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On a flat plate at incidence in supersonic flow, the upper surface carries

  • A.An oblique shock at the leading edge and an expansion at the trailing edge
  • B.Expansion fans at both edges
  • C.Oblique shocks at both edges
  • D.An expansion fan at the leading edge and an oblique shock at the trailing edge

Answer: D

The flow must turn away from itself to follow the upper surface, giving a leading-edge expansion, and must be turned back to the free-stream direction at the trailing edge, giving a shock. The lower surface is the mirror image, with a leading-edge shock and a trailing-edge expansion.

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