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Old   March 16, 2013, 19:21
Default Methane/Air Combustion
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Przemek
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Hi All,

I would like to ask you guys for an advice in Methane/Air combustion modeling.

Problem description:
Enclosed domain through which air is flowing in a steady state manner (i.e. one inlet & one outlet), additionally one inlet with Methane supply. As a result (steady state) we have formed cloud of Methane/Air mixture with different equivalence ratios in different points in space.
Now I would like to place an ignition source (e.g. energy source) in a region where mixture is flemmable and burn it. I don't won't to simulate a diffusive burner but a sudden ignition of formed mixture. As a result I would like to get an estimated value of temperature/pressure rise in the domain.

The question is: should I consider abovementioned phenomenon as a partially-premixed flame regime? And which out of CFX14 combustion models will be appropriate for such flame model?

Thanks in advance,
Przemek
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Old   March 17, 2013, 05:37
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Glenn Horrocks
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I am no expert on combustion modelling so cannot give specific advice. But I suspect if all you want is a pressure/temperature history then a simple model like eddy dissipation will probably be OK. If you want combustion products/exhaust composition then you will need to be more advanced.
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Old   March 18, 2013, 16:30
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Thanks Glenn,

I'll try with EDM.

Regards,
Przemek
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Old   March 19, 2013, 05:33
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That's the place to start. Only go to the more complex models if you can show the simple ones are not good enough.
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