【作者】 肖遥； 李运良； 刘赟哲； 陈立强； 谭书舜； 朱玉荣； 赵奇峰；

【Author】 Xiao Yao;LI Yunliang;Liu Yunzhe;Chen Liqiang;Tan Shushun;Zhu Yurong;Zhao Qifeng;Northwest Institute ofNuclear Technology;

【机构】 西北核技术研究所；

【摘要】 为研究首级火药驱动大口径155/65二级轻气炮弹带预控活塞启动压力技术,使用LS-DYNA软件,依据25～30MPa活塞启动压力需求,对活塞尾部弹带进行了优化设计,优选了3种弹带高度工况,并仿真得到活塞弹带结构的挤进过程。实验平台为一门膛室容积25升,发射管长1.8m,口径155mm短管炮,在膛室底部、坡膛处安装了压力传感器,实测了活塞启动压力时程曲线,采用超高速摄影技术,获得了活塞的出炮口速度、姿态,以及弹带变形损坏情况。通过对比实验与计算结果,活塞出炮口弹速误差小于4%,实测了回收弹带变形情况,与数值模拟结果基本一致,通过调节弹带高度,能够有效提升活塞启动压力,但高度达到临界值时,当弹带前端挤进后发生严重变形,进而导致弹带后端螺纹结构完全失效。通过本轮次实验,掌握了分别适用于15～25MPa的活塞弹带结构,为后续二级轻气炮弹速调试实验提供了必要技术基础。更多还原

【Abstract】 In order to study the technology of pre-controlled piston starting pressure for the first-stage powder projection driving large-caliber 155/65 two-stage light gas gun. LS-DYNA software was used to optimize the design of rear belt of piston according to the starting pressure requirement of the 25 ～ 30MPa, giving priority to three kinds of belt height condition, and get the engraving process of piston belt structure by simulation. The experimental platform is a short tube gun with a chamber volume of 25 liters, a length of 1.8 meters and a diameter of 155 millimeters,installed pressure sensor at the bottom of the chamber and on the slope of the chamber, measured the piston start-up pressure time-history curve. Using the ultra-high speed camera technology, the velocity and attitude of the piston leaving the muzzle, as well as the deformation and damage of the belt are obtained.By comparing the experiment with the simulation results, the velocity error of the piston in muzzle is less than 4%, and the deformation of the recovered belt was measured, which is basically consistent with the numerical simulation results. By adjusting the height of the belt, the starting pressure of the piston can be effectively raised, but when the height reaches the critical value,serious deformation will occur after the front of the belt is pushed into the rear, resulting in the complete failure of the rear end thread structure of the belt. Through this experiment, the structure of piston belt suitable for 15 ～ 25 MPa is mastered, which provides the necessary technical basis for the subsequent test of two-stage light gas projectile.更多还原