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A pitot-static tube used at supersonic speeds must be corrected because

  • A.The stagnation temperature falls across the shock
  • B.A bow shock stands ahead of it and destroys stagnation pressure
  • C.The static ports read the stagnation pressure directly
  • D.The speed of sound becomes independent of temperature

Answer: B

At supersonic speed a detached bow shock forms ahead of the probe, and the entropy rise across it reduces the stagnation pressure that the probe then measures. The Rayleigh pitot formula accounts for this. Stagnation temperature is unaffected, since a shock is adiabatic.

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