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-   -   combustion model in premixed combustion chamber (http://www.cfd-online.com/Forums/fluent/48368-combustion-model-premixed-combustion-chamber.html)

wuyu May 29, 2008 09:17

combustion model in premixed combustion chamber
 
I try to use the "premixed combustion model" and "transport species model" in FLUENT, however, the result is not good. who have the experience to calculate the premixed combustion in FLUENT? can you give me some advices and some important points in the setting of parameter. thanks

renzo May 29, 2008 09:50

Re: combustion model in premixed combustion chambe
 
The choice of a combustion model depends on the flow regime of your system. In general you can you use either the finite rate/eddy dissipation model (under transport species) for turbulent flows as a starting poit. Default parameters work well quite often.

Pay attention, if you are using ideal gas law for the density, to the operating pressure setting.

bye

Renzo


wuyu May 29, 2008 11:04

Re: combustion model in premixed combustion chambe
 
thank you for your answer. I have tried to use "transport species" model and "finite rate/dissipation" model, firstly, I calculate the isothermal flow field without combustion,however, after ignition in a point in the flow(patch the temperature and the mass fraction of production), after sever iteration, I can not get any flame because with the decrease of temperature, the arrhenius reaction rate is too small, it quench the flame(using defaute parameters for propane). what can I do to solve this problem? change the constant of reaction rate?

renzo May 29, 2008 11:29

Re: combustion model in premixed combustion chambe
 
when using fr/ed keep in mind that you need not only to patch the domain with a enough high temperature but also with a minimun concentration of the species involved in the combustion process (both reactants and products).

If it does not work yet, plese describe your domain in detail.

I hope it is useful for you.

bye

Renzo

Billy May 30, 2008 03:57

Re: combustion model in premixed combustion chambe
 
I can't understand "ignition in a point ". I always ignition all the zone and let it iteration. Sometimes I got a good result, or you can say I get the flame. I will pay attention to your job!

pbaranidaran March 15, 2012 12:25

Hi,

I am trying to solve a similar case of premixed combustion with no inlet and outlet. I am not getting good results while using Species transport model. I mean the results doesn't make any physical sense.Please help me on this.

soliddesign March 26, 2014 14:58

hi did you ever solve this problem as i am doing a very similar simulation and having trouble getting the flame to occur


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