复杂结构气体燃烧器三维流场和燃烧状况数值模拟

THREE-DIMENSIONAL NUMERICAL SIMULATION OF TURBULENT FLOW AND COMBUSTION IN GAS BURNER WITH COMPLICATED STRUCTURE

以美国JohnZink公司一种瓦斯燃烧器为几何原型 ,保持燃烧器和稳焰旋流器附近的三维复杂形状 ,生成了包括燃烧器和炉膛的结构化网格。以甲烷为燃料 ,采用标准的k ε湍流模型、双δ混合燃烧模型和蒙特卡洛辐射换热模型对燃烧器内的流动及燃烧状况进行了全尺寸数值模拟 ,计算了旋流器附近的复杂流场 ,预测了燃烧器流场、温度场以及各组分的分布状况。计算结果表明 ,标准的k ε湍流模型、双δ混合燃烧模型和蒙特卡洛辐射换热模型能够用于计算复杂结构内的流动和燃烧过程。

The standard k ε turbulent model, double δ mixed\|is\|burnt turbulent combustion model and Monte Carlo radiation model were used to simulate the three dimensional turbulent flow and methane combustion in a complicated gas burner produced by John Zink corporation. Structured grid for the complicated structure in the burner and its hearth was made. The flow field, temperature distribution and species concentrations were computed, and the turbulent field around the sprayer and the backflow region behind the sprayer were correctly predicted. The prediction is helpful to the optimization of burner and the improvement of burner efficiency. The simulation proved that the standard k ε turbulent model, double δ \|mixed is burnt turbulent combustion model and Monte Carlo radiation model are appropriate to calculate the turbulent flow and combustion in a complicated burner.