Turbine Block 13 Practice Exam

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In the compressor section of an axial-flow engine, what is the primary effect of the stator vanes?

Increase velocity

Decrease velocity and increase pressure

Decrease velocity, increase pressure and prevent swirling

The stator vanes are fixed blades placed between rotor stages that straighten and slow the flow coming off the previous rotor. The rotor imparts a swirl and kinetic energy to the air, and the stator removes that swirling motion by redirecting the flow to align with the engine axis. By decelerating the flow, the dynamic pressure is converted into static pressure, increasing the air pressure before it enters the next stage. So the stator’s primary effect is to decrease velocity, increase pressure, and prevent swirl.

Prevent swirl only

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