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Calculating Exhaust Flow Rates

  1. Jan 14, 2015 #1
    Hello everyone,

    I have been trying to calculate some exhaust flow rates for a while, and I am having some issues here. I was wondering if anyone could provide any insight.

    I am making a few assumptions for this calculation. I am assuming no fuel or air is lost through blow by gasses into the crank case or through valve leakage. I am also assuming perfect stoichiometry. In other words...

    Mass in = Mass out
    All the fuel is burned in a perfect ratio of reactants

    I know the mass of the products entering the engine through fuel consumption measurements, and stoichiometry assumptions.

    Since I know the mass of my exhaust gasses all I need to do is determine the density of my exhaust gasses to find the volume.

    What I know -Temperature
    -Chemical composition
    -Pressure
    -Mass

    What I need to know
    -Volume


    Any tips? I want to use the ideal gas law, but I don't know if this would be an appropriate application of it.

    Thanks!

    -Dave
     
  2. jcsd
  3. Jan 14, 2015 #2
    ##\dot{m}=\rho \dot{V}##, where ##\dot{V}## is the volumetric flow rate, ρ is the gas density (from the ideal gas law), and ##\dot{m}## is the mass flow rate.

    Chet
     
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