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Across a normal shock wave in a steady flow, the stagnation temperature

  • A.And the stagnation pressure both remain unchanged
  • B.And the stagnation pressure both rise
  • C.Remains unchanged while the stagnation pressure falls
  • D.Falls while the stagnation pressure remains unchanged

Answer: C

A shock is adiabatic, so the total energy and with it the stagnation temperature are unchanged. It is strongly irreversible, however, so entropy rises and stagnation pressure drops. That loss of stagnation pressure is the real cost of a shock and the reason supersonic intakes are designed to avoid strong ones.

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