Wu Zhangjun, Jin Dongyan, Yu Bingbing, Chen Shengyun, Deng Shuxin, Song Xianzhao, Yu Wenjun, Sui Yaguang, Wu Huajie, Shi Weizheng, Wang Mingyang
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
Institute of Defense Engineering, Academy of Military Sciences, Beijing, 100036, China.
Sci Rep. 2025 Apr 3;15(1):11468. doi: 10.1038/s41598-025-93836-2.
New types of explosives, such as fuel-air explosive (FAE), are capable of generating high pressure and have a long duration of action, which is extremely destructive to personnel and equipment in underground spaces. Chambers are one of the most commonly used shock waves attenuating protection structures in engineering. However, the effect of the duration of shock wave action on the wave attenuation capacity of chambers with asymmetric structures has not been studied. This study investigates the wave attenuation characteristics of a chamber with double-bend structures under varying durations and pressures using a self-developed shock tube. Utilizing space-time conservation element and solution element (CESE), the effects of structural dimensions, duration, and the pressure of the incident shock wave on the attenuation ratio are analyzed. The results indicate that an increase in the duration of the incident shock wave causes a significant decrease in the wave attenuation ratio. When the duration extends from 0.13 s to 1.55 s, the attenuation ratio declines by 35%. The influences of incident shock wave pressure and chamber size on the attenuation ratio are contingent upon the chamber's capacity to accommodate shock waves and airflows. When the incident shock wave surpasses the shock wave accommodation capacity of the given chamber size, the attenuation ratio may drop sharply, potentially becoming negative, indicating that the chamber effectively amplifies the incident shock wave. This study aims to provide valuable guidance for the design of chamber-type wave attenuation structures in protective engineering applications.
新型炸药，如燃料空气炸药（FAE），能够产生高压且作用时间长，对地下空间中的人员和设备具有极大的破坏力。防护室是工程中最常用的冲击波衰减防护结构之一。然而，冲击波作用时间对非对称结构防护室的波衰减能力的影响尚未得到研究。本研究使用自行研制的激波管，研究了双弯结构防护室在不同作用时间和压力下的波衰减特性。利用时空守恒元与解元（CESE）方法，分析了结构尺寸、作用时间和入射冲击波压力对衰减率的影响。结果表明，入射冲击波作用时间的增加会导致波衰减率显著降低。当作用时间从0.13 s延长到1.55 s时，衰减率下降了35%。入射冲击波压力和防护室尺寸对衰减率的影响取决于防护室容纳冲击波和气流的能力。当入射冲击波超过给定防护室尺寸的冲击波容纳能力时，衰减率可能会急剧下降，甚至可能变为负值，这表明防护室有效地放大了入射冲击波。本研究旨在为防护工程应用中防护室型波衰减结构的设计提供有价值的指导。
