波浪对水翼非稳态空泡流动特性的影响研究  

Study of the influence of water wave on the unstable cavitating flow of a hydrofoil

作　　者：程闻[1] 鲁传敬[1,2] 曹嘉怡[1] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240 [2]上海交通大学海洋工程国家重点实验室,上海200030

出　　处：《水动力学研究与进展（A辑）》2011年第6期763-769,共7页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金重点项目(10832007);上海市重点学科建设项目(B206)资助

摘　　要：基于雷诺平均Navier-Stokes方程、Singhal-Et-Al全空化模型和修正的RNG k?ε湍流模型的VOF多相流动数学模型,采用PISO算法的有限体积法和数值水池技术,对波浪作用下NACA0012水翼的非稳态空泡流动特性进行了数值研究,分析了波高和水翼浸深对水翼非稳态空泡的形态演化和脱落频率的影响。计算结果表明:空泡非稳态周期性脱落频率随波高的增加而增加,随水翼浸深的增加而逐渐减小。与无波情况相比,空泡在波谷处提前断裂,空泡形态也因为波谷下方速度场的影响而向上鼓起。由于自由液面的界面效应,空泡形态较无界情况偏扁,并且液面对脱落涡系有吸引作用。The VOF multiphase flow model is established based on the RANS equations,the Singhal–Et–Al full cavitation model and the modified RNG turbulence model.The numerical simulations are conducted by using PISO algorithm of FVM and numerical wave tank to study the influence of water wave on the unstable cavitating flow of a NACA0012 hydrofoil.The effects of wave height and hydrofoil depth on the evolution of cavity configuration and the shedding frequency of the unstable cavitation of hydrofoil are analyzed.The present results show that the cavitation shedding frequency increases with the increase of wave height,but decreases with the increase of the hydrofoil depth.Comparing to the flow cases without wave,the cavity tends to break in wave trough and fall off early and the cavity configuration is gibbous which is caused by the velocity field under the wave trough.Due to the free surface effects,the cavity shape is a little flatter and the shedding vortexes are attracted by the water surface.

关 键 词：水翼 空泡流 非稳态现象 波浪作用 

分 类 号：O352[理学—流体力学]