I have got a complete mechanism for DME combustion (700+ reactions,100+species). I need to reduce the number of reactions as well as the number of species for analysis in FLUENT. Can anybody help me on this issue?
Mr. Zhen Huang who is an expert on DME fuel, might give you some help you want.
A method you could follow is subdividing the total reaction system in reactions of the same kind, having similar activation energy and stoichiometry. There is no major need to consider ALL reactions and species.
Another method could be to apply the steady state hypothesis. In that case you suppose (somewhat erroneously) that the individual free radicals do not change in number. Thus, a differential equation with their rates of formation and depletion can be replaced by an algebraic equation. This works reasonably well for pyrolysis reactions, but I doubt that you could apply it in combustion reactions, showing a fast multiplication of free radicals and a considerable rise in temperature.
The best approach could be to run the entire system and then drop or lump certain reactions and see what happens. I tried this approach in another age, with very slow computers at that time. Integration should proceed by small steps, or you must try and find suitable algorithms to deal with stiff equations.
Thank you sir. I would go with the last method . With Chemkin it would be easy to deal with this problem.
Hi Mr. Swapnil Tupkari,
The reduced mechanism for DME combustion is available in the open literature. If you search it just by using Science Direct or google then I believe that you will find your desired Chemkin formatted reduced mechanism for DME combustion.
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