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An expansion fan crossing an oblique shock

  • A.Reflects entirely off the shock
  • B.Passes through with no interaction at all
  • C.Weakens the shock and is itself refracted
  • D.Strengthens the shock

Answer: C

The two waves interact: the expansion reduces the pressure ratio the shock has to sustain and so weakens it, while the shock refracts the characteristics of the fan. This is why the trailing-edge shocks of a supersonic aerofoil are weakened by the expansion coming off the surface ahead of them.

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