Modelling combustion using species transport

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 December 19, 2018, 20:55 Modelling combustion using species transport #1 Member   Anshuman Sinha Join Date: Oct 2018 Posts: 70 Rep Power: 7 I am modelling the combustion reaction of CO gas with Oxygen, using the species transport model. It is a non-premixed type combustion, where the fuel gas ( CO) enters the reactor at 1700K and oxygen enters through a jet at 300K . Oxygen and fuel CO burn to make CO2 gas in the reactor. My problem is that : The product gas CO2 is being made but there is no rise in the temperature. I have defined my own mixture template, and not using the predefined ones. I have defined the reaction according to it's stoichiometry and kinetics. Currently the Cp is set to constant 1000, ( as seen by me in one video of non-premixed combustion of CH4 gas ) The maximum temperature stays to 1700K, which is indeed the inlet fuel temperature ( fuel = CO ). I know that there is a problem in setting the properties value, as a function of temperature . Like that of Cp, viscosity, thermal conductivity etc. I tried searching for them, I got the relations of Cp as a function of temp. in polynomial form. e.g : a + bT +cT^-2 ; now how to put the T^-2 in the polynomial entry for Cp. Since it only gives T^+2 not T^-2. Secondly, since I have to encounter a wall reaction as well. I am not allowed to use the eddy dissipation model. Thus I am using the eddy dissipation/ finite rate model. Can someone tell me the difference between these two and why can't wall reaction be accommodated there ? Finally, I want to learn about the changes that would happen if I change the diffusivity, viscosity, thermal conductivity from constant to ideal-gas mixed etc. Last edited by Anshs; December 20, 2018 at 19:09. Reason: Nobody is helping me and answering my doubt, I'm stuck on this problem from 2 weeks

 Tags combustion, species tranport