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Aerospace Jet Engine Mass Flow Rate calculation

  1. Oct 3, 2009 #1
    hi
    how to find air mass flow rate in jet engine?
    we are using thrust/Isp equation to find the mass flow rate for rocket equation. is that any formula available for finding the mass flow rate in jet engine
     
  2. jcsd
  3. Oct 3, 2009 #2
    You could start with a simple thermodynamic heat balance to get a ballpark figure.

    Do you have any information on the inlet and outlet conditions or intermediate conditions like the compressor outlet to the turbine inlet?

    What is the thrust/Isp equation? Can you post it?

    Thanks
    Matt
     
  4. Oct 3, 2009 #3
    For Rocket,
    Total Mass Flow rate W = F (Thrust) / Isp (Specific Impulse)
    Fuel Mass Flow Rate Wf = W/(r+1)
    Oxygen Mass Flow Rate Wo = W-Wf

    r = fuel - oxygen mixture ratio

    you have asked information about the inlet and outlet conditions or intermediate conditions like the compressor outlet to the turbine inlet.
    Take on example of GE 90 - 110B and GE 90 - 110B1 engine.

    the fuel flow rate for jet engine is calculated by the following equations
    mfuel = Fuel flow rate=mair(f/a)/(B+1)
    f/a=Cpg(To5-To4)/HV

    help to fine the air mass flow rate
     
  5. Oct 4, 2009 #4

    FredGarvin

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