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In a Prandtl-Meyer expansion, the flow properties depend only on

  • A.The upstream Mach number and the turn
  • B.The turning angle alone
  • C.The upstream pressure alone
  • D.The radius of the corner

Answer: A

The corner is treated as sharp and the fan as centred, so no length scale enters and the solution is self-similar. Everything downstream follows from the upstream Mach number and the angle turned through, which is what makes the Prandtl-Meyer function such an economical piece of bookkeeping.

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