不同驱动压力场对数值空蚀预测的影响分析  

Investigation on Influence of Driving Pressure Field Definition on Cavitation Erosion Prediction

作　　者：方海渊 张睿杰 曹彦涛 郑恩慧 张成华[3] 耿琳琳[1] Fang Haiyuan;Zhang Ruijie;Cao Yantao;Zheng Enhui;Zhang Chenghua;Geng Linlin(Research Center of Fluid Machinery Engineering and Technology,Jiangsu University,Zhenjiang 212013,China;National Key Laboratory on Ship Vibration and Noise,China Ship Scientific Research Center,Wuxi 214082,China;Asia-Pacific Pump&Valve Co.,Ltd,Taizhou 225403,China)

机构地区：[1]江苏大学流体机械工程技术研究中心,镇江212013 [2]中国船舶科学研究中心船舶振动噪声重点实验室,无锡214082 [3]江苏亚太泵阀有限公司,泰州225403

出　　处：《水动力学研究与进展（A辑）》2024年第5期696-705,共10页Chinese Journal of Hydrodynamics

基　　金：江苏省青年科学基金(BK20220538)。

摘　　要：为了评估驱动压力对于空化空蚀预测准确性的影响,该文采用密度修正的SST湍流模型及Sauer空化模型对扭曲水翼进行瞬态空化数值计算,通过对比空泡脱落频率及实验中空泡瞬态特征,验证了当前数值方法的准确性,并通过表征流场中空蚀能量密度及映射流场空蚀能量算法实现壁面空蚀强度预测。对比瞬时及累计壁面空蚀强度,发现采用时均压力场作为驱动压力能够获取空泡瞬态演化过程的壁面瞬时空蚀强度,且累加瞬态空蚀强度得到的易空蚀区域与实验空蚀结果更加吻合。同时发现,翼型中部被侵蚀区域与片状空穴尾缘溃灭及云状空穴向下游发展过程中的溃灭相关,而翼型尾缘中部零散分布的点蚀区域则主要与U型涡的溃灭密切相关。In order to evaluate the influence of driving pressure on the accuracy of erosion prediction,the density-corrected SST turbulence model and the Sauer cavitation model are used to simulate the transient cavitation around the twisted hydrofoil.The numerical simulation results are verified by comparing the cavitation shedding frequency and the transient characteristics of the cavitation in the experiment.In addition,the wall erosion load is predicted by defining the erosion energy density in the flow field and by mapping the erosion energy to the wall.According to the above investigation,it is found that using the time-averaged pressure field as the driving pressure can obtain more reasonable and more agreeable erosion results.Meanwhile,it is found that the main eroded area on the middle of the foil is related to the collapse of the sheet cavity trailing edge and the collapse of the cloud cavity in the downstream development process,while the scattered pitting area in the middle of the foil trailing edge is mainly related to the U-shapevortex collapse.

关 键 词：空化空蚀 瞬态空化 空蚀预测 壁面空蚀强度 时均压力场 

分 类 号：TK72[动力工程及工程热物理—流体机械及工程]