凹坑曲率对近壁单空泡溃灭动力学特性的影响  

Effect of pit curvature on kinetic properties of near-wall single vacuole collapse

作　　者：韩伟[1] 郝英剑 李仁年[1] 任嘉乐 黄心愿 HAN Wei;HAO Yingjian;LI Rennian;REN Jiale;HUANG Xinyuan(College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050

出　　处：《浙江大学学报（工学版）》2024年第10期2111-2118,共8页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(52179086,52269022);景泰川电力灌溉工程大型梯级泵站改造关键技术研究.

摘　　要：空蚀导致流体机械壁面出现凹坑,影响流体机械壁面周围的流场,使附近的空泡溃灭过程复杂.基于欧拉方法模拟凹坑壁面附近空泡溃灭过程,分析球形空泡在不同壁面曲率下的动力学特性.结果表明,空泡溃灭时间与凹坑相对曲率呈指数函数关系,与空泡近壁系数呈线性关系且单调递减;空泡射流马赫数与凹坑相对曲率呈线性关系且单调递减,与空泡近壁系数呈线性关系且单调递增;冲击载荷与空泡溃灭时间呈二次函数关系且单调递减,与凹坑相对曲率和空泡近壁系数呈线性关系且单调递减.Cavitation erosion will lead to pits with different curvatures on the wall of fluid machinery,which will affect the flow field around the wall of fluid machinery and make the collapse process of the nearby vacuole complex.The process of vacuole collapse near a pit wall was simulated based on the Euler-Euler method,and the dynamic characteristics of the spherical vacuole under different wall curvatures were analyzed.Results show that the vacuole collapse time increases exponentially with the relative pit curvature and decreases monotonically with the near-wall coefficient of the vacuole in a linear function,while the Mach number of the vacuole jet decreases monotonically with the relative pit curvature and increases monotonically with the near-wall coefficient of the vacuole in a linear function.The impact load decreases monotonically with the vacuole collapse time in a quadratic function,and decreases monotonically with the relative pit curvature and the near-wall coefficient of the vacuole in a linear function.

关 键 词：空泡动力学 凹坑相对曲率 射流速度 冲击载荷 空泡溃灭 

分 类 号：TK72[动力工程及工程热物理—流体机械及工程]