7. NOZZLE GUIDE VANE
โข Direct airflow to turbine blade
โข Convert pressure energy into kinetic energy
โข Air flow become spin and swirl
8. BLADE STRESS AND CREEP
โข Creep is due to blade grow in length due to
high temperature and centrifugal force(stress)
โข Stretch of blade occur in 3 stage :
โ 1st stage: rapid extention and decrease
โ 2nd stage : Constant rate of expansion
โ 3rd stage : Rapid extention and failure occur
โข Improve grain structure and properties can
improve service life