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A characteristic, or Mach line, in a steady supersonic flow is a line along which

  • A.Disturbances propagate at the local Mach angle
  • B.The pressure is always constant
  • C.The flow direction is normal to the surface
  • D.The entropy is always zero

Answer: A

Characteristics are the paths along which information travels in a supersonic flow, inclined at the local Mach angle to the local flow direction. There are two families, one running to each side, and the method of characteristics uses them to march a solution through the flow field.

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