射流冲击固体发动机起爆阈值的数值模拟  

Numerical simulation of initiation threshold of solid engine by shaped-charge jet

作　　者：石浩男 戴开达[1] 张媛[2] 向召 赵猛 李苗苗 陈静静 SHI Haonan;DAI Kaida;ZHANG Yuan;XIANG Zhao;ZHAO Meng;LI Miaomiao;CHEN Jingjing(State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China;Beijing No.13 High School, Beijing 100120, China;Shanghai Space Propulsion Technology Research Institute, Huzhou 313000, China)

机构地区：[1]北京理工大学爆炸科学与技术国家重点实验室,北京100081 [2]北京市第十三中学 [3]上海航天动力技术研究所,湖州3130002

出　　处：《兵器装备工程学报》2022年第6期24-28,78,共6页Journal of Ordnance Equipment Engineering

基　　金：装备预研领域基金项目(61407200204)。

摘　　要：通过射流对固体火箭发动机的冲击起爆的数值模拟,根据Held起爆判据,确定了固体发动机的起爆阈值。数值仿真结果表明,81 mm标准射流弹能够形成头部速度达到6100 m/s的聚能射流,当该聚能射流直接冲击发动机后,推进剂受到射流侵彻发生剧烈反应,球形冲击波向另一侧推进剂径向传播,导致推进剂发生二次反应,推进剂内部观察点的压力峰值达到40 GPa以上,反应度为1,表明推进剂发生了完全爆轰;通过调节靶板的厚度获得不同的射流能量,计算发动机的临界起爆阈值v^(2)d约为126.03 mm^(3)·μs^(-2)。Based on Held’s criterion,the initiation threshold of solid engine was obtained by the numerical simulation on impacting initiation of jet to solid-rocket engine.The numerical simulation results show that the81 mm standard jet projectile could form a jet with a head speed of 6100 m/s.When the engine was directly impacted by the jet,the propellant had a violent reaction.The spherical shock wave propagated along the radial direction to the other side of the propellant,resulting in the secondary reaction of the propellant.The peak of pressure at the internal observation point of the propellant reached over 40 GPa and the reactivity(ALPHA)reached 1,indicating that the propellant underwent detonation.By adjusting the thickness of the target plate to obtain different jet energy(v2d),the critical detonation threshold v^(2)d of the engine was calculated to be about 126.03 mm^(3)·μs^(-2).

关 键 词：固体火箭发动机 聚能射流 冲击起爆 起爆阈值 

分 类 号：V435[航空宇航科学与技术—航空宇航推进理论与工程]