镁合金可燃内衬对底排药柱动态形变及燃烧稳定性的影响研究

为了解决复合底排药剂在发射过程中出现的药柱破碎、燃烧失稳等问题，提出了在底排药柱内腔直接加装一种具有短暂性结构保护和辅助燃烧作用的镁合金可燃内衬的防护、助燃措施。利用ABAQUS软件建立了底排药柱在极端工况条件下有、无可燃内衬时的发射过程有限元仿真分析模型，并进行了动态射击对比验证试验。仿真分析表明：可燃内衬能够有效防止底排药柱过度变形。动态射击对比验证试验结果表明：加装可燃内衬后，弹丸平均初速提高4.97 m/s；同时，底排药柱点火燃烧的一致性和稳定性均有所提高。

Research on the Influence of Magnesium Combustible Liner on Dynamic Deformation and Combustion Stability of Composite Base Bleed Propellant Grain

To solve the problems of that composite base bleed propellant grain (CBBPG) is crushed and unstably combusts during launching, a protection strategy is proposed by directly installing a magnesium combustible liner (MCL) with temporary strength protection and auxiliary combustion in the inner hole of CBBPG. The FEM analysis model of CBBPG’s launching process in extreme working conditions is established by using ABAQUS, and the dynamic shooting contrast verification test is done. The simulation results show that MCL can effectively prevent CBBPG from excessively deforming during launching. At the same time, the test results show that the average velocity of the projectiles with MCL is increased by 4.97 m/s, and the combustion consistency and combustion stability of CBBPG are both improved.