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Velocity triangles at a compressor stage relate

  • A.Efficiency and rotational speed
  • B.Absolute velocity, relative velocity and blade speed
  • C.Static and total pressure
  • D.Mass flow and pressure ratio

Answer: B

The absolute velocity seen from the casing and the relative velocity seen from the rotating blade differ by the blade speed, and drawing that vector relation is the whole of stage kinematics. Every quantity in the Euler equation is read directly off those triangles.

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