Methane/Air Combustion
 

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

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.

Thanks Glenn,

I'll try with EDM.

Regards,
Przemek

That's the place to start. Only go to the more complex models if you can show the simple ones are not good enough.