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An underexpanded nozzle is one whose exit pressure is

  • A.Zero
  • B.Above the ambient pressure
  • C.Below the ambient pressure
  • D.Exactly equal to the ambient pressure

Answer: B

If the gas leaves still above ambient pressure it must continue to expand once free of the nozzle, and it does so through expansion fans springing from the lip. Those fans reflect off the constant-pressure plume boundary as compressions, and the resulting pattern is the familiar train of shock diamonds.

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