[Nucnele]

Hi, I'm newbie with Fluent.

I'm studying a CO/H2-Air burner and I'm trying to calculate prompt and thermal NOx. The following values have been used in calculating the mixture fraction:
Total Mass fraction of Oxygen atoms in the air stream, Zo,o = 0.233
Total Mass fraction of Carbon atoms in the air stream, Zc,o = 0.0
Total Mass fraction of Hydrogen atoms in the air stream, Zh,o = 0.0
Total Mass fraction of Oxygen atoms in the fuel stream, Zo,f = 0.4995
Total Mass fraction of Carbon atoms in the fuel stream, Zc,f = 0.3746
Total Mass fraction of Hydrogen atoms in the fuel stream, Zh,f = 0.1259

I would like to know how to calculate fuel carbon number and equivalence ratio.

In Ansys help, I read that fuel carbon number is the number of carbon atoms in a fuel molecule but I have two species in my fuel. How should I do?
Equivalence ratio is given by actual "fuel-air-ratio" and stoichiometric "fuel-air-ratio" but I have a burner with not defined mass of injected air. I don't know how to calculate it.

Help me please. I'm sorry for my bad english but I'm italian.
Thank you a lot for every answer!

[Nucnele]

Some help please?

[Benaissa Sabrina]

Originally Posted by Nucnele

Some help please?

I have the same problem

[Cpt_Weisemann]

Fuel carbon number is the total number of carbon atoms in the fuel. For example your fuel has 90% CH4, 7% C2H6 and 3% C3H8; then your fuel carbon number is:
0,9*1 + 0,07*2 + 0,03*3 = 1,13

Equivalance ratio is = 1/lambda = 1/(1+%O2/(21-%O2))

If your O2% is 3,5% then:
equivalance ratio is 0,8333