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Which statement about stagnation properties is FALSE?

  • A.Stagnation temperature measures the total energy of the stream
  • B.Stagnation pressure is conserved in isentropic flow
  • C.Stagnation pressure is conserved across a normal shock
  • D.Stagnation temperature is conserved across a normal shock

Answer: C

Stagnation pressure is destroyed by the entropy rise across a shock, typically losing tens of per cent for a strong one. The other three statements are all correct, and the contrast between the two stagnation quantities across a shock is one of the most heavily examined points in the subject.

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