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Flow is described as transonic when

  • A.Regions of both subsonic and supersonic flow exist together
  • B.The flow is subsonic everywhere in the field
  • C.The flow is supersonic everywhere in the field
  • D.The Mach number exceeds five throughout the field

Answer: A

Near a free-stream Mach number of one, local acceleration over a wing can carry part of the flow past the speed of sound while the rest remains subsonic, and shock waves appear where it returns. This mixed condition is the hardest regime to analyse or to design for.

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