摘要
本文通过对三种双时间尺度湍流模型的理论分析，选择出最合理的模型，并在其基础上引入非线性Reynolds应力─应变关系式及梯度Richardson数修正，对有旋湍流场进行计算，其结果表明，双时间尺度模型能较好地预测出复杂湍流场中平均物理量的分布，尤其对回流区大小和强度的预测较常规k-ε模型结果有很大改进。因此，本文将双时间尺度模型应用于旋流燃烧器中气体颗粒两相流动的计算。
Three kinds of two-time-scale turbulence models in the literature are analyzed from the point of view of the selection of the partitioning wave nUmber, and Kim model is found to be the most reasonable. Then a non-linear Reynolds stress-strain expres sion and Launder's gradient Richardson number modification are incoporated into Kim model respectively. The computational results of confined coaxial swirling jet show that multiple-time-scale models yield markedly improved results over the standard k-E model in predicting mean physical quatities of complex turbulent flows, especially the recirculation region size. We also apply Kim model to gas-particle two phase flow in swirling combustors.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
1997年第1期28-32,共5页
Journal of Engineering Thermophysics
关键词
有旋流
双时间尺度
湍流
模型
流场
swirling flow, two-time-scale, turbulence models
