爆轰产物冲击带破口双层板结构内板壁压研究

Study on the Wall Pressure Generated by Detonation Products on the Inner Panel of a Double-layer Structure with a Hole

针对水下接触爆炸条件下爆轰产物冲击带破口双层板内板壁压载荷特性不清的问题,开展了理论和试验研究。将舱外附着气泡和爆轰产物气柱射流的演化过程分为3个阶段:1)气泡膨胀和爆轰产物从破口随进过程;2)爆轰产物形成气柱射流并在结构内运动过程;3)爆轰产物气柱射流冲击结构内板过程,构建了爆轰产物气体破口随进动力学方程组,给出了爆轰产物气体在结构内部运动时速度和密度的衰减规律,建立了爆轰产物冲击带破口双层板结构内板壁压的理论计算模型,并且分析了药量、破口半径和舱室宽度对气泡运动和内板壁压的影响规律。同时,开展了带破口双层板结构的水下接触爆炸试验,采用高速摄像拍摄了气泡和爆轰产物气柱的运动演化过程,测量获取了爆轰产物气柱射流作用在内板上的壁压时程。结果表明,壁压峰值和冲量的理论计算结果与试验测量结果的偏差分别为-5.84%和9.71%。理论计算模型精度满足工程应用要求,可为舰船结构的毁伤评估和抗爆设计提供理论基础。

To investigate the characteristics of wall pressure generated by detonation products on the inner panel of a double-layer structure with a hole,we conducted theoretical and experimental studies were conducted.The evolution process of the underwater contact explosion bubble and detonation product jet was divided into three stages:1)bubble expanding and detonation products entering through the hole,2)detonation product jet moving in the structure,and 3)detonation product jet impacting the inner panel.Dynamic equations of the detonation products passing through the hole were constructed,the attenuation laws of the velocity and density of detonation products moving in the structure were derived,and a theoretical calculation model for wall pressure on the inner panel of the double-layer structure was established.The effects of charge weight,break radius,and cabin width on bubble motion and wall pressure were analyzed.Additionally,an underwater contact explosion test on a double-layer structure was conducted.The evolution process of the explosion bubble and detonation product jet was photographed using a high-speed camera and the time history of wall pressure on the inner panel was recorded.The results indicate that the deviation in the peak pressure and impulse between the theoretical calculation results and test measurement results were−5.84%and 9.71%,respectively.The accuracy of the theoretical calculation model can meet the requirements of engineering applications,thereby providing a theoretical basis for the damage assessment and shock-resistant design of ship structures.