How to get Stoichiometric Mixture fraction value of mixed fuel?

wenxu · December 25, 2014, 08:42

Hello, forumers,
Merry Christmas!
Now i want to generate the flamelet library using Cantera. But the stoichiometric Mixture fraction is required in the input file. The library is generated by a counterflow flame. The fuel side is :

Quote:

CH4:0.5442,CO:0.26199,C2H2:0.1938,AR:0.00001

And the other side is:

Quote:

O2:0.21,N2:0.79

which is mole fraction. The how can i get the Stoichiometric Mixture fraction (Zst) ? Please give me some hints, i have stuggered here for some time...

regards,
wenxu

farhad_ir56 · April 4, 2015, 07:16

Dear Wenxu

i have problem at the same. i want to run ./flamelet for biodiesel liquid fuel.
there are two problems.
first: calculation Stoichiometric Mixture fraction (Zst) in input.txt.
second: who can i implement the initial condition file for my fuel ( solution.xml).
if you deal with please let me know the guidline.
Thank you
Farhad

Quote:

Originally Posted by wenxu

Hello, forumers,
Merry Christmas!
Now i want to generate the flamelet library using Cantera. But the stoichiometric Mixture fraction is required in the input file. The library is generated by a counterflow flame. The fuel side is : And the other side is: which is mole fraction. The how can i get the Stoichiometric Mixture fraction (Zst) ? Please give me some hints, i have stuggered here for some time...

regards,
wenxu

wenxu · April 4, 2015, 08:11

Dear Farhad,

1) First there are many definition for mixture fraction (as far as I know, at least four!), here for mixed fuel, the Bilger's definition is suggested.-----Based on element.

2) Now I use FlameMaster to generate flamelet library. I am not very familiar with the developed Canter code. But I know that the solution.xml is the start file for calculation flamelet equations and it is based on gri.30 (you know?) So you can use this file if you also want to use gri.30 as your mechanism.

Hope this helps,

regards,
wenxu

farhad_ir56 · April 4, 2015, 10:09

Dear sir

i found the Z(st) formulation from RWTH university paper.
as you mentioned, in counterflow software are 2 samples , H2O2 and CH4 case
gri3.0 is related to CH4 but my fuel is liquid and has different mechanism.
anyway, my prof. suggest me to use Flamemaster.but i used CHEMKIN for creating tables.
dose the Falmemaster easy to use and installtion on linux?

wenxu · April 4, 2015, 10:33

Not easy to use for newers but easy to install. Anyway, it is a promising tool to generate flamelet library.

April 4, 2015, 10:33		#5
wenxu Senior Member Freedom Join Date: May 2014 Posts: 209 Rep Power: 12	Not easy to use for newers but easy to install. Anyway, it is a promising tool to generate flamelet library. Last edited by wenxu; April 4, 2015 at 21:51.

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April 4, 2015, 08:11		#3
wenxu Senior Member Freedom Join Date: May 2014 Posts: 209 Rep Power: 12	Dear Farhad, 1) First there are many definition for mixture fraction (as far as I know, at least four!), here for mixed fuel, the Bilger's definition is suggested.-----Based on element. 2) Now I use FlameMaster to generate flamelet library. I am not very familiar with the developed Canter code. But I know that the solution.xml is the start file for calculation flamelet equations and it is based on gri.30 (you know?) So you can use this file if you also want to use gri.30 as your mechanism. Hope this helps, regards, wenxu

April 4, 2015, 10:09		#4
farhad_ir56 New Member Farhad Join Date: Sep 2013 Location: Tehran Posts: 6 Rep Power: 12	Dear sir i found the Z(st) formulation from RWTH university paper. as you mentioned, in counterflow software are 2 samples , H2O2 and CH4 case gri3.0 is related to CH4 but my fuel is liquid and has different mechanism. anyway, my prof. suggest me to use Flamemaster.but i used CHEMKIN for creating tables. dose the Falmemaster easy to use and installtion on linux?