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A supersonic flow turning round a convex corner expands through

  • A.A centred fan of Mach waves
  • B.A single oblique shock
  • C.A normal shock
  • D.A slip line

Answer: A

The turning is spread over an infinite number of vanishingly weak Mach waves radiating from the corner, which together form a centred Prandtl-Meyer fan. It cannot be concentrated into a single front, because an expansion discontinuity would require the entropy of the gas to fall.

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