凹坑曲率对近壁单空泡溃灭动力学特性的影响

doi:10.3785/j.issn.1008-973X.2024.10.015

浙江大学学报(工学版)

2024, Vol. 58

Issue (10): 2111-2118 DOI: 10.3785/j.issn.1008-973X.2024.10.015

机械工程、能源工程

凹坑曲率对近壁单空泡溃灭动力学特性的影响

韩伟(

),郝英剑,李仁年,任嘉乐,黄心愿

兰州理工大学能源与动力工程学院，甘肃兰州 730050

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

Wei HAN(

),Yingjian HAO,Rennian LI,Jiale REN,Xinyuan HUANG

College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China

全文: PDF(1752 KB) HTML

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.

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

Abstract:

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.

Key words: vacuole dynamics relative pit curvature jet velocity impact load vacuole collapse

收稿日期: 2023-08-08 出版日期: 2024-09-27

CLC:

TK 72

基金资助: 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.

作者简介: 韩伟（1977—），男，教授，从事流体机械及其多相流理论研究. orcid.org/0000-0001-8608-6519. E-mail：hanwei@lut.edu.cn

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引用本文:

韩伟,郝英剑,李仁年,任嘉乐,黄心愿. 凹坑曲率对近壁单空泡溃灭动力学特性的影响[J]. 浙江大学学报(工学版), 2024, 58(10): 2111-2118.

Wei HAN,Yingjian HAO,Rennian LI,Jiale REN,Xinyuan HUANG. Effect of pit curvature on kinetic properties of near-wall single vacuole collapse. Journal of ZheJiang University (Engineering Science), 2024, 58(10): 2111-2118.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2024.10.015 或 https://www.zjujournals.com/eng/CN/Y2024/V58/I10/2111

图 1 不同凹坑相对曲率下次Bjerknes力随空泡溃灭过程的变化

图 2 不同凹坑相对曲率下阻力随空泡溃灭过程的变化

图 3 壁面参数示意图

表 1 单空泡性能特性参数

图 4 凹坑壁面示意图

图 5 计算域和网格划分示意图

图 6 不同网格方案下空泡半径随时间的演化

图 7 空泡形态演变的实验及数值模拟图(ξ=0.3, γ=1.5)

图 8 不同凹坑相对曲率下的空泡溃灭时间

图 9 不同凹坑相对曲率下射流对空泡形态的影响(τ=5.95)

图 10 不同凹坑相对曲率的射流速度(τ=5.95)

图 11 壁面中心压力冲击载荷

图 12 壁面中心冲击载荷的时间历程(ξ=0.5, γ=1.2)

图 13 壁面附近压力波的传播过程(ξ=0.5, γ=1.2)

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