Numerical Simulation and Experimental Tests on Explosively‐Induced Water Jet Phenomena

Abstract

This study addresses some aspects regarding water jet propulsion during high explosives detonation. A number of theoretical and experimental studies have shown that using Gurney equation and the relationships derived, one can provide fair results regarding initial velocity of metallic fragments for explosively‐driven metal casings. However, an investigation on Gurney equations utilization for the prediction of water velocity has not been performed yet. By carrying out simple experimental tests and numerical simulations, water has been investigated in terms of total mass average velocity and tip velocity. Based on the available data, the findings indicate that Gurney equations overestimate the water mass average velocity. For water tip velocity evaluation, further studies should be made.

Experimental Evaluation of the Factors That Influence Cylindrical Water Projection Devices against IEDs

“…This is supported by the literature, as Cherry [8] states that "depending on the configuration and the amount of explosive and fluid used, water is projected at the target that has sufficient energy to penetrate rigid enclosures from fairly long stand-off". Thus, "since the pressure induced in target materials is strongly connected to impact velocity, a special attention must be given to its evaluation" [10].…”

“…The few studies available are limited to directional water-jet propulsion devices. Enache et al [10] address the study of water-jet propulsion due to high explosive detonation. They evaluate the velocity of water when experimentally measured, as compared to the prediction given by the Gurney equation.…”

“…They evaluate the velocity of water when experimentally measured, as compared to the prediction given by the Gurney equation. However, as the authors rightly state, the "Gurney equation can provide fair results regarding initial velocity of metallic fragments for explosively driven metal casings" [10], but gives wrong predictions for the projected water front. Radomski [11] addresses the simulation of the internal ballistics of a two-chambered recoilless projected water disruptor.…”