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The primary function of an engine inlet is to

  • A.Decelerate the incoming air and raise its static pressure
  • B.Accelerate the air before the compressor
  • C.Add heat to the incoming air
  • D.Remove moisture from the air

Answer: A

The compressor needs air delivered at a modest and uniform axial Mach number, typically around 0.4 to 0.5, whatever the flight speed happens to be. Converting velocity into static pressure ahead of the first stage is free compression the engine does not have to pay for.

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