Reaction progress change in subdomain
 

Dear experts

I'm calculating a gas turbine burner using the TFC model. Below the burners I intruduce part of the oxidiser into the burner due to leackage flows through subdomains. I only have one single inlet of fresh air (which flows through the burners and through the leackages). I recognised that the inflow of fresh air below the flame leads to regions with reaction progress < 1 and additional reaction (combustion). How can I manipulate the air in the leackage subdomain to change its reaction progress artifically from 0 to 1? Sources? Thanks for any hints!

Severin