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引用次数: 0
摘要
实验研究了固体边界附近多个火花产生的气泡之间的相互作用。定性研究采用高速成像技术来观察气泡形状的演变，并采用 PVDF 传感器来测量冲击力。类似大小的气泡同步产生，气泡或边界之间的距离尽可能小。两个水平排列的气泡的喷射方向受边界附近的邻近参数 (γ) 的影响很大。此外，还介绍了气泡间距 (η) 的作用及其对冲击力强度的影响。研究发现，当 η 值较小时，水平气泡对的冲击力最大，而垂直气泡对和对角气泡对的冲击力最小。三个气泡排列在一起，中间一个气泡比左右两个气泡小、相似或大。在所有情况下，将较大的气泡置于中间确实会对边界产生最大的破坏性影响。此外，在本研究中应用的各种无量纲参数组合下，气泡变形特征各不相同。
Impact load measurement of small multi-bubble explosions near solid wall
The interaction of multiple spark-generated bubbles near solid boundary is investigated experimentally. Qualitative study is done with high-speed imaging for bubble shape evolution and PVDF sensor for impact force measurement. Similar-sized bubbles are created synchronously and distance between bubbles or boundary is chosen to be as small as possible. The jet direction of two horizontally aligned bubbles is strongly influenced by proximity parameter (γ) near boundary. The role of inter bubble distance (η) between bubbles and its contribution to intensity of impulsive force is also presented. It is found that strongest impact is recorded for horizontal pair, compared to vertical pair and diagonal pair, for small η values. Three bubbles are arranged with middle one which is smaller, similar or bigger than left and right bubbles. Allocating bigger bubble in the center indeed produces the most destructive impact on boundary among all cases. Moreover, diverse bubble deformation features are witnessed for various combination of dimensionless parameter applied in this study.
期刊介绍：
International Journal of Naval Architecture and Ocean Engineering provides a forum for engineers and scientists from a wide range of disciplines to present and discuss various phenomena in the utilization and preservation of ocean environment. Without being limited by the traditional categorization, it is encouraged to present advanced technology development and scientific research, as long as they are aimed for more and better human engagement with ocean environment. Topics include, but not limited to: marine hydrodynamics; structural mechanics; marine propulsion system; design methodology & practice; production technology; system dynamics & control; marine equipment technology; materials science; underwater acoustics; ocean remote sensing; and information technology related to ship and marine systems; ocean energy systems; marine environmental engineering; maritime safety engineering; polar & arctic engineering; coastal & port engineering; subsea engineering; and specialized watercraft engineering.
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