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Ernesto January 13, 2000 06:56

Premixed flames
 
Hi to all STAR-CD users, as my first attempt to use STAR-CD, I'm trying to simulate a very simple laminar flame propagation in a premixed (stoichiometric) propane-air mixture, which filled completely a cubic closed vessel. A central spark ignition was used. The flame propagation seems to be reproduced using a single one-step reaction but temperature and density values seem to be not realistic (they are much higher than adiabatic flame temperature). I need some help! Thanks in advance. Ernesto

Ron January 13, 2000 22:35

Re: Premixed flames
 
Ernesto,

What type of boundary conditions are you using?

What are you using for a reaction rate model?

Do you have enthalpy set to Chemico?

Is Propane an active or passive scalar?

What differencing schemes are you using?

What are your inlet temperature and density?

Ron


Ernesto January 14, 2000 06:51

Re: Premixed flames
 
Dear Ron, thanks, I answer yr. question: a) What type of boundary conditions are you using? The vessel is completely closed by walls b) What are you using for a reaction rate model? The chemical kinetic rate as given in the user subroutine REACFN (but I have the same problem even using a very simple fixed reaction rate) I checked at the ignition point and c) Do you have enthalpy set to Chemico? Both (thermal and chemico) give tha same problem with temperature and density d) Is Propane an active or passive scalar? Active e) What differencing schemes are you using? Upwind differencing, for all scalars f) What are your inlet temperature and density? The initial temperature and density are at atmospheric temperature (there is no inlet, the vessel is just closed)

Regards

Ernesto



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