The mechanism of liquid dispersing from a cylinder driven by central dynamic shock loading  

作　　者：Lei Li Xiao-xia Lu Xiao-bin Ren Ye-jun Ren Shou-tian Zhao Xiao-fang Yan 

机构地区：[1]State Key Laboratory of NBC Protection for Civilian,Beijing,102205,China [2]School of Aerospace Engineering,Tsinghua University,Beijing,100084,China

出　　处：《Defence Technology（防务技术）》2021年第4期1313-1325,共13页Defence Technology

基　　金：the support of National Nature Science Foundation of China, the support numbers are No. 10572149 and No.10676120;the National Key Research and Development program of China (subject no. 2017YFC0209901) for its support to the work of this paper

摘　　要：A systematic investigation on the mechanism of dynamic liquid dispersing process via theoretical and experimental approach is presented.The experiments include weak and strong constrained scenarios using the high-speed camera technique and the flash X-ray radiography technique.Based on dynamic analysis,one-dimensional characteristics analysis and some numerical simulations on the propagating processes of blast waves before the container shell rupturing,further and detailed analyses of the experimental results are presented.The effects of the liquid viscosity on the dynamic dispersing flow are also analyzed,and the spall fracture mechanism is explored.Thus,the dominating forces determining the dispersing liquid flow are revealed,that is,the stretching and shearing action due to the interaction of two reflecting rarefaction waves in opposite propagating directions.The influence of container shell strength on the dispersing liquid flow is also investigated,and the characters of cavitation layered in liquid before shell rupturing are uncovered.Results revealed that different shell material results in different cavitating layers.Then the different cavitating layers drive the different dynamic liquid dispersing process coming into being.The metastable liquid states caused by pressure drop and cavitation generation are discussed.

关 键 词：Shell effects Reflected rarefaction waves Liquid spall fracture Liquid dispersing Shock waves Cavitation layered 

分 类 号：O347.3[理学—固体力学]