In an axial flow compressor stage, aerodynamic stall of rotor blades that propagates circumferentially from blade to blade is known as:

(A) Rotating stall

(B) Compressor surge

(C) Choking flutter

(D) Diffuser resonance

Answer Key:

A

### Solution: Rotating stall is a local aerodynamic instability where stall cells propagate circumferentially around the compressor annulus at roughly 30-50% of rotor speed. Correct: A.

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