水雾对爆炸冲击波衰减效应的实验研究  

Experimental study on mitigation effects of water mist on blast wave

作　　者：赵家兴 李奇 张亮 刘凇含 姜林 ZHAO Jiaxing;LI Qi;ZHANG Liang;LIU Songhan;JIANG Lin(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China;713th Research Institute of China State Shipbuilding Corporation Limited,Zhengzhou 450015,Henan,China)

机构地区：[1]南京理工大学机械工程学院,江苏南京210094 [2]中国船舶集团有限公司第七一三研究所,河南郑州450015

出　　处：《爆炸与冲击》2023年第10期172-182,共11页Explosion and Shock Waves

基　　金：国家重点研发计划(2020YFC1522800);国家自然科学基金(52176114,52111530091)。

摘　　要：为了探究水雾特性与爆炸载荷衰减效果之间的关系,在爆炸驱动的激波管内两种不同特性的水雾环境下进行了不同强度的爆炸实验,并评估了两种水雾对爆炸冲击波超压和比冲量的衰减效果。实验结果表明:喷雾区域内的压力分为两个上升阶段,第一个阶段为透射冲击波的压力,第二个阶段为液滴二次雾化和弛豫过程导致的压力上升;冲击波掠过的喷雾区域越长,水雾对压力峰值和比冲量的衰减效果越好;冲击波强度的增加将削弱水雾对爆炸载荷的衰减效果;Sauter平均直径为136.04μm、体积分数为1.72×10^(-3)的水雾使压力峰值衰减了34.2%~60.9%,使比冲量衰减了9%到54%;Sauter平均直径为255.34μm、体积分数为3.43×10^(-3)的水雾使压力峰值衰减了48.4%~78.6%,使比冲量衰减了14%~66%;冲击波压力峰值的衰减率随着冲击波-雾滴之间的比例交换面积增加而线性减少。To examine the mitigation characterisitics of blast wave in water mist,a comprehensive series of blast experiments were carried out utilizing a blast-driven shock tube with a 4 m length and 180 mm square inner cross-section.The blast wave was generated by detonating trinitrotoluene charges with masses of 7,10 and 13 g within the shock tube.Five pressure gauges were installed to measure blast wave pressure within the spray region.In order to create varying water mist properties,a spray system was employed,which covered a distance of 3 m within the experimental setup.Droplet size and distribution were measured using a laser light scattering analyzer.The mitigation effect of water mist with two distinct properties on blast overpressure and impulse was evaluated.Results indicated that the pressure in the spray region raised in two stages.The first stage corresponded to the pressure associated with the transmitted shock wave,while the second stage was attributed to the secondary atomization and relaxation processes of the droplets.The longer the spray region traversed by the blast wave,the greater the mitigation effect on peak overpressure and impulse.Increased shock wave intensity diminished the mitigation effect of water mist on blast loads.Specifically,when water mist with a Sauter mean diameter of 136.04μm and a volume fraction of 1.72×10^(−3)was employed,peak pressure values experienced a reduction ranging from 34.2%to 60.9%,while impulse values were reduced by 9%to 54%.On the other hand,when water mist with a Sauter mean diameter of 255.34μm and a volume fraction of 3.43×10^(−3)was used,peak pressure values witnessed a reduction ranging from 48.4%to 78.6%,and impulse values were reduced by 14%to 66%.The mitigation coefficient of peak overpressure decreased linearly with increased scaled exchange surface area between blast wave and droplets.

关 键 词：冲击波 水雾 爆炸衰减 超压 冲量 

分 类 号：O383[理学—流体力学]