than 20 fold increase in the consumption of
energy worldwide and the availability of energy resource plays a critical role in the
progress of a nation. Almost all the human energy needs are currently met from the
fast depleting fossil fuels associated with serious environmental consequences. So it is
important to look for eco-friendly and infinite renewable sources like solar, wind,
hydro and biomass. The ethanol and biodiesel are the two liquid bio fuels that can
replace/substitute gasoline /diesel respectively. The non edible seed plant like
jatropha, pongamia, mahua etc are being considered as indigenous source of oil for
the production of biodiesel. The oil from these plants can be transesterified by suitable
method depending on its FFA content for the production of biodiesel that can be used
to operate a CI engine.
Biodiesel is considered a ‘‘drop-in’’ fuel for combustion systems operating on
conventional diesel fuel. It is renewable, biodegradable, non-toxic, and has properties
similar to diesel fuel; however, it does not have sulfur and aromatics in its
composition. As a clean, biodegradable and renewable fuel, biodiesel is attracting
great interest in engine community. Once the oil resources for the production of
biodiesel starts to available in the country, the availability of biodiesel as substitute of
diesel fuel will increase and dependency on oil import would reduce there by making
the country self sufficient in fuel supplies. Recently, environmental degradation and
the exhaustion of fossil fuels have increased the amount of research about biodiesel
fuels. The main problems associated with the production of biodiesel are its
environmental and social impacts such as food security, land change and water
source. So in order increase the production and usage of biodiesel it is important to
give public awareness about the lack of fossil fuels and the benefits of biodiesel over
it. It is important that the government should take necessary steps to promote the
farming, production and usage of biodiesel [1]. There are several methods for the
production of biodiesel, Dilution, micro-emulsification, pyrolysis and
transesterification are the four major techniques used presently. One of the main
problems encountered in biodiesel usage is its high viscosity. It can be avoided by the
transesterfication of triglycerides by methanol, ethanol, propanol and butanol, hence
produced fuel have low viscosity [2]. Large numbers of studies were conducted to
find out a suitable combination of biodiesel mixtures which has improved
performance characteristics and emission values than diesel. Nowadays studies are
more focused on the usage of duel fuels, the brake thermal efficiency of blends was
found higher than diesel. The emissions of smoke, hydro carbon and nitrogen oxides
of dual biodiesel blends were higher than that of diesel. But the exhaust gas
temperature for dual biodiesel blends was found to be lower than diesel[3].When
Jatropha and Palm biodiesel blends are used as the fuel in diesel engine at idling
Biju Cherian Abraham and Albin John Thomas
http://www.iaeme.com/IJMET/index.asp 120 editor@iaeme.com
conditions it is found that HC & CO emission decreases and NOx emission increases
compared to pure diesel fuel[4].Nowadays emulsified fuels are also used for
conducting the experiments, when 10% biodiesel blend is emulsified using water
upto 15% by volume and tested it is found that with increasing percentage of water,
ignition delay was longer at higher engine loads. Also reductions in emission of CO,
CO2, HC & NOx were observed for the emulsified fuel [5].
In this paper a comparison study between the fossil fuel and biodiesel fuel blend is
explained. A biodiesel fuel blend consisting of 80% diesel 20% jatropha biodiesel and
5% die ethyl ether(B20+additive) is mixed and the performance is evaluated at the
compression ratios of 16,17 and 18.It is found out that at a compression ratio of 18
this biodiesel blend have the maximum performance. So at a compression ratio of
18CR the performance and emission readings of normal diesel, a blend consisting of
80% diesel and 20% jatropha biodiesel(B20) and the B20+Additive mixture is taken
and the comparison between them is done.
2. MATERIALS AND METHODS
2.1. Biodiesel
Biodiesel is produced from vegetable oils or animal fats and an alcohol, through a
transesterification reaction. This chemical reaction converts an ester (vegetable oil or
animal fat) into a mixture of esters of the fatty acids that makes up the oil (or fat).
Biodiesel is obtained from the purification of the mixture of fatty acid methyl esters
(FAME). A catalyst is used to accelerate the reaction. According to the catalyst used,
transesterification can be basic, acidic or enzymatic, the former being the most
frequently used. Biodiesel is biodegradable, nontoxic, and essentially free of sulfur
and aromatics. Biodiesel is considered a renewable resource due to the fact that it is
derived from products that can be grown and produced domestically.
