一种离心力修正的湍流模型及其在数值模拟中的应用

A Centrifugal Force Modified Turbulence Model and Its Application on Numerical Simulation

通过分析强旋流场中离心力的作用,提出了考虑湍流脉动中离心力作功的湍流模型(k-ε-cf模型)。模型的特征参数根据大涡参数和小涡参数的几何平均得到,其中旋涡的频率与热线测量实验结果一致。运用k-ε-cf模型对一同轴旋转分层流燃烧器空气动力场进行了数值模拟,计算结果与实验数据吻合良好,比标准k-ε模型结果有较大改进。

Through analyzing the effect of centrifugal force in strong swirling flow field, a new turbulent model (k-ε-cf model) to computer power done by centrifugal force in the turbulent pulsation is proposed. The characteristic parameters in the proposed turbulence model are obtained according to the geometrical mean of the parameters of large vortex and small vortex. The frequency of the vortex in the model agrees well with the experimental results measured by hot wire anemometer. Air dynamic field in a co-axial swirling stratified flow burner has been simulated with k-ε-cf model. The computational results agree well with the experimental data, and are much better than that computed with standard k-ε model. Figs 4 and refs 4.