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September 19, 2007, 10:00 |
The tutorial concerning diesel
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#1 |
Member
Tomislav Sencic
Join Date: Mar 2009
Posts: 42
Rep Power: 17 |
The tutorial concerning diesel is done with heptane C7H16. I would like to use different hidrocarbons, for example C12H26. I know I have to change the species, the reactions and the coeffs in chemkin/chem.inp and the nasa polinomials in chemkin/term.dat. I supose also in constant/thermophysicalproperties i should ad some coeffs but I do not know how.
What do I have to change to use a different fuel then those mentioned in chemkin/therm.dat? |
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September 21, 2007, 05:25 |
I found the IDEA fuel in the s
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#2 |
Member
Tomislav Sencic
Join Date: Mar 2009
Posts: 42
Rep Power: 17 |
I found the IDEA fuel in the src/thermophysicalModels/liquids directory, but I do not know how to use it.
What do I have to do in order to use the IDEA fuel? |
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September 21, 2007, 05:44 |
Hi. Tomislav
You can use th
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#3 |
Guest
Posts: n/a
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Hi. Tomislav
You can use the fuel by changing the liquidFuelComponents in constant/thermophysicalProperties. |
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September 21, 2007, 06:59 |
Thanks.
I tried but I receive
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#4 |
Member
Tomislav Sencic
Join Date: Mar 2009
Posts: 42
Rep Power: 17 |
Thanks.
I tried but I receive again some errors. Do I have to change the reactions and the species in chem.inp? Do I have to put the reactions for both the components of IDEA (C10H7-CH3 and N-C10H22(DECANE)? Where can I find the reaction coefficients? Do I have to change something in chemkin/thermo.dat? |
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September 21, 2007, 08:08 |
I tried to use C14H30. I chang
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#5 |
Member
Tomislav Sencic
Join Date: Mar 2009
Posts: 42
Rep Power: 17 |
I tried to use C14H30. I changed chem.inp with the reaction
2C14H30 + 43O2 => 28CO2 + 30H2O but I get --> FOAM FATAL ERROR : Elemental imbalance in H in reaction irreversibleArrheniusReaction 2C14H30^0.25 + 43O2^1.5 = 28CO2 + 30H2O (2.81171e+06 0 7940.36) on line 10 What is the reason? |
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September 21, 2007, 09:05 |
Hi Tomislav,
Try with the
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#6 |
Member
Tommaso Lucchini
Join Date: Mar 2009
Posts: 87
Rep Power: 17 |
Hi Tomislav,
Try with the following C14H30 + 21.5 O2 => 14CO2 + 15H2O and see what happens. bye |
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September 21, 2007, 09:13 |
Hello,
Shouldn't you be usi
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#7 |
Member
Guido Adriaensen
Join Date: Mar 2009
Posts: 56
Rep Power: 17 |
Hello,
Shouldn't you be using: C14H30 + 21 O2 => 14 CO2 + 15 H2O The O was in imbalance. Guido |
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September 21, 2007, 09:15 |
Sorry,
Never mind my post :
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#8 |
Member
Guido Adriaensen
Join Date: Mar 2009
Posts: 56
Rep Power: 17 |
Sorry,
Never mind my post :-) Thought there was something else written there. Tommaso's post was correct, sorry again. |
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September 21, 2007, 09:45 |
Tomislav,
it seems to be so
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#9 |
Member
Tommaso Lucchini
Join Date: Mar 2009
Posts: 87
Rep Power: 17 |
Tomislav,
it seems to be something related to the coefficients: FORD / C14H30 0.25 / FORD / O2 1.5 / Try to investigate what they mean. |
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September 21, 2007, 09:55 |
Yes, I just left them from the
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#10 |
Member
Tomislav Sencic
Join Date: Mar 2009
Posts: 42
Rep Power: 17 |
Yes, I just left them from the tutorial for C7H16. I 'll try to investigate.
Anyway, thanks |
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November 8, 2011, 04:53 |
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#11 |
Member
Abhishek
Join Date: Dec 2010
Posts: 39
Rep Power: 16 |
Hi everyone,
I am trying to run sprayFoam. I am using C12H26 and have added the specie in therm.dat and reaction in chem.inp. ELEMENTS H O C N AR END SPECIE C12H26 O2 N2 CO2 H2O END REACTIONS 2C12H26 + 37O2 => 24CO2 + 26H2O 3.00E+5 0.0 15780.0! 1 FORD / C12H26 0.75 / FORD / O2 1.5 / END I am getting following error. --> FOAM FATAL ERROR: Elemental imbalance in H in reaction irreversibleArrheniusReaction 2C12H26^0.75 + 37O2^1.5 = 24CO2 + 26H2O on line 10 From function chemkinReader::addReaction in file chemistryReaders/chemkinReader/chemkinReader.C at line 782. FOAM exiting Where is the imbalance? |
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February 16, 2012, 14:25 |
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#12 |
New Member
Roberto Torelli
Join Date: Jun 2011
Posts: 1
Rep Power: 0 |
Hi everyone!
I have a question for Abhishekd18 (and also for everyone who could help me). Did you solve the problem of the reaction imbalance? I have the same problem and I also tried to divide by 2 all the reaction coefficients in order to have a unitary coefficient for the dodecane, but still nothing... Furthermore I have updated my therm.dat with the correct janaf coefficients, so I think the problem is related only to the chem.imp file. I hope you could help me and thanks in advance! :-) Roberto |
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August 12, 2013, 15:51 |
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#13 | |
New Member
Juan Manuel Mompó Laborda
Join Date: Nov 2009
Location: Valencia (Spain)
Posts: 10
Rep Power: 17 |
Quote:
Hi Abhishekd, Where did you get the JANAF coefficients for C12H26 from? Could you please share them? Thanks! Juanma |
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