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对圆盘凸台钝体燃烧室的热态流场进行了大涡模拟,利用PIV实验数据,显示了大涡模拟对平均速度及均方根速度脉动量的预测与实验中的测量值基本吻合,模拟获得的钝体后回流区、钝体边缘存在的切应力层等湍流特征信息也得到了实验验证。采用两种不同亚网格模型的大涡模拟结果与实验对比表明,在流动情况特别复杂的区域,Germano动态亚网格模型对流场,尤其是湍流脉动的预测准确性要高于标准Smagorinsky亚网格模型。
Large-eddy simulation of the hot state flow field in the bluff-body combustion chamber is carried out. The PIV experimental data show that the prediction of the average velocity and the root mean square velocity pulsation by the large-eddy simulation basically agrees with the experimental ones The information of turbulent characteristics such as the bluff body backflow zone and the shear stress layer existing at the edge of the bluff body has also been experimentally verified. The comparison of large eddy simulation results and experiments using two different sub-grid models shows that the prediction accuracy of the Germano dynamic sub-grid model for the flow field, especially the turbulent ripple, is higher than that of the standard Smagorinsky sub-grid in regions with particularly complicated flow conditions Grid model.