【摘要】 采用统一二阶矩(USM)旋流燃烧模型对旋流数为0.5的美国Sandia国家实验室甲烷-空气旋流火焰进行了数值模拟。预报的轴向、切向时均速度、脉动速度均方根值、温度以及CO2和H2O浓度分布都和实验值吻合,验证了统一二阶矩模型的可靠性。从测量值和预报值可以看出,火焰几乎就位于回流区内,燃烧过程进行得很快,回流区的存在强化了燃烧。图8参8更多还原

【Abstract】 The methane-air swirling flame,（swirling number 0.5） of the Sandia National Lab,USA is being numerically simulated by the unified second order moment（USM） combustion model.The predicted axial and tangential time averaged velocities,as well as the root mean square averaged pulsation velocities,the distribution of temperature,CO₂ and H₂O concentration,all agree quite well with experimental data,herewith verifying the unified second order moment model’s reliability.Both experimental and prediction results indicate that the flame is basically located inside the recirculation zone.The combustion process proceeds very quick,with combustion intensified by the existing recirculation.Figs 8 and refs 8.更多还原