Experimental Research on the Influence of Different Curved Rigid Boundaries on Electric Spark Bubbles.
Experimental Research on the Influence of Different Curved Rigid Boundaries on Electric Spark Bubbles.
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不同弯曲刚性边界对电火花气泡影响的实验研究
DOI：
10.3390/ma13183941
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发表时间：
2020-09-06
期刊：
影响因子：
--
通讯作者：
Wang M
中科院分区：
文献类型：
--
作者：
Ma C;Shi D;Chen Y;Cui X;Wang M
众所周知，空泡的动力学特性和载荷特性在很大程度上取决于它们与边界的接近程度。本研究旨在探讨边界曲率与气泡动力学的关系，以及载荷特性，并总结相关变化规律。本研究以三个不同曲率的半球和一个平板为主要研究边界。选择半球作为曲面边界，因为半球代表最简单类型的曲面边界。该方法可以方便地观察实验结果，总结气泡动力学和负载特性的变化规律。本实验使用400 V的高压电产生稳定且可重复的电火花气泡。由于气泡的脉动时间非常短，我们使用高速相机来获取必要的照片。我们还使用了霍普金森杆（HPB）来测量气泡崩溃的负载。假设曲率的无量纲参数为λ，爆炸距离的无量纲参数为γ。通过总结不同γ和γ组合下的44组实验结果，发现γ对空泡动力学和载荷特性有影响。随着雷诺数的增加，冲击波载荷和气泡破裂载荷减小。此外，在载荷特性方面，进一步验证了冲击波载荷和气泡溃灭载荷随γ的变化趋势。对于气泡的收缩形状，本文阐述了气泡的收缩形状与收缩速度的关系。总结了四种典型的气泡收缩形态。利用实验结果初步探讨了不同的γ值和γ值对射流的影响，并结合实验结果讨论了气泡第一脉动周期时间的发展趋势。
It is well known that the bubble dynamics and load characteristics of cavitation bubbles depend to a great extent on their proximity to the boundary. The purpose of this study is to explore the relationship between the boundary curvature and bubble dynamics, as well as the load characteristics, and summarize the relevant change laws. This study takes three hemispheres of different curvatures and one flat board as its main research boundaries. The hemisphere was chosen as the curved surface boundary because the hemisphere represents the simplest type of curved surface boundary. This method allowed us to easily observe the experimental results and summarize the change laws of bubble dynamics and load characteristics. A high voltage electricity of 400 V was used to produce stable and repeatable electric spark bubbles in this experiment. Since the pulsation time of the bubbles is very short, we used a high-speed camera to acquire the necessary photographs. We also used a Hopkinson bar (HPB) to measure the bubble collapse load. Suppose that the dimensionless parameter of curvature is ζ and the dimensionless parameter of the explosion distance is γ. By summarizing the 44 groups of the experimental results under different combinations of ζ and γ, we found that the cavitation bubble dynamics and loading characteristics are affected by ζ. With an increase of ζ, the shockwave load and bubble collapse load will decrease. In addition, in terms of load characteristics, this study further verified the change trend of the shockwave load and bubble collapse load with γ. For the bubble shrink shape, this paper illustrates the relationship between the bubble’s shrink shape and its shrinkage speed. Four typical bubble shrink shapes are summarized. The effects of different ζ and γ values on the jet are preliminarily explored using the experimental results, and, by considering the experimental results, the developmental trends of the time of the bubble’s first pulsation period are discussed.
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影响因子：
3.7
作者：
BEST, JP;BLAKE, JR
通讯作者：
BLAKE, JR
水下爆炸气泡引起的壁压力的数值和实验研究
影响因子：
--
作者：
Chen, Yingyu;Yao, Xiongliang;Cui, Xiongwei
通讯作者：
Cui, Xiongwei
影响因子：
3.7
作者：
Philipp, A;Lauterborn, W
通讯作者：
Lauterborn, W
影响因子：
3.2
作者：
Klaseboer, E;Khoo, BC
通讯作者：
Khoo, BC
影响因子：
3.4
作者：
Luo, Jing;Xu, Weilin;Zhang, Qi
通讯作者：
Zhang, Qi