2.2. Preparation of test fuel blends
Various test fuel blends were prepared by blending Jatropha biodiesel with additive
and diesel in various volume proportions. In present study 20% Jatropha biodiesel is
mixed with 80% diesel to make the B20 mixture. For preparing the B20+Additve
mixture 20% jatropha biodiesel, 80% diesel is mixed initially and as an additive di-
ethyl ether is added. The quantity of DEE is 5% of the total volume of B20 mixture.
2.3. The Test Engine
The experimental test rig consists of a variable compression ratio compression
ignition engine, eddy current dynamometer as loading system, fuel supply system for
both Diesel oil supply and biodiesel supply, water cooling system, lubrication system
and various sensors and instruments integrated with computerized data acquisition
system for online measurement of load, air and fuel flow rate, instantaneous cylinder
pressure, injection pressure, position of crank angle and exhaust emissions.
2.4. Experimental procedure
The experimental study was carried out to investigate the performance and emission
characteristics of a direct injection diesel engine with Jatropha biodiesel using
additive and comparing it with that of diesel. The biodiesel, diesel and additives are
mixed in desired proportions for getting the test fuels B20 and B20+Additive.The
engine opted for this experiment has the capability of running in duel fuel and
Performance Evaluation of Biodiesel with A Combustion Enhancer Additive
http://www.iaeme.com/IJMET/index.asp 121 editor@iaeme.com
different compression ratios. Technical specification of diesel engine is elaborated in
the below table1. The diesel engine was initially started with diesel and then with the
prepared test fuels. Speed of the engine was kept constant at 1500 rpm under varying
load conditions to measure the performance parameters such as brake power, brake
thermal efficiency, brake specific fuel consumption and exhaust gas temperature and
also to measure the emission parameters like carbon monoxide, un-burnt hydrocarbon,
carbon dioxide and nitrogen oxide emissions for both diesel and the prepared test
fuels with the help of multi gas analyzer.
Table 1 Engine specification
Engine specification
Make Legion Brothers
No. of Cylinder Single
Cubic Capacity 553cc
Cooling Water
Fuel Diesel
Speed 1400-1500 rpm
HP 5 HP
Starting Crank
Lubrication Forced
3. RESULTS AND DISCUSSION
The performance characteristics of 3 proportions of the fuel such as diesel, B20 and
B20+Additive have been evaluated and the following observations were found out.
3.1 Performance Analysis
3.1.1 Average cylinder pressure
Figure: 1. Average cylinder pressure Vs Crank Angle at 0kg and 9kg load
The peak cylinder pressure depends on the burned fuel fraction during the premixed
burning phase i.e. the initial stage of combustion. In spite of the slightly higher
viscosity and lower volatility of the biodiesel, the ignition delay seems to be lower
than diesel. This may possibly be because a complex and rapid pre-flame chemical
reaction takes place at high temperatures. The use of DEE has decreased the ignition
delay of biodiesel mixture.
Biju Cherian Abraham and Albin John Thomas
http://www.iaeme.com/IJMET/index.asp 122 editor@iaeme.com
3.1.2 Brake Thermal Efficiency
Figure 2 Brake Thermal Efficiency Vs BP Figure 3 SFC Vs BP
At lower brake powers the BTE of biodiesel blend and biodiesel mixtures are
same as that of diesel fuel. It is seen that at higher loads the BTE is higher for
biodiesel blends and biodiesel mixtures. The reasons for this improvement of Brake
thermal efficiency is better combustion and better lubricity of biodiesel. The use of
the additive DEE in biodiesel mixture has improved the oxygen content of the fuel
which in turn increases the brake thermal efficiency.
3.1.3 Specific fuel consumption
SFC is an important parameter that reflects how good the engine performance is.
It is seen that at lower loads biodiesel blend has higher SFC value due to lower
calorific value of biodiesel. As the brake power increases specific fuel consumption is
lower due to complete combustion of fuel taking place.
