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Temperature don't rise after I used C2H6 insteading of CH4 in counterFlowFlame

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Old   November 21, 2013, 06:50
Default Temperature don't rise after I used C2H6 insteading of CH4 in counterFlowFlame
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赵庆良
Join Date: Aug 2013
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Hi Foamers,
The case "counterFlowFlame" in ReactingFoam solver uses CH4 as fuel,and the reaction is
Quote:
reactions
{
methaneReaction
{
type irreversibleArrheniusReaction;
reaction "CH4 + 2O2 = CO2 + 2H2O";
A 5.2e16;
beta 0;
Ta 14906;
}
}
However,I want to use C2H6 insteading of CH4,and modify the reaction as following:
Quote:
reactions
{
methaneReaction
{
type irreversibleArrheniusReaction;
reaction "2C2H6 + 5O2 = 4CO2 + 6H2O";
A 5.2e16;
beta 0;
Ta 14906;
}
}
The parameter about C2H6 I used is :
Quote:
C2H6
{
specie
{
nMoles 1;
molWeight 30;
}
thermodynamics
{
Tlow 200;
Thigh 6000;
Tcommon 1000;
highCpCoeffs ( 6.10683385e+00 1.29236361e-02 -4.42527196e-06 6.87391726e-10 -3.98901732e-14 -1.37500014e+04 -1.30081250e+01 );
lowCpCoeffs ( -2.52854344e-02 2.40764754e-02 -1.11893472e-05 2.08340901e-09 -5.29868616e-14 -1.12345534e+04 2.11648750e+01 );
}
transport
{
As 1.67212e-06;
Ts 170.672;
}
}
Although the case can be ran after changing,the temperature don't rise .When using CH4,the temperture can be rise up 2000K.It seems that the reaction don't happen.what's the reason?Did I make some thing wrong?Should I change the value of "Ta"?Any reply will be appreciated!Thanks in advance!
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