修正的SST k-ω模型在云状空化流动计算中的应用研究  

Study on Application of the Modified SST k- ω Model in Computation of Cloud Cavitating Flows

作　　者：张淼[1] 薛瑞[1] 皮漫[1] 黄蔚萍[1] 

机构地区：[1]中国水电顾问集团西北勘测设计研究院,西安710065

出　　处：《西北水电》2014年第4期76-81,共6页Northwest Hydropower

摘　　要：采用基于Rayliegh-Plesset方程的空化模型及实验结果,评价了修正的SST k-ω湍流模型在云状空化流动计算中的应用。采用不同的修正系数,分别计算了绕Clar k-y型水翼的云状空化流动,获得了随时间变化的空化形态和升、阻力等流场及动力特性。通过与实验结果的对比表明,修正后的模型可以更准确地捕捉云状空化区域的空穴形态和空泡脱落的非定常细节;密度函数中指数n的选取对计算所得的空穴长度、升阻力和主要频谱分布均有影响,并给出了n的合理取值范围,为后续水工模型的空化数值计算提供了参考依据。Based on cavitation model and experimental results of Rayliegh -Plesset equation, application of the modified SST k-ωmodel in the calculation of the cloud cavitating flows is evaluated.By application of the different correct factors, the cloud cavitating flows a-round Clar k-y-type hydrofoil are calculated respectively.Then the cavitation shape, the lift and drag forces, and the motive features var-ying with time are obtained.Through comparison with the experimental results, it presents that the modified model can much accurately capture the cavity shape of the cloud cavitation area and the non-stationary details of cavity shedding.Selection of n in the density func-tion impacts totally the calculated cavity length, the lift and drag forces, and the main frequency spectrum.The reasonable range of n val-ue is recommended so as to provide the calculation of cavitation values of the hydraulic model with reference.

关 键 词：湍流模型 云状空化 脱落频率 修正的SST k-ω 

分 类 号：TV222.2[水利工程—水工结构工程]