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A convex corner in a supersonic stream can turn the flow through, at most,

  • A.Ninety degrees
  • B.The Mach angle
  • C.An unlimited angle
  • D.The angle at which pressure reaches zero

Answer: D

Expansion is limited by the pressure falling to zero, at which point the gas has reached its maximum possible speed and cannot expand further. Turning beyond that leaves a vacuum region between the flow and the surface, so the flow simply separates from the corner.

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