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As a flow passes through an expansion fan, the fan itself

  • A.Diverges, as the Mach angle falls
  • B.Converges, because the Mach angle rises
  • C.Has parallel bounding characteristics
  • D.Collapses to a single line

Answer: A

The characteristics fan out because each successive Mach wave sits in faster flow and so lies at a smaller angle. This divergence is the geometric expression of the expansion being spread out, and it contrasts with a compression corner, where converging characteristics coalesce into a shock.

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