[reddy.anirudh27@gmail.com]

Hi everyone,

I am trying to model laminar diffusion flame for methane combustion.
The geometry is simple with center input methane jet (300 K , 0.5 m/s) surrounded by coflow input air(300 kelvin,0.1 m/sec)

I simulate non-reacting flows, after achieving convergence, I patch 2500 K high temperature zone for ignition and let it run with Laminar finite rate model and stiff chemistry activated.

I tried both 2 step methane-air reaction and one step methane-air reaction. In both the cases the maximum temperature predicted is 3300K and 3200 K respectively.

I used mixing law for Cp calculation of the mixture. Individual Species enthalpy are calculated by Piece wise polynomial.

I have seen many posts realted to this issue. Has anyone found a way to get temperature down to 2200 K ?
I tried similar case with Eddy disspiation model where temperature prediction was 2100K. (I know EDM is for turbulent cases)

Thank you

[mengke]

Hi,

I am also using laminar finite-rate to model a pre-mixed combustion between propane and air. However, I don't seem to get the sustained flame. The temperature returned to 300k soon after patching (3000k at the inlet). I am wondering what might be the problem here. Could you help? Thanksss!!!

Mengke

Originally Posted by reddy.anirudh27@gmail.com

Hi everyone,

I am trying to model laminar diffusion flame for methane combustion.
The geometry is simple with center input methane jet (300 K , 0.5 m/s) surrounded by coflow input air(300 kelvin,0.1 m/sec)

I simulate non-reacting flows, after achieving convergence, I patch 2500 K high temperature zone for ignition and let it run with Laminar finite rate model and stiff chemistry activated.

I tried both 2 step methane-air reaction and one step methane-air reaction. In both the cases the maximum temperature predicted is 3300K and 3200 K respectively.

I used mixing law for Cp calculation of the mixture. Individual Species enthalpy are calculated by Piece wise polynomial.

I have seen many posts realted to this issue. Has anyone found a way to get temperature down to 2200 K ?
I tried similar case with Eddy disspiation model where temperature prediction was 2100K. (I know EDM is for turbulent cases)

Thank you