关键词: 湍流燃烧;二阶矩燃烧模型+;大涡模拟+;旋流燃烧

Abstract: The methane-air swirling diffusion combustion was studied by large-eddy simulation(LES) using a Smagorinsky-Lilly sub-grid-scale(SGS) turbulence model,a second-order moment(SOM) sub-grid-scale(SGS) combustion model,proposed by the present authors,and an eddy-break-up(EBU) combustion model used by some investigators.The LES statistical results are compared with the experimental results and the Reynolds-averaged Navier-stokes(RANS) modeling results using the Reynolds stress equation model and the secondorder moment(SOM) combustion model.Both SOM-SGS combustion model and RANS-SOM model give the results in good agreement with the experimental results,but the LES-EBU modeling results are not in agreement with the experimental results.In different regions the LES-EBU model over-predicts or under-predicts the temperature.The reason is that the effect of chemical kinetics is not taken into account in the LES-EBU modeling.The LES instantaneous results show that the size and range of large vortex structures in swirling combustion are different from those of the jet combustion.

Key words: Turbulent combustion;Second-order moment combustion model~+;Large-eddy simulation~+;Swirl combustion