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For a flow expanding from Mach number one to Mach number two through a turn of angle theta,

  • A.The turning angle has no relation to the Prandtl-Meyer function
  • B.The Prandtl-Meyer function of the second equals that of the first plus theta
  • C.The Mach numbers themselves differ by theta
  • D.The Prandtl-Meyer function of the second equals that of the first minus theta

Answer: B

Turning angles add directly in the Prandtl-Meyer function, which is precisely why the function is tabulated. Look up the function at the upstream Mach number, add the turn, and read the downstream Mach number back out of the same table. No iteration is needed.

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