Hydroelasticity effects induced by a single cavitation bubble collapse

IF 3.4 2区 工程技术 Q1 ENGINEERING, MECHANICAL Journal of Fluids and Structures Pub Date : 2024-05-28 DOI:10.1016/j.jfluidstructs.2024.104131
Hemant J. Sagar , Ould el Moctar
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Abstract

To investigate hydroelasticity effects on a single cavitation bubble dynamic, a focused laser was used to generate the bubble in water near a flexible aluminium foil fixed to a specimen holder with a circular aperture to allow the foil to vibrate. The bubble was generated below the foil's center. A laser-based optical sensor measured the displacement at the center of the foil. Simultaneously, a high-speed camera monitored the bubble's dynamics to correlate it with the foil's displacement. By directly measuring the foil's displacements, we provided building block missing in previous investigations. We found that a key difference between bubble dynamics near a rigid and an elastic structure was that, at relative wall distances larger or equal to unity, the bubble did not collapse on the elastic foil. The bubble's dynamics caused dominant foil displacements during its first growth (after plasma seeding) and during its subsequent collapse. Foil displacements during the bubble's first collapse were about twice as large as those during its growth phase. For lower relative wall distances, the induced foil displacements were significant until the bubble's third collapse. At larger relative wall distances, the bubble did not collapse on the elastic foil and, thus, it did not induce erosion. However, it caused foil vibrations and, therefore, may contribute to the foil's structural fatigue damage. Our study postulates that the cavitation may not be erosive, however it can induce impulsive loads causing vibrations and thereby fatigue damage of nearby structures.

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单个空化气泡坍塌引发的水弹性效应
为了研究水弹性对单个空化气泡动态的影响,使用聚焦激光在水中产生气泡,气泡靠近固定在试样支架上的柔性铝箔,试样支架上有一个圆形孔,允许铝箔振动。气泡在铝箔中心下方产生。激光光学传感器测量铝箔中心的位移。与此同时,高速摄像机监控气泡的动态,将其与箔片的位移相关联。通过直接测量箔片的位移,我们提供了以往研究中所缺少的构建模块。我们发现,刚性结构和弹性结构附近气泡动力学的一个关键区别在于,当相对壁距大于或等于统一时,气泡不会在弹性箔上塌陷。气泡的动力学在其第一次生长(等离子体播种后)和随后的坍塌过程中造成了主要的箔片位移。气泡第一次坍塌时的箔片位移大约是气泡生长阶段的两倍。对于较小的相对壁距,在气泡第三次坍塌之前,诱导的箔片位移一直很大。相对壁距较大时,气泡不会在弹性箔上塌陷,因此不会引起侵蚀。然而,气泡会引起箔片振动,因此可能导致箔片结构疲劳损坏。我们的研究推测,空化可能不具有侵蚀性,但会引起脉冲载荷,导致振动,从而对附近的结构造成疲劳破坏。
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来源期刊
Journal of Fluids and Structures
Journal of Fluids and Structures 工程技术-工程:机械
CiteScore
6.90
自引率
8.30%
发文量
173
审稿时长
65 days
期刊介绍: The Journal of Fluids and Structures serves as a focal point and a forum for the exchange of ideas, for the many kinds of specialists and practitioners concerned with fluid–structure interactions and the dynamics of systems related thereto, in any field. One of its aims is to foster the cross–fertilization of ideas, methods and techniques in the various disciplines involved. The journal publishes papers that present original and significant contributions on all aspects of the mechanical interactions between fluids and solids, regardless of scale.
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