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Compression Mach waves generated by a concave surface tend to

  • A.Reflect back into the surface
  • B.Converge and coalesce into an oblique shock
  • C.Diverge and weaken indefinitely
  • D.Remain parallel

Answer: B

Each successive compression wave sits in slower flow and so lies at a larger Mach angle, so the characteristics converge. Where they cross, they merge into a shock. This is the mirror image of the expansion case and explains why compressions are concentrated while expansions are spread.

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