Distribution of Phi (Equivalence ratio)
 

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)?

Re: Distribution of Phi (Equivalence ratio)
 

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

Re: Distribution of Phi (Equivalence ratio)
 

Hi Lars, Thanks a lot. Would you please tell me the unit of that scalar concentration?

Re: Distribution of Phi (Equivalence ratio)
 

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