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Which of the following is NOT a consequence of a flow being supersonic?

  • A.Shock waves may form
  • B.Pressure disturbances can propagate upstream to influence the oncoming flow
  • C.Weak disturbances are confined within a Mach cone
  • D.A converging duct decelerates the flow

Answer: B

In supersonic flow the gas outruns its own pressure signals, so nothing can propagate upstream; that is the defining feature of the regime and the reason choked nozzles are insensitive to back pressure. The other three all follow from it directly.

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