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A flow is described as transonic when

  • A.The flow is everywhere below Mach 0.3
  • B.Regions of subsonic and supersonic flow coexist in the same field
  • C.The free-stream Mach number is exactly one everywhere
  • D.The Mach number exceeds five

Answer: B

Transonic flow is the awkward mixed regime, typically between about Mach 0.8 and 1.2 in the free stream, in which the flow accelerates past sonic speed somewhere on the body while remaining subsonic elsewhere. The mixed character is what makes it so hard to compute and why shock-induced separation appears there.

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