Figure 4 Volumetric Efficiency Vs BP Figure 5 Mechanical Efficiency Vs BP
3.1.4. Volumetric Efficiency
In fig.4 the volumetric efficiency of the diesel engine mainly depends upon the
combustion chamber temperature. The increase in the chamber temperature increases
the intake air temperature and consequently reduces the mass of air drawn in each
cycle thereby decreasing the efficiency. Biodiesel mixture has higher volumetric
efficiency when compared to biodiesel additive. The reason may be that DEE in
biodiesel mixture has a tendency to decreases the combustion temperature and
increases the oxygen content.
Performance Evaluation of Biodiesel with A Combustion Enhancer Additive
http://www.iaeme.com/IJMET/index.asp 123 editor@iaeme.com
3.1. 5. Mechanical Efficiency
The mechanical efficiency of the fuel blends is in general very close to that of diesel.
The improved quality of spray, high reaction activity in the fuel rich zone and
decreases in heat loss due to lower flame temperature will be the cause for efficiency
increases. Mechanical efficiency increases with increasing BP for biodiesel blends
and mixtures.
3.2 Emission Analysis
3.2.1 CO Emission
The formation of CO emission mainly depends upon the physical and chemical
properties of the fuel used. But when compared with diesel CO emission is much
lower for biodiesel mixture due to additional availability of oxygen, so complete
combustion take place.
Figure 6 CO emission Vs BP Figure 7 HC emission Vs BP
3.2.2 HC Emission
It can be observed that HC emissions decrease with increase in blend proportion at a
constant load. The HC emission of the B20 biodiesel and biodiesel additive is less
than that of diesel fuel due to inherent presence of oxygen in the molecular structure
of the jatropha biodiesel.
Figure 8 CO2 emission Vs Brake Power Figure 9 NOx emission Vs Brake Power
3.2.3 CO2 Emission
In “Fig 8” the higher CO2 emission in the exhaust of internal combustion engine is
indication of better combustion of fuel. CO2 emission of jatropha biodiesel and
Biju Cherian Abraham and Albin John Thomas
http://www.iaeme.com/IJMET/index.asp 124 editor@iaeme.com
biodiesel mixture is higher than that of diesel fuel due to complete combustion of fuel
taking place because of the extra availability of oxygen.
3.9. NOx Emission
NOx emission increases with brake power for all the fuels. Since the formation of
NOx is very sensitive to temperature, these higher loads promote cylinder charge
temperature, which is responsible for thermal NOx formation. The additive reduces
the mean temperature inside the combustion chamber thereby reducing NOx emission
for B20+additive mixture.
4. CONCLUSION
During the present investigation several tests were carried out on a four stroke single
cylinder vertical water cooled direct injection diesel engine using diesel, jatropha
biodiesel and jatropha biodiesel with additives. From the experiment the following
conclusions were drawn.
Peak cylinder pressure is lower for biodiesel mixtures at higher and lower loads
due to decrease in delay period. Another reason may be the lower calorific value of
the biodiesel mixture.
Brake thermal efficiency for biodiesel mixture is higher than diesel and B20 due
to better combustion and better lubricity of biodiesel.
SFC is high for biodiesel due to its lower calorific value. More amount of
biodiesel has to be burnt to produce the same power.
Biodiesel mixture has higher mechanical efficiency due to improved quality of
spray, high reaction activity in the fuel rich zone and decreases in heat loss due to
lower flame temperature.
CO and HC emission is lower and CO2 emission is higher for biodiesel mixture
because it contains extra amount of oxygen from the additive DEE for complete
combustion of fuel.
NOx emission is high for B20 due to its high oxygen content and temperature,
where as it is low for B20+additive DEE because of the low cylinder temperature.
REFERENCES
[1] Lin Lin, Zhou Cunshan, Saritporn Vittayapadung, Shen Xiangqian, Dong
Mingdong Opportunities and challenges for biodiesel fuel, Applied Energy 88
(2011), pp 1020–1031
[2] Ayhan Demirbas, Biodiesel from oilgae, biofixation of carbon dioxide by
microalgae: A solution to pollution problems Applied Energy 88 (2011) pp
3541–3547.
[3] K. Srithar, K. Arun Balasubramanian, V. Pavendan, B. Ashok Kumar,
Experimental investigations on mixing of two biodiesels blended with diesel as
alternative fuel for diesel engines, Journal of King Saud University – Engineering
Sciences (2014) pp. 233-240
[4] S.M. Ashrafur Rahman, H.H. Masjuki, M.A. Kalam, M.J. Abedin, A. Sanjid, Md.
