非等径爆炸抛洒装置燃料抛撒特性影响规律研究

Study on the influence law of fuel dispersion characteristics of non-equal diameter explosive sprinkling device

研究非等径异形抛撒装置的燃料抛洒特性,利用LS-DYNA软件模拟锥柱状扇形抛洒装置中心药起爆至壳体破裂过程,得到燃料抛洒速度在壳体表面的分布和抛撒速率随时间的变化规律,将其结果和实验进行对比验证。同时通过改变中心药柱点火位置,壳体厚度和壳体材料,研究这些因素变化对燃料抛撒初速度的影响规律。分析结果得出如下结论:①点火位置在壳体粗端,即中心抛撒药从粗端起爆时,能弥补非等经结构内燃料装药不均匀带来的抛撒不均匀问题,同时能使燃料抛撒初速度比细端起爆条件下高出7%。②壳体厚度对燃料抛洒出速度分布规律无明显影响,壳体厚度增大一倍,燃料抛撒初速度减小约12.5%。③壳体材料对燃料抛撒初速度和分布规律均有影响,韧性材料对燃料抛洒初速度分布规律影响不大,但是对初速率大小有影响,陶瓷等脆性材料导致初速度分布得更均匀。

In this paper,the fuel dispersion characteristics of non-equal diameter explosive sprinkling device are studied.LS-DYNA software is used to simulate the process from central charge initiation to shell rupture of a cone cylindrical fan spraying device.The distribution of fuel spraying velocity on the surface of the shell and the variation law of the spraying rate with time are obtained.At the same time,by changing the ignition position of the central propellant column,shell thickness and shell material,the influence of these factors on the initial velocity of fuel spraying is studied.The results show:①When the ignition position is at the rough end of the shell,that is,when the central propellant is fired from the rough end,it can make up for the uneven dispersion problem caused by the uneven fuel charge in the non-uniform structure,and make the initial fuel dispersion velocity 7%higher than that under the condition of fine end initiation.②The shell thickness has no obvious influence on the distribution law of fuel release velocity.Doubling the shell thickness reduces the initial velocity of fuel dispersion by about 12.5%.③Shell materials have an influence on both the initial velocity and distribution law of fuel scattering.Ductile materials have little influence on the initial velocity distribution law of fuel scattering,but have an influence on the initial velocity size.Brittle materials such as ceramics lead to a more uniform initial velocity distribution.