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The mechanism of liquid dispersing from a cylinder driven by central dynamic shock loading
Defence Technology ( IF 5.1 ) Pub Date : 2020-07-09 , DOI: 10.1016/j.dt.2020.07.001
Lei Li , Xiao-xia Lu , Xiao-bin Ren , Ye-jun Ren , Shou-tian Zhao , Xiao-fang Yan

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.



中文翻译:

中心动态冲击载荷驱动的圆柱体液体分散机理

通过理论和实验方法对动态液体分散过程的机理进行了系统研究。实验包括使用高速相机技术和闪光 X 射线摄影技术的弱约束和强约束场景。在动力分析、一维特性分析和一些数值模拟的基础上,对容器壳破裂前冲击波的传播过程进行了进一步详细的分析。还分析了液体粘度对动态分散流的影响,并探讨了剥落破裂机制。因此,揭示了决定分散液体流动的主导力量,即,由于两个传播方向相反的反射稀疏波的相互作用而产生的拉伸和剪切作用。还研究了容器壳强度对分散液流动的影响,揭示了壳破裂前在液体中分层的空化特征。结果表明,不同的壳材料导致不同的空化层。然后不同的空化层驱动不同的动态液体分散过程应运而生。讨论了由压降和空化产生引起的亚稳态液体。结果表明,不同的壳材料导致不同的空化层。然后不同的空化层驱动不同的动态液体分散过程应运而生。讨论了由压降和空化产生引起的亚稳态液体。结果表明,不同的壳材料导致不同的空化层。然后不同的空化层驱动不同的动态液体分散过程应运而生。讨论了由压降和空化产生引起的亚稳态液体。

更新日期:2020-07-09
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