Does teh flow simulation has combustion toos/

I have a chemcial reaction between air an gas in a very long tube. The chemical reaction occurs at the beginning of the tube. I would like to predict by simulation the tube temperature. I know the gas pressure and the air / gas percentage and the burner geometery and characteristics.

If there is no combustion module, what is the easiet way to predict the tube temperature/

Please advise.

Regards

Samer Hassan