摘要
为了研究云空化周期性演变过程中的空泡动力学特性,基于均相流模型与离散相模型构建了一种单向耦合欧拉-拉格朗日思想的水力空化模拟方法,对空化数σ=0.8的二维Clark-Y水翼云空化流动进行了数值计算,得到了水翼瞬时升力系数变化及其表面云空化演变过程.通过求解球形空泡动力学方程,获取了该水翼云空化区内的空泡动力学演变规律.研究结果表明:该数值方法较好地模拟了水翼云空化内空泡的周期性行为;示踪粒子沿途压力的剧烈程度受空泡脱落与溃灭位置的影响;空泡内压与其所受流场压力有关,流场压力变化越剧烈,空泡内压幅值越高,其溃灭所释放的压力波也就越大,当空泡半径收缩至15.7μm时其溃灭压强最大幅值可达69.800 MPa;空泡初始半径增大,空泡内压幅值随之减小,空泡形态变化基本稳定.文中研究方法可为大型水力机械中的球形空泡溃灭行为研究提供理论参考.
In order to study the dynamic characteristics of cavitation during the periodic evolution of cloud cavitation,a one-way coupled Euler-Lagrangian hydrodynamic cavitation simulation method was proposed based on the homogeneous flow model and the discrete phase model.Numerical calculations were carried out for the cloud cavitation flow over a two-dimensional Clark-Y hydrofoil with a cavitation number ofσ=0.8,and the instantaneous lift coefficient and cloud cavitation evolution on the suction surface of the hydrofoil were obtained.By solving the spherical cavitation dynamics equation,the evolution pattern of cavitation dynamics in the cloud cavitation area of the hydrofoil was also acquired.The research results indicate that this numerical method effectively simulates the periodic behavior of cavitation in hydrofoils during the cloud cavitation.The intensity of the pressure on tracer particles along their paths is influenced by the position of cavitation shedding and collapse.The internal pressure of the cavitation is related to its subjected flow field pressure.The more drastic the flow field pressure change,the higher the amplitude of the internal pressure of the cavitation,and the larger the pressure wave released by its collapse.When the cavitation radius shrinks to 15.7μm,the maximum amplitude of its collapse pressure can reach 69.800 MPa.As the initial radius of the cavitation increases,the amplitude of cavitation internal pressure decreases,and the cavitation morphology remains basically stable.The research method in this paper can provide a theoretical reference for the study of spherical cavitation dynamics in other types of large hydraulic machinery.
作者
洪锋
郭泽霖
袁喜
刘书畅
黄笛
贾金平
雷恩宏
黄应平
HONG Feng;GUO Zelin;YUAN Xi;LIU Shuchang;HUANG Di;JIA Jinping;LEI Enhong;HUANG Yingping(College of Mechanical and Power Engineering,China Three Gorges University,Yichang,Hubei 443002,China;Engineering Research Center of Eco-environment in Three Gorges Reservoir Region,Ministry of Education,China Three Gorges University,Yichang,Hubei 443002,China;College of Hydraulic and Environmental Engineering,China Three Gorges University,Yichang,Hubei 443002,China;School of Environmental Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《排灌机械工程学报》
北大核心
2026年第2期148-155,共8页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(22136003)
湖北省自然科学基金资助项目(8246106)
三峡库区生态环境教育部工程研究中心(三峡大学)开放基金资助项目(KF2023-01)。
关键词
云空化
空泡动力学
Clark-Y水翼
大涡模拟
单向耦合
cloud cavitation
cavitation dynamics
Clark-Y hydrofoil
large-eddy simulation
one-way coupling
