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Aerospace Bypass Ratio

  1. Oct 14, 2009 #1
    What Basis Bypass Ratio Has Chosen For Turbofan Engine
  2. jcsd
  3. Oct 14, 2009 #2


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    Bypass ratios range from very small in some applications to very large in others. What do you mean by basis?
  4. Oct 14, 2009 #3


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    It's all dictated by the cycle requirements. There is no quick way to nail it down.
  5. Oct 15, 2009 #4
    if you see bypass ratio varies from 0.1:1>br<1:1 for turbojet engine and 5:1>br<11:1 for turbofan engine.
    Some turbofan engine has bypass ratio CFM 56 2c1 has 6, and CFM 56-5b3/4 has 5.3 and 5.5 has Ge 90 has 8.4 and ge 90-115b has 9 and various ratio. when your check this the thrust range is also varies with bypass ratio. is bypass ratio chosen by thrust or any other parameter.
  6. Dec 14, 2009 #5
    It's chose by flight regime of the engine's intended use. For most commercial applications, high bypass turbofans are more efficient, as the design parameter is simply sustained high sub-mach cruise, with sufficient thrust for one engine-out performance at max gross take-off weight.
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