combustion in a furnace
 

Hi, i have to model a 3d combustion in a furnace. There are 2 streams: one is fuel ( 80% CO, 20% CH4); the other is air. Should i use finite rate chemistry or non premixed combustion? Any suggestions? Thanks

Re: combustion in a furnace
 

With no doubt the use of a pdf table is much more close-to-real than the use of the finite-rate combined with the eddy dissipation model. The use of the pdf table results in a longer flame due to the radicals' reactions, and this could be very important in furnaces' analyses.

Re: combustion in a furnace
 

Your question is a little like "I want to buy a new car - should I buy a red one or a blue one?" It depends.

What are you interested in? Temperatures? Flow patterns? Emissions? Do you have good data for kinetic expressions if you want to use finite rate chemistry? Do you have experimental data you want to match? How big is the furnace? How will you model turbulence? Will you do a steady-state model?

Contrary to Thomas' answer, you can radicals in finite rate formulation.

Good Luck.

Re: combustion in a furnace
 

Thanks for the answers. The combustion chamber is about 67 m3; the mesh is made up of 1600000 elements. i use standard k-e model for turbulence. My targets are temperature and velocity at the exit of chamber ( here i have experimental data to match).

Mattia,
Did you get a chance to simulate the combustion in a furnace? I am also working in the same field. I would apprecite if you could help me on the simulation approach.

Thanks,
Robi