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Euler's turbomachinery equation gives the specific work as

  • A.The pressure ratio times the specific heat
  • B.The axial velocity times the blade speed
  • C.The change in static pressure divided by density
  • D.The blade speed times the change in tangential velocity

Answer: D

The relation \( w = U \Delta c_\theta \) says that work depends only on how much the blade turns the flow in the tangential direction. It applies to axial and centrifugal machines alike, which is why it is the natural starting point for any stage analysis.

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