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Old   May 25, 2005, 02:06
Default Gaseous Combustion Help
  #1
A.S.
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Hi,

I am doing a simple problem on gaseous combustion. The fuel is propane, which enters from 1 inlet and air entering from other inlet is taken as 21% O2 and 79% N2. I have set-up adiabatic PPDF model as guided in tutorial. Now the problem I am facing is that I am not getting proper results. I have checked model again and again with-out any clue where it is going wrong. My doubt is about 'solution method' in Analysis control for 'addiational scalars'. The default comes 'internal' for all scalars except 'mixture fraction' and 'variance', default scalar set-up by StarCd. My question is that what would be the 'solution method' for propane, o2 and n2. Similarly for CO, CO2 and H2O, products of reaction. This is a very simple case I am trying. Please help.

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A.S.
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Old   May 26, 2005, 04:40
Default Re: Gaseous Combustion Help
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matej
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Hi,

The tutorial works, and if you follow its settings, or take the defaults when setting the PPDF schema, it should be OK. Is your PPDF schema realy set? Have you tried to plot the profiles of the variables, temp, density?

you do not provide enough information for any reasonable help. tell us more what it means not good results. it does not combust? is the temerature low, high, solution diverges? what happens?

matej
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Old   May 26, 2005, 06:58
Default Re: Gaseous Combustion Help
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A.S.
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The solution is osscilating. My question is what should be method for transport in additional for propane(fuel), oxygen and nitrogen(air composition) and similarly for product of combsution like CO, CO2 etc. I am not modelling NOX at present. Actually am working on news gaseous combustor design.

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A.S.
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Old   May 31, 2005, 10:32
Default Re: Gaseous Combustion Help
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yjl
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Only the mixtue fraction and its variance should be solved by transport equations and all other scalars are solved by 'Internal' method. Also you need to run double precision.
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Old   May 31, 2005, 11:00
Default Re: Gaseous Combustion Help
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A.S.
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Thanks for your help.

A.S.
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