Effect of Liquid Parameters on Protective Performance of a Liquid Composite Target Subjected to Jet Impact

Abstract

In order to study the influence of liquid parameters on the protective performance of liquid composite targets (LCT), based on the theory of interaction between the jet and the LCT, three dimensionless numbers - C, G, and V - are obtained by dimensional analysis in this paper. These 3 dimensionless parameters represent the compressibility, inertia, and viscosity of the liquid, respectively. The empirical formula, P/H = 0.346C1.251G−0.7120V0.036, was obtained by fitting experimental data of the static depth of penetration (DOP) experiment which can predict the residual depth of penetration (RDOP) of the jet penetrating the LCT. It turns out that the 2 dimensionless parameters - C and G - which characterize the compressibility and inertia of the liquid, plays a decisive role in the protection performance of the LCT, while the influence of liquid viscosity is small. In addition, according to the research results of this paper, the protective performance of the LCT can be improved by selecting a liquid with high sound velocity, high viscosity, and low density.

Study on cone angle of shockwave front in liquid composite protective structure

“…Zhang proposes that the interference of liquid on jet stability originates from both the radial convergent backflow of the liquid and the liquid spray (Zhang et al 2017). Tan and Zu conducted dimensional analysis and static jet impact tests to investigate the relationship between the residual penetration capability of a shaped charge jet and the sound speed, viscosity, and density of the liquid (Tan et al 2019. Guo et al considered the multiple impacts of the jet on the liquid and proposed that the liquid backflow caused by bottom reflection and cavity wall reflection interfered with the middle and rear segments of the shaped charge jet, respectively.…”