Mofijur Rahman, Assessing idling effects on a compression ignition engine fueled
with Jatropha and Palm biodiesel blends, Renewable Energy 68 (2014) pp.644-
650
Performance Evaluation of Biodiesel with A Combustion Enhancer Additive
http://www.iaeme.com/IJMET/index.asp 125 editor@iaeme.com
[5] Hifjur Raheman, Sweeti Kumari, Combustion characteristics and emissions of a
compression ignition engine using emulsified jatropha biodiesel blend,
biosystems engineering 123 ( 2014 ) pp.29 -39
[6] A.Javidialesaadi and S. Raeissi Biodiesel Production from High Free Fatty Acid-
Content Oils: Experimental Investigation of the Pretreatment Step ICESD 2013:
January 19-20, Dubai, UAE, APCBEE Procedia 5 (2013) pp.474 – 478.
[7] Swarup Kumar Nayak, Bhabani Prasanna Pattanaik, Experimental Investigation
on Performance and Emission Characteristics of a Diesel Engine Fuelled with
Mahua Biodiesel Using Additive 4th International Conference on Advances in
Energy Research 2013, ICAER 2013, Energy Procedia 54 ( 2014 ) pp.569 – 579.
[8] Kian Hee Kay, Suhaimi Md Yasir Biodiesel Production from Low Quality Crude
Jatropha Oil Using Heterogeneous Catalyst, ICCCP 2012: 5-6 May 2012, Kuala
Lumpur, Malaysia, APCBEE Procedia 3 ( 2012 ) pp.23 – 27.
[9] Yun-Duo Long, Zhen Fang, Tong-Chao Su, Qing Yang Co-production of
biodiesel and hydrogen from rapeseed and Jatropha oils with sodium silicate and
Ni catalysts, Applied Energy 113 (2014) pp.1819–1825.
[10] Biju Cherian Abraham, Georgekutty S M, Dr. Shajan Kuriakose, Biodiesel
Production From Rubber Seed Oil And Testing In A Twin Cylinder Direct
Injection Diesel Engine, International Journal of Engineering Research &
Technology 2 (6), June – 2013.
[11] Rajan Kumar, Dr. Manoj K Mishra and Dr. Shyam K Singh, Performance and
Emission Study of Jatropha Biodiesel and Its Blends on C.I. Engine.
International Journal of Mechanical Engineering and Technology, 4(3), 2013,
pp. 85 - 93.
[12] Manu Ravuri, D. Harsha Vardhan, V. Ajay and M. Rajasekharreddy,
Experimental Investigations and Comparison of Di Diesel Engine Working on
Jatropha Bio-Diesel And Jatropha Crude Oil. International Journal of
Mechanical Engineering and Technology, 4(3), 2013, pp. 24 - 31.

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Ijmet 06 08_011

  • 1. http://www.iaeme.com/IJMET/index.asp 118 editor@iaeme.com International Journal of Mechanical Engineering and Technology (IJMET) Volume 6, Issue 8, Aug 2015, pp. 118-125, Article ID: IJMET_06_08_011 Available online at http://www.iaeme.com/IJMET/issues.asp?JTypeIJMET&VType=6&IType=8 ISSN Print: 0976-6340 and ISSN Online: 0976-6359 © IAEME Publication ________________________________________________________________________ PERFORMANCE EVALUATION OF BIODIESEL WITH A COMBUSTION ENHANCER ADDITIVE Biju Cherian Abraham Assistant Professor, Dept. of Mechanical Engineering, Mar Athanasius College of Engineering, Kothamangalam, Kerala, India Albin John Thomas M Tech Scholar, Dept. of Mechanical Engineering, Mar Athanasius college of Engineering, Kothamangalam, Kerala, India ABSTRACT The major part of all energy consumed worldwide comes from fossil sources (petroleum, coal and natural gas). However, these sources are limited, and will be exhausted by the near future. Recently, environmental degradation and the exhaustion of fossil fuels have increased the amount of research about alter-native fuels. Thus, looking for alternative sources of new and renewable energy such as hydro, biomass, wind, solar, geothermal, hydrogen and nuclear is of vital importance. Alternative new and renewable fuels have the potential to solve many of the current social problems and concerns, from air pollution and global warming to other environmental improvements and sustainability issues. In recent years, much research has been carried to find suitable alternative fuel to petroleum products. In recent times, the world is confronted with the twin crisis of fossil fuel depletion and environmental degradations. The situations have led to the search for an alternative fuel which should be not only sustainable but also environment friendly without sacrificing the performance. The different sources for alternative fuels are edible- and non-edible vegetable oils, animal fats and waste oil (triglycerides).Vegetable oils, being renewable, are widely available from variety of sources have low sulfur contents close to zero and hence cause less environmental damage (lower greenhouse effect) than diesel. In this research an alternative fuel blend consisting of 80% diesel, 20% jatropha and 5% DEE by volume is used. Performance tests are carried out for this blend at compression ratios of 16, 17 and 18, and it is found out that at a compression ratio of 18 the fuel blend has the best performance. This fuel blend is compared with normal diesel and another blend of 80% diesel and 20%
