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

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

Journal of ZheJiang University (Engineering Science)

2024, Vol. 58

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

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

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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

Received: 08 August 2023 Published: 27 September 2024

CLC:

TK 72

Fund: 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.

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	Wei HAN
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	Xinyuan HUANG

Cite this article:

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.

URL:

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

凹坑曲率对近壁单空泡溃灭动力学特性的影响

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

Fig.1 Change of Bjerknes force with vacuole collapse process under different relative pit curvature

Fig.2 Changes of resistance with vacuole collapse process under different relative pit curvature

Fig.3 Wall parameters diagram

Tab.1 Characteristic parameters of single vacuole performance

Fig.4 Schematic diagram of pit wall

Fig.5 Schematic diagram of calculation domain and grid division

Fig.6 Evolution of vacuole radius with time under different mesh scheme

Fig.7 Experimental and numerical simulation of vacuole morphology evolution (ξ=0.3, γ=1.5)

Fig.8 Vacuole collapse time under different relative pit curvature

Fig.9 Effect of jet on vacuole morphology with different relative pit curvature (τ=5.95)

Fig.10 Jet velocity with different relative pit curvature (τ=5.95)

Fig.11 Impact load of wall center pressure

Fig.12 Time course of impact loads at wall center (ξ=0.5, γ=1.2)

Fig.13 Propagation process of pressure wave near wall (ξ=0.5, γ=1.2)


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