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Which of the following is NOT true of an expansion fan?

  • A.It is built from an infinity of Mach waves
  • B.It leaves the stagnation pressure unchanged
  • C.It opens out as the flow passes through it
  • D.It produces a measurable rise in entropy

Answer: D

Each wave in the fan is vanishingly weak, and entropy rise goes as the cube of wave strength, so the total is negligible. That is exactly why the isentropic relations may be carried straight through a fan while they must never be carried through a shock.

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