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Degree of reaction of a compressor stage is the ratio of

  • A.Static enthalpy rise in the rotor to that in the whole stage
  • B.Total pressure rise to static pressure rise
  • C.Rotor work to stator work
  • D.Blade speed to axial velocity

Answer: A

A fifty per cent reaction stage divides the static pressure rise equally between rotor and stator, which makes their velocity triangles mirror images. That symmetry is efficient and lets one blade profile serve both rows, which is why it is so common in practice.

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