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-   -   gasoline spray simulation using dieselFoam (http://www.cfd-online.com/Forums/openfoam/65429-gasoline-spray-simulation-using-dieselfoam.html)

qhdgj June 14, 2009 15:52

gasoline spray simulation using dieselFoam
 
Dear All,
Has anybody ever used the dieselFoam solver to simulate a gasoline spray/combustion? I just wonder which fuel did you use in your simulation? I could not find any fuel type with similar properties to gasoline in the fuel library in dieselFoam, like isooctane (C8H18)...
I appreciate any suggestions from you.

Thanks a lot,
-Jason

Rachel June 16, 2009 11:35

Hi Jason,

http://foam.sourceforge.net/doc/Doxy...2d8a6a643.html

I guess that is the liquid you are looking for?

qhdgj June 16, 2009 15:10

Thank you very much, Rachel.
-Jason

Rachel June 19, 2009 02:22

Hi Jason,

Try changing to
CHEMKINFile "$FOAM_CASE/chemkin/chem.inp";
CHEMKINThermoFile "$FOAM_CASE/chemkin/therm.dat";

malaguti June 22, 2009 12:00

Gasoline injection and chemkin.inp setup
 
Hello,
I'm trynig to simulate a gasoline injection starting from the aachenBomb tutorial. I need to change the chemkin.inp file in order to match with octane fuel propreties. May you suggest to me the costant values I have to use into the file to balance the reaction?

Thank you very much for your help
Simone

niklas June 23, 2009 05:02

Quote:

Originally Posted by malaguti (Post 220082)
Hello,
I'm trynig to simulate a gasoline injection starting from the aachenBomb tutorial. I need to change the chemkin.inp file in order to match with octane fuel propreties. May you suggest to me the costant values I have to use into the file to balance the reaction?

Thank you very much for your help
Simone

for a general reaction
C_xH_y + a O_2 -> b CO_2 + c H_2O
balancing C, H and O atoms.
C: x = b -> b= x
H: y = 2c -> c = y/2
O: 2a = 2b + c -> a = b + c/2 = x + y/4

malaguti June 23, 2009 06:52

Gasoline injection and chemkin.inp setup
 
Thank you very much, but my question was too general. I meant the three Arrhenius coefficients used in the chem.inp: I'm not able to find the correct values for octante reaction and at the same time I'm not able to understand the meaning of the last two variable of the file (I mean the two line "FORD" in the reported code for the eptane below).



ELEMENTS
H O C N AR
END
SPECIE
C7H16 O2 N2 CO2 H2O
END
REACTIONS
C7H16 + 11O2 => 7CO2 + 8H2O 5.00E+8 0.0 15780.0! 1
FORD / C7H16 0.25 /
FORD / O2 1.5 /
END

niklas June 23, 2009 07:05

http://www.cvd.louisville.edu/Course/Chemical Vapour Deposition/Manuals/chemkin/chemkin1chemkin.pdf

page 29

the correct values are trickier...

qhdgj June 25, 2009 15:51

have tried changing to "$FOAM_CASE/chemkin/therm.dat", but the problem is still there. I think the "therm.dat" file does not contrain any data of C8H18. I assume I need to use another thermophysical model rather than "hMixtureThermo<reactingMixture>". Do you guys have any further suggestions?

Thanks a lot,
-Jason

Quote:

Originally Posted by Rachel (Post 219811)
Hi Jason,

Try changing to
CHEMKINFile "$FOAM_CASE/chemkin/chem.inp";
CHEMKINThermoFile "$FOAM_CASE/chemkin/therm.dat";



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