combustion model -- CFD Online Discussion Forums

February 25, 2002, 04:28	combustion model	#1
Hennie van der Westhuizen Guest Posts: n/a	I'm trying to introduce the Magnussen combustion model to my SI engine model but at the time of combustion nothing happens. I cannot find clear instructions on how to set the various parameters for this model in the manuals. My parameters are currently: ufactor: 0.5 mixture fraction: 1 no conditional enthalpy tscale adjust: standard reaction: C8H18 + 12.5O2 -> 8CO2 + 9H2O rate eqn: no products Amix: 4 Bmix: 0.5 reactant parameters: 02 fixed fraction 0.233 leading reactants: C8H18 products: CO2, H2O ignition fraction: 0.05 time: iteration knock model: off Ignition starts 10 deg BTDC and continues till the last time step.All the scalars have been defined and their concentrations in the cylinder set to: C8H18: 0.0665 O2: 0.1960 N2: 0.7375 When running the simulation, the fluid temperature in the combustion chamber gets up to 600K due to compression but no chemical reaction takes place.Is there any other parameters I need to set for the model to work? I would appreciate any suggestions.

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