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The leading edge of a centred expansion fan makes an angle with the upstream flow equal to

  • A.The downstream Mach angle
  • B.The turning angle
  • C.Ninety degrees
  • D.The upstream Mach angle

Answer: D

The first characteristic of the fan is a Mach wave in the undisturbed upstream flow, so it lies at the upstream Mach angle. The trailing characteristic lies at the downstream Mach angle to the downstream flow direction, and since the flow has accelerated, that angle is smaller.

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