What is the primary function of the turbine section?

• A. Transforms part of the exhaust gas energy into mechanical energy to drive the compressor and accessories
• B. Directs the flow of hot gases leaving the turbine
• C. Pumps fuel to the combustor
• D. Provides structural support

Answer: (A)

The turbine section exists to take energy from the hot, high-pressure exhaust gases and convert part of that energy into mechanical work to drive the compressor and other accessories. As the gases expand through the turbine blades, they transfer energy to the shaft, spinning the compressor that draws in air and powers systems like the fuel pumps and generators. If the turbine didn’t extract this energy, the compressor wouldn’t get enough power and the engine couldn’t sustain operation.

Directing the flow of hot gases leaving the turbine is handled by other components such as nozzle guides and casings, not by the turbine’s main purpose. Pumping fuel to the combustor and providing structural support are functions of the fuel system and the engine frame, respectively, not the primary role of the turbine.