4-Stroke Engines: Comparing Otto & Diesel Cycles Under 40 Characters
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The document discusses four stroke engines, including the intake, compression, ignition/combustion, and exhaust strokes. It compares the processes and sequences of operation in diesel and gasoline engines. Ideal assumptions and real-world factors are outlined. The four main strokes are defined, and the Otto and Diesel thermodynamic cycles are examined through pressure-volume and temperature-pressure diagrams. Finally, gasoline and diesel engines are compared in terms of applications, costs, and efficiencies.
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4-Stroke Engines: Comparing Otto & Diesel Cycles Under 40 Characters
- 1. FOUR STROKE ENGINES strokes(movements of piston from tdc to bdc or either way) corresponding rotation of crank how many during 4 strokes?
- 2. EVENTS & SEQUENCE OF OPERATION DIESEL ENGINE • INTAKE OF AIR • COMPRESSION OF AIR • IGNITION OF FUEL • IGNITION AND COMBUSTION OF CHARGE • EXPANSION OF GASES • REMOVAL OF WASTE GASOLINE ENGINE • INTAKE OF FUEL AND AIR • COMPRESSION OF FUEL AIR MIXTURE • IGNITION AND COMBUSTION OF CHARGE • EXPANSION OF GASES • REMOVAL OF WASTE
- 3. ASSUMPTIONS IDEAL • FIXED AMOUNT OF MASS • COMBUSTION PROCESS IS REPLACED BY HT FROM AN EXTERNAL SOURCE • NO INTAKE OR EXHAUST STROKES • ALL PROCESSES ARE INTERNALLY REVERSIBLE-NO FRICTION OR HEAT LOSS • SPECIFIC HEAT ARE ASSUMED CONSTANT AT THEIR AMBIENT TEMPERATURE VALUES REAL/ACTUAL • CHANGE IN COMPOSITION OF THE GASEOUS CONTENTS INSIDE THE CYLINDER DURING COMBUSTION • CALCULATION OF WORK REQUIRED TO CHARGE THE CYCLINDER & PURGE THE GASES • HEAT TRANSFER CALCULATION B/W GASES AND CYLINDER WALLS • FRICTION LOSSES,PRESSURE AND TEMPERATURE GRADIENTS
- 4. FOUR STROKE ENGINES . BLOW DOWN OPENING OF EXHAUST VALVE DURING EXPANSION . OVERLAP OPENING AND CLOSING OF VALVE . RAM EFFECT ADDITIONAL MASS OF FRESH CHARGE.
- 9. SI ENGINES
- 11. Otto cycle
- 13. DIESEL ENGINES
- 19. 4 STROKE SI ENGINE
- 20. 4 STROKE CI ENGINE
- 21. CONCLUSIVE COMPARISION SI ENGINES • LIGHT WEIGHT • LOW COST • SUITABLE FOR SMALL & MEDIUM SIZED AUTOMOBILES • DOMESTIC ELECTRIC GENERATORS • SAME COMPRESSION RATIO THERMAL EFFICIENCY MORE CI ENGINES • MEDIUM & LARGE SIZED MOBILES- LOCOMOTIVE/TRUCKS • NOISY • CAN USE LESS REFINED FUELS-DUE HIGHER COMPRESSION RATIO
- 22. SI &CI ENGINES -COMPARISION
- 23. SI &CI ENGINES -COMPARISION