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Which statement about the stagnation properties across a shock is TRUE?

  • A.Stagnation temperature is unchanged while stagnation pressure falls
  • B.Stagnation pressure is unchanged while stagnation temperature falls
  • C.Both are unchanged
  • D.Both fall in the same proportion

Answer: A

The shock is adiabatic, so the total energy and with it the stagnation temperature survive, but it is irreversible, so entropy rises and stagnation pressure is destroyed. This asymmetry is the single most examined point about shocks and is worth stating to oneself before attempting any such question.

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