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The Prandtl relation for a normal shock states that the product of the upstream and downstream

  • A.Characteristic Mach numbers is unity
  • B.Static pressures is unity
  • C.Static temperatures is unity
  • D.Velocities equals the speed of sound

Answer: A

Written in terms of the characteristic Mach number, the velocity divided by the critical speed of sound, the Prandtl relation says the product across the shock is exactly one. It is a compact statement of the fact that a shock always carries the flow from one side of sonic conditions to the other.

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