摘要
为了研究复合射孔爆炸与燃烧机理,建立了复合射孔有限元模型,利用LS_DYNA软件对模型进行了显性动力学数值计算,得出了射孔弹爆炸后枪身内产生的压力、温度分布情况。射孔弹爆炸后枪身内的压力和温度呈非均匀分布;时间越长、距起爆点距离越远时,冲击波、稀疏波在空气介质中形成的压力值越小。对弹间火药进行了冲击敏感性实验和热点火实验,在实验基础上,联系数值分析结果确定了枪身内火药的点火方式。通过实验得出弹间火药的热点温度在300～350℃之间;冲击敏感性为2.07～2.65GPa,延迟期为4μs。分析了枪身内射孔弹爆炸与火药燃烧耦合作用下火药燃烧性能和枪身内的压力的变化规律。火药的燃烧速度随压力、温度的升高而增快。p-t显示研究得出的复合射孔爆炸与燃烧机理具有较高的准确性。
To study the mechanism of explosion and combustion of gunpowder inside the compos- ite perforation, set up is the finite element model of composite perforation, based on which the dominance dynamic numerical calculation about the model is done by LS_DYNA software. Then the uneven distribution of pressure and temperature in the perforators is obtained after the shaped charge explosion. The longer the time span, the further the distance from initiation point, the lower the pressure caused by blast wave and rarefaction wave. The experiments are made about impact sensitivity and hot fire of the gunpowder between adjacent charges. Determined is the ig- nition mode of gunpowder inside the gun body based on the experiments and numerical analysis. The experiments show that, hot fire temperature of the gunpowder between adjacent charges is 300~350 ~C; impact sensitivity is 2.07~2.65 GPa,time delay is 4/~s. The gunpowder combus- tion performance and p--t curve in the gun body are studied under coupling action of gunpowder combustion and powder explosion. The gunpowder combustion speed increases along with the pressure and temperature rise. Comparison with experiment p--t curve indicates that the numerical simulation method on explosion and combustion mechanism of the composite perforation has high accuracy.
出处
《测井技术》
CAS
CSCD
北大核心
2012年第1期78-83,共6页
Well Logging Technology
关键词
复合射孔
LS_DYNA软件
燃烧速度
耦合作用
爆炸
燃烧
composite perforation, LS_DYNA software, combustion velocity, coupling action, explosion, combustion