  • 2. Performance Evaluation of Biodiesel with A Combustion Enhancer Additive http://www.iaeme.com/IJMET/index.asp 119 editor@iaeme.com jatropha at 18CR.All these fuel combinations are compared with each other and final conclusions are made. Keywords: Biodiesel, Die Ethyl Ether, Jatropha Diesel Blend Cite this Article: Biju Cherian Abraham and Albin John Thomas, Performance Evaluation Of Biodiesel with A Combustion Enhancer Additive. International Journal of Mechanical Engineering and Technology, 6(8), 2015, pp. 118-125. http://www.iaeme.com/currentissue.asp?JType=IJMET&VType=6&IType=8 _______________________________________________________________ 1. INTRODUCTION Over the last century, there has been more than 20 fold increase in the consumption of energy worldwide and the availability of energy resource plays a critical role in the progress of a nation. Almost all the human energy needs are currently met from the fast depleting fossil fuels associated with serious environmental consequences. So it is important to look for eco-friendly and infinite renewable sources like solar, wind, hydro and biomass. The ethanol and biodiesel are the two liquid bio fuels that can replace/substitute gasoline /diesel respectively. The non edible seed plant like jatropha, pongamia, mahua etc are being considered as indigenous source of oil for the production of biodiesel. The oil from these plants can be transesterified by suitable method depending on its FFA content for the production of biodiesel that can be used to operate a CI engine. Biodiesel is considered a ‘‘drop-in’’ fuel for combustion systems operating on conventional diesel fuel. It is renewable, biodegradable, non-toxic, and has properties similar to diesel fuel; however, it does not have sulfur and aromatics in its composition. As a clean, biodegradable and renewable fuel, biodiesel is attracting great interest in engine community. Once the oil resources for the production of biodiesel starts to available in the country, the availability of biodiesel as substitute of diesel fuel will increase and dependency on oil import would reduce there by making the country self sufficient in fuel supplies. Recently, environmental degradation and the exhaustion of fossil fuels have increased the amount of research about biodiesel fuels. The main problems associated with the production of biodiesel are its environmental and social impacts such as food security, land change and water source. So in order increase the production and usage of biodiesel it is important to give public awareness about the lack of fossil fuels and the benefits of biodiesel over it. It is important that the government should take necessary steps to promote the farming, production and usage of biodiesel [1]. There are several methods for the production of biodiesel, Dilution, micro-emulsification, pyrolysis and transesterification are the four major techniques used presently. One of the main problems encountered in biodiesel usage is its high viscosity. It can be avoided by the transesterfication of triglycerides by methanol, ethanol, propanol and butanol, hence produced fuel have low viscosity [2]. Large numbers of studies were conducted to find out a suitable combination of biodiesel mixtures which has improved performance characteristics and emission values than diesel. Nowadays studies are more focused on the usage of duel fuels, the brake thermal efficiency of blends was found higher than diesel. The emissions of smoke, hydro carbon and nitrogen oxides of dual biodiesel blends were higher than that of diesel. But the exhaust gas temperature for dual biodiesel blends was found to be lower than diesel[3].When Jatropha and Palm biodiesel blends are used as the fuel in diesel engine at idling
