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Increasing jet velocity is a good way to reduce jet noise. Is this correct?

  • A.No, noise power rises with roughly the eighth power of velocity
  • B.Yes, faster jets mix more smoothly
  • C.Yes, provided the nozzle has chevrons
  • D.No, because velocity does not affect noise

Answer: A

Noise is generated by turbulent mixing in the shear layer and rises extraordinarily steeply with velocity. That relationship is why the industry's most effective noise measure was raising bypass ratio to lower the jet velocity.

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