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Which of these is NOT a reason expansions and compressions behave asymmetrically in supersonic flow?

  • A.The two are governed by different conservation laws
  • B.Compression characteristics converge while expansion characteristics diverge
  • C.A discontinuous expansion would violate the second law
  • D.The Mach angle grows as flow decelerates and shrinks as it accelerates

Answer: A

Both processes obey exactly the same conservation laws; nothing in mass, momentum or energy distinguishes them. The asymmetry comes entirely from the entropy condition and from the way the Mach angle varies, which the other three options state.

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