Question 38Gas Turbine - Assistant Engineer
70% to passBefore combustion can occur, the combustion air must be delivered to the combustor at a high-pressure and low-velocity. High-velocity, low-pressure air is converted to high- pressure, low-velocity air at what part of a centrifugal type compressor?
AInlet plenum.
BDiffuser.
CTurning vanes.
DImpeller.
AI Explanation
The correct answer is B) Diffuser. In a centrifugal type compressor, the high-velocity, low-pressure air leaving the impeller is converted to high-pressure, low-velocity air in the diffuser section. The diffuser is a diverging passage that gradually decelerates the air flow, converting the kinetic energy into static pressure. The other options are incorrect because: A) The inlet plenum is where the air enters the compressor, before it reaches the impeller. C) The turning vanes are used to redirect the air flow, but do not convert the velocity and pressure. D) The impeller is responsible for accelerating the air, not decelerating it.
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