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Across a Prandtl-Meyer expansion, the stagnation pressure

  • A.Falls sharply, as it does across a shock
  • B.Rises with the turning angle
  • C.Falls to zero
  • D.Is unchanged, because the process is isentropic

Answer: D

This is the essential contrast with a shock. Because the expansion generates no entropy, both stagnation pressure and stagnation temperature come through unaltered. A supersonic flow can therefore be expanded and re-compressed with loss occurring only in the compression.

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