Based on Prantle's mixture theory and the mixture index concept of turbulent combustion recirculating zone,the effect of mixture in turbulent combustion on NO x turbulent formation was theoretically studied.Damkohler number was calculated according to the results of experiment and the comparing evaluation between the simulating and experimenting of present research on NO x formation rate.The results show that the NO x formation is the non-equilibrium reacting flow controlled jointly by diffusion and reac...