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The Prandtl-Meyer function gives

  • A.The turning needed to expand sonic flow to a given Mach number
  • B.The angle of the shock produced by a given deflection
  • C.The stagnation pressure loss across an expansion
  • D.The entropy rise through a fan

Answer: A

The function is defined so that it is zero at Mach one and increases with Mach number. Its value at any Mach number is the total turning needed to expand a sonic stream up to that speed, which is what makes turning angles simply additive in it.

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