Inlet air preheating

usker

I am trying to simulate a gas burner (transient, unremixed/diffusion combustion). First I calculated temperature and NOx with inlet air temperature 293K. Now I want to calculate with inlet air preheating. I selected 3 different air temperatures 473,673 and 873K. I insert these temp values into "Define Boundary Regions" and I also insert the air density at that particular temperature (for example temp-473K, density-0.738404kg/m3). The solution method and analysis controls are the same for every case. But when I get the results of Temperature and NOx distribution, the values of flame temp and NOx appears to be the same for all conditions (temp 293,473,673 and 873). Could you please advise what I have to do to get correct results.

Regards