Study on the Wall Pressure Generated by Detonation Products on the Inner Panel of a Double-layer Structure with a Hole
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摘要: 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。Abstract: 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.
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[1] Best J P. On the Dynamics of the Bubble Created upon Detonation of a Limpet Mine:AR-009-924[R]. S.l.:s.n., 1997. [2] Dadvand A, Khoo B C C, Shervani-Tabar M T. A Collapsing Bubble-induced Microinjector:an Experimental Study[J]. Experiments in Fluids, 2008, 46(3):419-434. [3] Liu Y L, Wang S P, Zhang A M. Interaction between Bubble and Air-backed Plate with Circular Hole[J]. Physics of Fluids, 2016, 28(6):062105. [4] 张梁.水下接触爆炸对舰船舷侧多层防护结构毁伤机理研究[D].哈尔滨:哈尔滨工程大学, 2020. [5] 吴林杰,侯海量,朱锡,等.水下接触爆炸下防雷舱舷侧空舱的内压载荷特性[J].爆炸与冲击, 2017, 37(4):719-726.Wu Lin-jie, Hou Hai-liang, Zhu Xi, et al. Internal Load Characteristics of Broadside Cabin of Defensive Structure Subjected to Underwater Contact Explosion[J]. Explosion and Shock Waves, 2017, 37(4):719-726. [6] 陈莹玉.水下近场爆炸时不同结构形式的壁压与毁伤特性试验研究[D].哈尔滨:哈尔滨工程大学, 2019. [7] Fuster D, Dopazo C, Hauke G. Liquid Compressibility Effects during the Collapse of a Single Cavitating Bubble[J]. The Journal of the Acoustical Society of America, 2011, 129(1):122-131. [8] Prosperetti A, Lezzi A. Bubble Dynamics in a Compressible Liquid. Part 1. First-order Theory[J]. Journal of Fluid Mechanics, 1986, 168:457-478. [9] Lezzi A, Prosperetti A. Bubble Dynamics in a Compressible Liquid. Part 2. Second-order Theory[J]. Journal of Fluid Mechanics, 1987, 185:289-321. [10] Cole R H. Underwater Explosion[M]. New Jersey:Princeton University Press, 1948:61-64. [11] Kedrinskii V X. Hydrodynamics of Explosion:Experiments and Models[M]. Berlin Heidelberg:Springer, 2005:12-30. [12] Fujikawa S, Akamatsu T. Effects of the Non-equilibrium Condensation of Vapour on the Pressure Wave Produced by the Collapse of a Bubble in a Liquid[J]. Journal of Fluid Mechanics, 1980, 97(3):481-512. [13] Zhang J X, Wang S S, Jia X Y, et al. An Engineering Application of Prosperetti and Lezzi Equation to Solve Underwater Explosion Bubbles[J]. Physics of Fluids, 2021, 33(1):017118. [14] Schlichting H. Boundary Layer Theory[M]. New York:McGraw Hill Book Company, 1979. [15] Plesset M S. Collapse of an Initially Spherical Vapor Cavity in the Neighborhood of a Solid Boundary[J]. Journal of Fluid Mechanics, 1971, 47:283-290.
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