Abstract: A variable-density stochastic vortex model is used in simulating H₂/O₂/N₂ turbulent jet diffusion flames,in which turbulence is modeled by vortex sample,vortex suppression and vortex turnover.A large-vortex suppression mechanism for variable density reacting flows is presented and effects of parameters in model prediction are discussed in detail.It shows that the modified model can predict reasonably H₂/O₂/N₂ jet flame structures,and reflect characteristics of turbulent vortices.It also reveals that various parameters in vortex sample and vortex suppression affect results of the model.

Key words: variable-density stochastic vortex model, large-vortex suppression, chemical reaction, numerical simulation