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A designer proposes an intake that compresses the flow with no stagnation pressure loss by using very weak shocks. The proposal is

  • A.Achievable if enough shocks are used
  • B.Achievable at low supersonic Mach numbers only
  • C.Achievable if the shocks are all oblique
  • D.Unachievable in principle, since any finite shock raises entropy

Answer: D

The loss can be made small by splitting the compression among many weak waves, and real intakes push hard in that direction, but it cannot be made zero. Every shock of finite strength raises entropy, and only a wave of vanishing strength, which performs no compression, is isentropic.

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