刚性和柔性多孔材料作用下氢气爆轰胞格结构的演化规律  

Evolution Law of Hydrogen Detonation Cellular Structure under the Effect of Rigid and Flexible Porous Materials

作　　者：罗荣钦 彭澳 张静雯[1] 王珺[1] 陈先锋[1] 申利远 师吉浩 孙绪绪 LUO Rongqin;PENG Ao;ZHANG Jingwen;WANG Jun;CHEN Xianfeng;SHEN Liyuan;SHI Jihao;SUN Xuxu(School of Safety Science and Emergency Management,Wuhan University of Technology,Wuhan 430070,Hubei,China;China Fire and Rescue Institute,Beijing 102220,China;Department of Building Environment and Energy Engineering,The Hong Kong Polytechnic University,Hong Kong ZS843,China)

机构地区：[1]武汉理工大学安全科学与应急管理学院,湖北武汉430070 [2]中国消防救援学院,北京102220 [3]香港理工大学建筑环境与能源工程系,中国香港ZS843

出　　处：《高压物理学报》2024年第3期181-190,共10页Chinese Journal of High Pressure Physics

基　　金：湖北省重点研发“揭榜挂帅”科技项目(2022BEC024);广东省自然科学基金(2023A1515012080);国家自然科学基金(12302443);国家重点研发计划(2021YFB4000901);火灾与爆炸安全防护重庆市重点实验室开放基金(LQ22KFJJ06);中央高校基础研究项目(223161001);中国民航大学民航热灾害防控应急重点实验室开放基金(RZH2021-KF-05);中国科学技术大学火灾科学国家重点实验室开放基金(HZ2022-KF09)。

摘　　要：多孔材料作为高效吸波耗能介质,广泛应用于爆轰衰减研究中。为进一步揭示多孔材料的抑爆机理,系统研究了柔性(海绵)和刚性(金属丝网)2种典型多孔材料对氢氧爆轰胞格结构的影响,以及海绵和金属丝网厚度、孔隙率对爆轰胞格结构、尺寸等参数的影响。采用烟熏板技术记录爆轰波的胞格图案,并计算得到爆轰胞格尺寸;采用压力传感器记录爆轰波到达时间,进而计算得到爆轰波的平均传播速度。结果表明,爆轰胞格结构与海绵和金属丝网的厚度、孔隙率密切相关,此外研究发现了多个爆轰传播阶段,包括爆轰失效、加速和再起爆。爆轰胞格尺寸也与海绵和金属丝网的厚度、孔隙率密切相关,增大多孔材料厚度和减小孔隙率均能显著增大爆轰胞格尺寸。通过对比分析海绵与金属丝网对爆轰胞格尺寸的影响发现,在相同条件下,刚性多孔材料对爆轰的抑制作用更强,但这种差距会随着多孔材料厚度的增加而减小。最后,通过引入无量纲参数D_(H)/λ量化分析爆轰传播极限。对于柔性和刚性多孔材料而言,其爆轰传播极限可分别近似量化为D_(H)/λ≈3.0和D_(H)/λ≈3.1。As highly efficient absorbing and dissipating materials,porous materials were widely used in the study of detonation wave attenuation.In order to further explore the mechanism of explosion suppression by porous materials,the effects of typical flexible(sponge)and rigid(wire mesh)porous materials on the detonation cellular structure for hydrogen and oxygen mixture were investigated systematically.The effects of thickness and porosity of sponge and wire mesh on the structure and size of detonation cell were discussed in detail.The cellular pattern of detonation wave was recorded by using smoke plate technology,and the cell size was calculated.The pressure sensors were used to record the arrival time of the detonation wave,and the average propagation velocity of detonation wave was obtained.The results show that the detonation cellular structure closely depends on the thickness and porosity of sponge and wire mesh,and three phases of the propagation can be observed in the tube,including detonation failure,acceleration and re-initiation.In addition,size of the detonation cell is also closely related to the thickness and porosity of sponge and wire mesh.Increasing the thickness of porous materials and decreasing the porosity both can increase the size of the detonation cell.By comparing the effects of sponge and wire mesh on the detonation cellular structure,it can be found that at the same initial condition,the rigid porous material has a stronger inhibition effect on detonation.But the difference will be gradually decreased with the increase of the thickness of the porous materials.Finally,the limit of the detonation propagation is analyzed quantitatively by introducing the dimensionless parameter D_(H)/λ.For flexible and rigid porous materials,the detonation limit can be nearly quantified as D_(H)/λ≈3.0 and D_(H)/λ≈3.1.

关 键 词：爆轰胞格结构 柔性多孔材料 刚性多孔材料 爆轰极限 氢气 

分 类 号：O381[理学—流体力学]