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A flow at Mach 1 is turned through 130.45 degrees round a convex corner. At the end of the turn

  • A.The stagnation pressure has fallen to zero
  • B.The pressure has fallen to zero
  • C.The flow has returned to Mach 1
  • D.A shock has formed

Answer: B

That angle is the maximum value of the Prandtl-Meyer function for air, reached as the Mach number grows without bound and the static pressure tends to zero. The stagnation pressure is untouched throughout, since the process remains isentropic; it is the static pressure that vanishes.

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