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使用RKE模型和RSM模型对某旋流燃烧器进行3D冷态湍流流动模拟计算,并从精度、计算量和收敛性3个方面对两个模型进行了比较。通过与PIV所测得的出口冷态流场对比表明,两个模型均可以较准确地预测燃烧器出口的宏观流场、径向速度和轴向速度分布。相比较而言,RSM模型在预报流场速度峰值的位置、回流区的大小、主流射流宽度等方面比RKE模型更准确一些,在收敛性上RSM模型也占优,而在计算量上,RSM模型略大一些,但对反应流计算,两个模型计算量基本一致。研究表明在模拟旋流燃烧器流场时RSM模型具有一定的优越性,建议优先考虑。
The RKE model and RSM model are used to simulate the 3D cold turbulent flow in a swirl burner, and the two models are compared from the accuracy, the amount of calculation and the convergence. Comparing with the cold flow field at the outlet of PIV, the two models can predict the macroscopical flow field, radial velocity and axial velocity distribution of the combustor outlet more accurately. In comparison, the RSM model is more accurate than the RKE model in predicting the location of the peak flow velocity, the size of the recirculation zone, and the width of the mainstream jet, and the RSM model is also dominant in convergence. In terms of computation, the RSM The model is slightly larger, but for the calculation of reaction flow, the two models are basically the same amount of calculation. The research shows that the RSM model has some advantages in simulating the flow field of swirling burner, and it is recommended to give priority to it.