  • 3. Biju Cherian Abraham and Albin John Thomas http://www.iaeme.com/IJMET/index.asp 120 editor@iaeme.com conditions it is found that HC & CO emission decreases and NOx emission increases compared to pure diesel fuel[4].Nowadays emulsified fuels are also used for conducting the experiments, when 10% biodiesel blend is emulsified using water upto 15% by volume and tested it is found that with increasing percentage of water, ignition delay was longer at higher engine loads. Also reductions in emission of CO, CO2, HC & NOx were observed for the emulsified fuel [5]. In this paper a comparison study between the fossil fuel and biodiesel fuel blend is explained. A biodiesel fuel blend consisting of 80% diesel 20% jatropha biodiesel and 5% die ethyl ether(B20+additive) is mixed and the performance is evaluated at the compression ratios of 16,17 and 18.It is found out that at a compression ratio of 18 this biodiesel blend have the maximum performance. So at a compression ratio of 18CR the performance and emission readings of normal diesel, a blend consisting of 80% diesel and 20% jatropha biodiesel(B20) and the B20+Additive mixture is taken and the comparison between them is done. 2. MATERIALS AND METHODS 2.1. Biodiesel Biodiesel is produced from vegetable oils or animal fats and an alcohol, through a transesterification reaction. This chemical reaction converts an ester (vegetable oil or animal fat) into a mixture of esters of the fatty acids that makes up the oil (or fat). Biodiesel is obtained from the purification of the mixture of fatty acid methyl esters (FAME). A catalyst is used to accelerate the reaction. According to the catalyst used, transesterification can be basic, acidic or enzymatic, the former being the most frequently used. Biodiesel is biodegradable, nontoxic, and essentially free of sulfur and aromatics. Biodiesel is considered a renewable resource due to the fact that it is derived from products that can be grown and produced domestically. 2.2. Preparation of test fuel blends Various test fuel blends were prepared by blending Jatropha biodiesel with additive and diesel in various volume proportions. In present study 20% Jatropha biodiesel is mixed with 80% diesel to make the B20 mixture. For preparing the B20+Additve mixture 20% jatropha biodiesel, 80% diesel is mixed initially and as an additive di- ethyl ether is added. The quantity of DEE is 5% of the total volume of B20 mixture. 2.3. The Test Engine The experimental test rig consists of a variable compression ratio compression ignition engine, eddy current dynamometer as loading system, fuel supply system for both Diesel oil supply and biodiesel supply, water cooling system, lubrication system and various sensors and instruments integrated with computerized data acquisition system for online measurement of load, air and fuel flow rate, instantaneous cylinder pressure, injection pressure, position of crank angle and exhaust emissions. 2.4. Experimental procedure The experimental study was carried out to investigate the performance and emission characteristics of a direct injection diesel engine with Jatropha biodiesel using additive and comparing it with that of diesel. The biodiesel, diesel and additives are mixed in desired proportions for getting the test fuels B20 and B20+Additive.The engine opted for this experiment has the capability of running in duel fuel and
  • 4. Performance Evaluation of Biodiesel with A Combustion Enhancer Additive http://www.iaeme.com/IJMET/index.asp 121 editor@iaeme.com different compression ratios. Technical specification of diesel engine is elaborated in the below table1. The diesel engine was initially started with diesel and then with the prepared test fuels. Speed of the engine was kept constant at 1500 rpm under varying load conditions to measure the performance parameters such as brake power, brake thermal efficiency, brake specific fuel consumption and exhaust gas temperature and also to measure the emission parameters like carbon monoxide, un-burnt hydrocarbon, carbon dioxide and nitrogen oxide emissions for both diesel and the prepared test fuels with the help of multi gas analyzer. Table 1 Engine specification Engine specification Make Legion Brothers No. of Cylinder Single Cubic Capacity 553cc Cooling Water Fuel Diesel Speed 1400-1500 rpm HP 5 HP Starting Crank Lubrication Forced 3. RESULTS AND DISCUSSION The performance characteristics of 3 proportions of the fuel such as diesel, B20 and B20+Additive have been evaluated and the following observations were found out. 3.1 Performance Analysis 3.1.1 Average cylinder pressure Figure: 1. Average cylinder pressure Vs Crank Angle at 0kg and 9kg load The peak cylinder pressure depends on the burned fuel fraction during the premixed burning phase i.e. the initial stage of combustion. In spite of the slightly higher viscosity and lower volatility of the biodiesel, the ignition delay seems to be lower than diesel. This may possibly be because a complex and rapid pre-flame chemical reaction takes place at high temperatures. The use of DEE has decreased the ignition delay of biodiesel mixture.
