自由液面附近空化泡的溃灭特性

发布时间：2018-05-22 15:46

本文选题：空化泡 + 自由液面　；参考：《水利学报》2017年02期

【摘要】：研究自由液面附近空化泡的溃灭特性对认识水利水电工程中的空蚀破坏机理具有重要意义。为进一步认识自由液面附近空化泡的溃灭特性,开展了电火花激发空化泡试验。结果表明:(1)空化泡与自由液面距离较近时总是背离自由液面溃灭,背离的临界条件为空化泡与自由液面的距离约是空化泡最大半径的5倍。空化泡尺寸越大或空化泡与自由液面距离越近,其背离现象越明显。(2)自由液面附近双空化泡相向溃灭融合,且融合体背离自由液面移动。(3)在自由液面和空气泡的共同影响下,空化泡的溃灭方向是二者分别对空化泡作用的矢量和。通过本文研究,对自由液面附近空化泡的溃灭有了定量认识,可以在一定条件下预测空化泡的溃灭方向。
[Abstract]:It is of great significance to study the collapse characteristics of cavitation bubbles near the free surface for understanding the mechanism of cavitation destruction in water conservancy and hydropower projects. In order to further understand the collapsing characteristics of cavitation bubbles near free liquid surface, the experiment of EDM induced cavitation bubble was carried out. The results show that the cavitation bubble is always away from the free surface when it is close to the free surface, and the critical condition is that the distance between the cavitation bubble and the free surface is about 5 times of the maximum radius of the cavitation bubble. The larger the cavitation bubble size is or the closer the cavitation bubble is to the free liquid surface, the more obvious the deviation is. (2) the double cavitation bubble collapses and melts around the free surface, and the fusion body moves from the free surface to the free surface. 3) under the influence of the free surface and the air bubble, The collapse direction of cavitation bubble is the vector sum of the effect of them on cavitation bubble. In this paper, the collapse of cavitation bubble near free liquid surface is quantitatively recognized, and the collapse direction of cavitation bubble can be predicted under certain conditions.
【作者单位】：四川大学水力学与山区河流开发保护国家重点实验室;
【基金】：国家重点基础研究计划973计划项目(2013CB035905) 国家自然科学基金项目(51179114)
【分类号】：TV131.3

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