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The coefficient of discharge of a nozzle compares

  • A.Actual mass flow with the ideal mass flow for the same conditions
  • B.Actual exit velocity with the ideal velocity
  • C.Actual thrust with ideal thrust
  • D.Exit area with throat area

Answer: A

Boundary layers reduce the effective flow area below the geometric one, so the actual mass flow falls a little short. Values above 0.98 are typical, and the shortfall is accounted for when the nozzle area is sized during development.

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