考虑旋涡效应的非定常空化流数值模型修正研究  

A modified method considering vortex effect for modelling unsteady cavitating flows

作　　者：洪伯杰 胡常莉 邢浩杰 Bojie Hong;Changli Hu;Haojie Xing(School of Energy and Power Engineering,Nanjing University of Science and Technology,Nanjing,210094,China)

机构地区：[1]School of Energy and Power Engineering,Nanjing University of Science and Technology,Nanjing,210094,China

出　　处：《Acta Mechanica Sinica》2023年第4期157-165,共9页力学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.52076108).

摘　　要：本研究的目的是考虑旋涡运动对非定常空化流动的影响,提出了一种空化模型和湍流模型的修正方法.在Zwart空化模型和SSTγ-Re_(θt)湍流模型中分别引入了由应变率张量和旋转率张量之比构建的函数.将该修正方法用于模拟绕Clark-Y水翼的非定常云空化流动,并通过与实验数据对比进行评估.研究结果表明,修正模型能够更好地捕捉到云空化的非定常过程,特别是充分发展的附着空穴和大尺度的云空泡脱落行为.这都得益于修正方法中单位能量的湍流耗散率和蒸发率的提高.此外,修正模型所预测的升力系数随时间的波动和时均流向速度分布与实验结果有较好的一致性.The objective of this study is to propose a modified method for the cavitation model and turbulence model,accounting for the influence of vortex motion on unsteady cavitating flows.A function of the ratio of strain rate tensor and rotation rate tensor is introduced into the Zwart cavitation model and the shear stress transfer(SST)γ-Re_(θt) turbulence model respectively.The modified method is applied to simulate the unsteady cloud cavitating flow around Clark-Y hydrofoil and evaluated by the experimental data.The results show that the modified model can better capture the unsteady process of the cloud cavity,especially the fully developed attached cavity and the large-scale cloud shedding behaviors.These benefit from the increase of turbulent dissipation rate per unit energy and the evaporation rate of the modified method.In addition,the lift coefficient fluctuation in time and the time-averaged u-velocity profiles predicted by the modified model are better agreement with the experimental results.

关 键 词：蒸发率 修正模型 非定常空化 湍流耗散率 空化模型 升力系数 旋涡运动 数据对比 

分 类 号：O3[理学—力学]