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An Experimental Approach to the Measurement of Wall Pressure Generated by an Underwater Spark-Generated Bubble by a Hopkinson Bar

机译：Hopkinson BAR由水下火花产生的泡沫产生的壁压测量的实验方法

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摘要

The wall pressure loading due to the underwater spark-generated bubble, having served as an efficient technique to study the underwater explosion, has drawn much attention. Compared with the numerical study of the pressure characteristics, the direct experimental investigation is much rarer. Recently, an improved pressure-measuring system by using a Hopkinson pressure bar as the sensing element is proposed, set up, and validated by the current authors. In this article, the improved methodology and experimental system is used to detect and analyze the pressure loading on the target plate surface due to the underwater spark-generated bubble beneath the plate. A series of experiments with 3?mm, 5?mm, 10?mm, 15?mm, …, 60?mm standoffs are carried out. The experimental results and the related analysis and discussions are presented. Based on the results, the improved methodology can be used to detect the pressure loading due to the spark-generated bubble. There is multipeak oscillation near the peak of the shock pressure loading profile. The peak pressure versus the standoff is also summarized. According to the characteristics of the induced water jet pressure and the bubble-collapse pressure loading given in this article, enough attention should be paid to not only the jet and the first bubble-collapse pressure loadings but also the secondary bubble-collapse pressure loadings especially when the dimensionless distance γ1.
机译：由于水下的泡沫引起的壁压负荷，曾担任研究水下爆炸的有效技术，引起了很多关注。与压力特性的数值研究相比，直接实验研究很罕见。最近，提出了通过使用Hopkinson压力棒作为传感元件的改进的压力测量系统，由当前作者建立并验证。在本文中，改进的方法和实验系统用于检测和分析板表面上的压力负荷，由于板下方的水下火花产生的气泡。一系列3？mm，5？mm，10？mm，15Ωmm，...，60？mm支架的一系列实验。提出了实验结果和相关分析和讨论。基于结果，改进的方法可用于检测由于火花产生的泡沫引起的压力负荷。震动压力负荷概况的峰值附近有多个跳跃振荡。还总结了峰值压力与支架相比。根据诱导的水射流压力和本文给出的气泡塌陷压力载荷的特点，应足够的重视，不仅应该支付给射流和第一气泡塌陷的压力载荷，而是尤其是二次泡沫塌陷的压力载荷当无量纲距离γ> 1时。

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