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Swirl distortion at the compressor face is

  • A.A temperature variation
  • B.A circumferential velocity component
  • C.A radial variation in total pressure
  • D.An axial velocity variation

Answer: B

Swirl changes the incidence on the first rotor row directly, either loading or unloading it depending on its direction. Modern intake assessments treat it alongside pressure distortion because either can trigger a surge on its own.

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