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A supersonic intake using several oblique shocks before a terminal normal shock is preferred because

  • A.The total stagnation pressure loss is much smaller than for a single strong normal shock
  • B.It produces no stagnation pressure loss at all
  • C.It raises the stagnation temperature of the flow
  • D.It removes the need to decelerate the flow

Answer: A

Entropy rise grows very rapidly with shock strength, so several weak shocks cost far less stagnation pressure than one strong one doing the same total compression. The Concorde and the SR-71 intakes both work this way, and the recovered stagnation pressure directly sets the thrust the engine can produce.

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