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Distribution of Phi (Equivalence ratio)

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Old   December 30, 2003, 23:50
Default Distribution of Phi (Equivalence ratio)
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Mahbub
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I'm trying to simulate the mixture of Air and Methane in a combustion chamber. How can I get the distribution of Phi (Equivalence ratio)?
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Old   December 31, 2003, 02:00
Default Re: Distribution of Phi (Equivalence ratio)
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Lars Ola Liavåg
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Hello Mahbub,

Try PROSTAR's operate command. If your methane fuel is scalar #1 and any residual gases are scalar #2, you could use:

*set,afst,17.20105 ! stoichiometric A/F ratio

oper,getc,conc,5,1 $oper,getc,conc,6,2

oper,add,5,6,4 $oper,ssub,1,4,4 $oper,divi,4,5,4

oper,sdiv,afst,4,4

Best regards, Lars Ola
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Old   January 2, 2004, 13:20
Default Re: Distribution of Phi (Equivalence ratio)
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Mahbub
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Hi Lars, Thanks a lot. Would you please tell me the unit of that scalar concentration?
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Old   January 5, 2004, 01:47
Default Re: Distribution of Phi (Equivalence ratio)
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Lars Ola Liavåg
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Hello Mahbub,

I'm personally using SI units but the equivalence ratio is anyway a dimensionless quantity. The inputs are the scalar mass fractions as obtained directly from STAR-CD and the stoichiometric air/fuel (mass) ratio, which is also dimensionless.

Regs.

Lars Ola
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