Discussion
Assertion (A): Turbine isentropic efficiency is usually higher than compressor efficiency.
Reason (R): An accelerating flow suffers less from boundary layer growth and separation.
Select the correct answer from the options below.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the cause. In a turbine the flow accelerates through both rows, so the pressure gradient is favourable, the boundary layers stay thin and separation is unlikely. In a compressor the flow is decelerating against an adverse gradient, which thickens the boundary layers and risks separation. Turbine efficiencies of 90 to 92 per cent against compressor efficiencies of 85 to 90 follow directly, and so does the fact that one turbine stage can drive several compressor stages.
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