加力燃烧室污染特性的大涡模拟

Large Eddy Simulation of Pollutant Performance in an Afterburner

采用k方程亚网格尺度模型对模型加力燃烧室的污染特性进行大涡模拟研究,其中污染物CO亚网格尺度模型是以二步化学反应为基础,NO采用亚网格动力学模型,并用亚网格EBU燃烧模型估算化学反应速率,用热通量辐射模型估算辐射通量,通过数值计算结果与实验数据的比较,表明采用的亚网格污染物生成模型可以用于实际加力燃烧室污染物排放的预估.

The k-equation subgrid-scale model is used for large-eddy simulation (LES) of the pollutant performance in the model afterburner with V-gutter flame stabilizer. A two-step turbulent combustion subgrid-scale model is employed for calculating CO concentration. The NO subgrid-scale pollutant formation model is applied to the evaluation of the rate of NO formation. The EBU combustion subgrid-scale model is used to determine the chemical reaction rate. The heat flux model is applied to prediction of the heat flux. Agreement between the predictions and experiments shows that pollution formation subgrid-scale models can be used to predict pollutant emissions in an afterburner.