  • 5. Biju Cherian Abraham and Albin John Thomas http://www.iaeme.com/IJMET/index.asp 122 editor@iaeme.com 3.1.2 Brake Thermal Efficiency Figure 2 Brake Thermal Efficiency Vs BP Figure 3 SFC Vs BP At lower brake powers the BTE of biodiesel blend and biodiesel mixtures are same as that of diesel fuel. It is seen that at higher loads the BTE is higher for biodiesel blends and biodiesel mixtures. The reasons for this improvement of Brake thermal efficiency is better combustion and better lubricity of biodiesel. The use of the additive DEE in biodiesel mixture has improved the oxygen content of the fuel which in turn increases the brake thermal efficiency. 3.1.3 Specific fuel consumption SFC is an important parameter that reflects how good the engine performance is. It is seen that at lower loads biodiesel blend has higher SFC value due to lower calorific value of biodiesel. As the brake power increases specific fuel consumption is lower due to complete combustion of fuel taking place. Figure 4 Volumetric Efficiency Vs BP Figure 5 Mechanical Efficiency Vs BP 3.1.4. Volumetric Efficiency In fig.4 the volumetric efficiency of the diesel engine mainly depends upon the combustion chamber temperature. The increase in the chamber temperature increases the intake air temperature and consequently reduces the mass of air drawn in each cycle thereby decreasing the efficiency. Biodiesel mixture has higher volumetric efficiency when compared to biodiesel additive. The reason may be that DEE in biodiesel mixture has a tendency to decreases the combustion temperature and increases the oxygen content.
  • 6. Performance Evaluation of Biodiesel with A Combustion Enhancer Additive http://www.iaeme.com/IJMET/index.asp 123 editor@iaeme.com 3.1. 5. Mechanical Efficiency The mechanical efficiency of the fuel blends is in general very close to that of diesel. The improved quality of spray, high reaction activity in the fuel rich zone and decreases in heat loss due to lower flame temperature will be the cause for efficiency increases. Mechanical efficiency increases with increasing BP for biodiesel blends and mixtures. 3.2 Emission Analysis 3.2.1 CO Emission The formation of CO emission mainly depends upon the physical and chemical properties of the fuel used. But when compared with diesel CO emission is much lower for biodiesel mixture due to additional availability of oxygen, so complete combustion take place. Figure 6 CO emission Vs BP Figure 7 HC emission Vs BP 3.2.2 HC Emission It can be observed that HC emissions decrease with increase in blend proportion at a constant load. The HC emission of the B20 biodiesel and biodiesel additive is less than that of diesel fuel due to inherent presence of oxygen in the molecular structure of the jatropha biodiesel. Figure 8 CO2 emission Vs Brake Power Figure 9 NOx emission Vs Brake Power 3.2.3 CO2 Emission In “Fig 8” the higher CO2 emission in the exhaust of internal combustion engine is indication of better combustion of fuel. CO2 emission of jatropha biodiesel and
  • 7. Biju Cherian Abraham and Albin John Thomas http://www.iaeme.com/IJMET/index.asp 124 editor@iaeme.com biodiesel mixture is higher than that of diesel fuel due to complete combustion of fuel taking place because of the extra availability of oxygen. 3.9. NOx Emission NOx emission increases with brake power for all the fuels. Since the formation of NOx is very sensitive to temperature, these higher loads promote cylinder charge temperature, which is responsible for thermal NOx formation. The additive reduces the mean temperature inside the combustion chamber thereby reducing NOx emission for B20+additive mixture. 