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