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A fifty per cent reaction turbine stage divides the

  • A.Static enthalpy drop equally between the vanes and the rotor
  • B.Mass flow equally between two rows
  • C.Cooling air equally between vanes and blades
  • D.Work equally between two stages

Answer: A

The equal division makes the velocity triangles mirror images and lets a similar profile serve both rows. It is aerodynamically the most efficient arrangement, which is why most modern turbines are designed close to it at the mean radius.

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