模型燃烧室紊流燃烧的大涡模拟

采用了两种不同的亚网格尺度燃烧模型对带 V型稳定器的模型燃烧室紊流化学反应流动进行了大涡模拟 ,用 k-ε方程亚网格尺度模型确定亚网格紊流粘性 ,为了考虑热辐射对燃烧室壁温和气流温度的影响 ,运用热流法辐射模型估算热辐射通量 ,用 SIMPLE算法和混合差分求解大涡模拟各守恒方程 ,通过对两种不同亚网格尺度燃烧模型数值模拟结果与实验值的比较表明 ,两种燃烧模型都与实验值较吻合 ,但 G方程小火焰模型要比亚网格 EBU燃烧模型符合得更好些

Large-Eddy Simulation of Turbulent Combustion in A Model Combustor

Two different subgrid-scale combustion models were used for the Large-Eddy Simulation (LES) of turbulent chemical reaction flows in a model combustor with V-gutter flame holder.The subgrid eddy viscosity was determined by using k-equation subgrid-scale (KSGS) model.To take into account the influence of heat radiation on wall temperature and gas temperature distributions,heat flux model was applied to predict heat flux distributions.The LES equations were solved with SIMPLE algorithm and hybrid scheme.Comparison of numerical results with experimental data shows that the two different subgrid-scale combustion models can all be used to simulate the combustion,but the G-equation flamelet model is better than the EBU subgrid combustion model.These results provide confidence that the LES may lead to a better understanding of the combustion process.