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Which of the following would NOT reduce the stagnation pressure loss in a supersonic intake?

  • A.Adding a further oblique shock before the terminal normal shock
  • B.Reducing the strength of the terminal normal shock
  • C.Using an external compression ramp ahead of the cowl
  • D.Replacing several oblique shocks with a single strong normal shock

Answer: D

Concentrating the whole compression into one strong normal shock maximises the entropy rise and so the loss, which is the opposite of what is wanted. The other three all spread the compression over weaker waves, and since the loss grows as the cube of shock strength, that is a substantial saving.

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