15.6 TURBINE SECTION

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PURPOSE

• To drive the compressor• Absorb a high proportion of energy of gas

stream and converting into torque.

TYPE OF TURBINE1.Impulsive type 2.Reaction type

3.Impulsive/reaction

4. Radial Inflow type

TURBINE ATTACHMENT

High Pressure Attachment

Low Pressure Attachment

BLADE TO DISK ATTACHMENT

COOLING TURBINE BLADE

NOZZLE GUIDE VANE• Direct airflow to turbine blade• Convert pressure energy into kinetic energy• Air flow become spin and swirl

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