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-   -   ???Flame extinct (Methane-Air) (http://www.cfd-online.com/Forums/fluent/28478-flame-extinct-methane-air.html)

Harry Qiu April 24, 2001 22:18

???Flame extinct (Methane-Air)
 
Dear Mr. or Mrs:

I'm modeling premixed laminar combustion for methane/air.

I meet a great difficulty --> At the beginning of iteration, I set the Cp as constant(1000J/kg.k), then the flame front is basically formed as the iteration proceeds. But the temperature of the flame is too higher than 3000k. So in order to reduce the flame temperature to the reasonable level, I set the Cp as "Mixing Law", but the flame will be extinct soon after I set the Cp as "Mixing Law".

Can you tell me why?

Thank you. Sincerely yours, Harry.

Steven Smith April 25, 2001 10:34

Re: ???Flame extinct (Methane-Air)
 
In addition to using the "mixing law" for the methane-air mixture, I suggest you verify the specific heat for each specie in the flowfield is defined using the piecewise-polynomial option.

Harry Qiu April 26, 2001 09:32

Re: ???Flame extinct (Methane-Air)
 
Hi,Steven:

Thank you for you reply. I do have set the specific heat for each specie in the flowfield as piecewise-polynomial(by default value). do you have any other suggestions? Thank you.

Sincerely yours, Harry.



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