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A Prandtl-Meyer fan is described as centred when

  • A.It is symmetric about the flow axis
  • B.It lies exactly at the mid-chord of the section
  • C.Its characteristics are parallel
  • D.All its characteristics radiate from a single sharp corner

Answer: D

A sharp corner introduces no length scale, so every characteristic emanates from that one point and the solution is self-similar. Rounding the corner spreads the origins of the waves along the surface, giving a distributed rather than a centred expansion, though the downstream state is the same.

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