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Stagnation pressure is conserved along a streamline only if the flow is

  • A.Incompressible, whatever the losses
  • B.Adiabatic and reversible, that is isentropic
  • C.Adiabatic, whether reversible or not
  • D.Isothermal

Answer: B

Stagnation pressure survives only when there is no entropy rise, so the flow must be both adiabatic and reversible. Any irreversibility, whether a shock wave, friction or mixing, reduces it. Stagnation temperature, by contrast, needs only the adiabatic condition.

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