4. CONCLUSION During the present investigation several tests were carried out on a four stroke single cylinder vertical water cooled direct injection diesel engine using diesel, jatropha biodiesel and jatropha biodiesel with additives. From the experiment the following conclusions were drawn. Peak cylinder pressure is lower for biodiesel mixtures at higher and lower loads due to decrease in delay period. Another reason may be the lower calorific value of the biodiesel mixture. Brake thermal efficiency for biodiesel mixture is higher than diesel and B20 due to better combustion and better lubricity of biodiesel. SFC is high for biodiesel due to its lower calorific value. More amount of biodiesel has to be burnt to produce the same power. Biodiesel mixture has higher mechanical efficiency due to improved quality of spray, high reaction activity in the fuel rich zone and decreases in heat loss due to lower flame temperature. CO and HC emission is lower and CO2 emission is higher for biodiesel mixture because it contains extra amount of oxygen from the additive DEE for complete combustion of fuel. NOx emission is high for B20 due to its high oxygen content and temperature, where as it is low for B20+additive DEE because of the low cylinder temperature. REFERENCES [1] Lin Lin, Zhou Cunshan, Saritporn Vittayapadung, Shen Xiangqian, Dong Mingdong Opportunities and challenges for biodiesel fuel, Applied Energy 88 (2011), pp 1020–1031 [2] Ayhan Demirbas, Biodiesel from oilgae, biofixation of carbon dioxide by microalgae: A solution to pollution problems Applied Energy 88 (2011) pp 3541–3547. [3] K. Srithar, K. Arun Balasubramanian, V. Pavendan, B. Ashok Kumar, Experimental investigations on mixing of two biodiesels blended with diesel as alternative fuel for diesel engines, Journal of King Saud University – Engineering Sciences (2014) pp. 233-240 [4] S.M. Ashrafur Rahman, H.H. Masjuki, M.A. Kalam, M.J. Abedin, A. Sanjid, Md. Mofijur Rahman, Assessing idling effects on a compression ignition engine fueled with Jatropha and Palm biodiesel blends, Renewable Energy 68 (2014) pp.644- 650
  • 8. Performance Evaluation of Biodiesel with A Combustion Enhancer Additive http://www.iaeme.com/IJMET/index.asp 125 editor@iaeme.com [5] Hifjur Raheman, Sweeti Kumari, Combustion characteristics and emissions of a compression ignition engine using emulsified jatropha biodiesel blend, biosystems engineering 123 ( 2014 ) pp.29 -39 [6] A.Javidialesaadi and S. Raeissi Biodiesel Production from High Free Fatty Acid- Content Oils: Experimental Investigation of the Pretreatment Step ICESD 2013: January 19-20, Dubai, UAE, APCBEE Procedia 5 (2013) pp.474 – 478. [7] Swarup Kumar Nayak, Bhabani Prasanna Pattanaik, Experimental Investigation on Performance and Emission Characteristics of a Diesel Engine Fuelled with Mahua Biodiesel Using Additive 4th International Conference on Advances in Energy Research 2013, ICAER 2013, Energy Procedia 54 ( 2014 ) pp.569 – 579. [8] Kian Hee Kay, Suhaimi Md Yasir Biodiesel Production from Low Quality Crude Jatropha Oil Using Heterogeneous Catalyst, ICCCP 2012: 5-6 May 2012, Kuala Lumpur, Malaysia, APCBEE Procedia 3 ( 2012 ) pp.23 – 27. [9] Yun-Duo Long, Zhen Fang, Tong-Chao Su, Qing Yang Co-production of biodiesel and hydrogen from rapeseed and Jatropha oils with sodium silicate and Ni catalysts, Applied Energy 113 (2014) pp.1819–1825. [10] Biju Cherian Abraham, Georgekutty S M, Dr. Shajan Kuriakose, Biodiesel Production From Rubber Seed Oil And Testing In A Twin Cylinder Direct Injection Diesel Engine, International Journal of Engineering Research & Technology 2 (6), June – 2013. [11] Rajan Kumar, Dr. Manoj K Mishra and Dr. Shyam K Singh, Performance and Emission Study of Jatropha Biodiesel and Its Blends on C.I. Engine. International Journal of Mechanical Engineering and Technology, 4(3), 2013, pp. 85 - 93. [12] Manu Ravuri, D. Harsha Vardhan, V. Ajay and M. Rajasekharreddy, Experimental Investigations and Comparison of Di Diesel Engine Working on Jatropha Bio-Diesel And Jatropha Crude Oil. International Journal of Mechanical Engineering and Technology, 4(3), 2013, pp. 24 - 31.