# Distribution of Phi (Equivalence ratio)

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 December 30, 2003, 23:50 Distribution of Phi (Equivalence ratio) #1 Mahbub Guest   Posts: n/a 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)?

 December 31, 2003, 02:00 Re: Distribution of Phi (Equivalence ratio) #2 Lars Ola Liavåg Guest   Posts: n/a 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

 January 2, 2004, 13:20 Re: Distribution of Phi (Equivalence ratio) #3 Mahbub Guest   Posts: n/a Hi Lars, Thanks a lot. Would you please tell me the unit of that scalar concentration?

 January 5, 2004, 01:47 Re: Distribution of Phi (Equivalence ratio) #4 Lars Ola Liavåg Guest   Posts: n/a 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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