Abstract The wall pressure caused by underwater explosion is always a key problem in the anti-explosion design of naval ships. Notably, the accurate wall pressure caused by underwater explosion bubble is one of the most difficult parts due to the significant nonlinear deformation of the bubble. In present study, the dynamics of an underwater explosion bubble near a rigid wall are captured by high-speed camera and the wall pressure in the wall center are measured by a pressure transducer. The wall pressure with standoff distance parameter γ = d / R m from 0.38 to 1.54 are recorded, where d represents the vertical distance from the explosive charge center to the wall center, and R m is the maximum radius of bubble. According to the previous study and the experimental data in this paper, when γ 1.2 , the load on the wall center has obvious double-peak phenomenon, that is, the composition of the re-entrant jet load and the bubble collapse load. To obtain the quantitative law of wall pressure caused by mini-charge underwater explosion bubble, we proposed a mathematical model to describe the time-pressure curve when γ 1.2 . And according to the conclusion in our previous study (Chen et al., 2018), based on the boundary element method (BEM), the space distribution of the wall pressure was obtained.

中文翻译：

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微装药水下爆炸泡引起的壁压定量规律研究

摘要 水下爆炸引起的壁面压力一直是舰船防爆设计中的关键问题。值得注意的是，由于气泡的显着非线性变形，水下爆炸气泡引起的精确壁压力是最困难的部分之一。在目前的研究中，靠近刚性壁的水下爆炸气泡的动力学由高速摄像机捕获，壁中心的壁压力由压力传感器测量。记录距离参数 γ = d / R m 从 0.38 到 1.54 的壁压力，其中 d 表示炸药中心到壁中心的垂直距离，R m 是气泡的最大半径。根据前人的研究和本文的实验数据，当 γ 1.2 时，壁面中心载荷有明显的双峰现象，即折返射流载荷和气泡坍塌载荷的合成。为了得到微量装药水下爆炸气泡引起的壁面压力的定量规律，我们提出了一个数学模型来描述γ 1.2 时的时间-压力曲线。并且根据我们之前的研究（Chen et al., 2018）的结论，基于边界元法（BEM），得到了壁面压力的空间分布。