浮力对湍流旋流火焰影响的数值模拟

Numerical Simulation of the Influence of Buoyancy on Turbulent Swirling Flame

采用浮力修正的k-ε湍流模型和涡团耗散(EDC)湍流燃烧模型,对旋流燃烧室内具有不同初始切向动量或旋流数的受浮力作用的甲烷湍流火焰进行了数值模拟,得到三组工况下的气体温度场、组分体积分数场、速度场和湍流脉动特性的分布,并与试验测量数据进行了比较.结果表明:浮力对初始切向动量或旋流数较高的湍流火焰有更强的影响.

Numerical simulation has been performed for turbulent buoyant methane flames with different initial tangential momentum or swirl numbers in a swirl combustion chamber using buoyancy-modified k-ε turbulence model and eddy dissipation concept（EDC） turbulent combustion model,during which the distributions of gas temperature,species volume fraction,velocity,and turbulent fluctuation characteristics were obtained under three cases.Simulated results were compared with experimental measurements.Results show that the buoyancy evidently influences the turbulent flame with larger initial tangential momentum or swirl number.