点火结构影响压力波的实验研究和数值模拟

INFLUENCE OF IGNITION SYSTEM ON PRESSURE WAVES WITHIN BORES—EXPERIMENTAL STUDY AND NUMERICAL SIMULATION

介绍一种带烟火剂双层中心点火管的新型点火系统。根据这种点火系统的特殊结构,建立了点火管和装药床的双一维两相流内弹道模型和烟火传火管喷火孔燃气喷射流量模型。数值计算与试验结果比较表明,理论与实验之间具有良好的一致性。实验与计算结果都证明该中心点火管对抑制膛内压力波是有效的。

A new ignition system where a two layered centre core ignition system having a pyrotechnic composition is given. Based on the characteristics of the new ignition system, two sets of quasi-single-dimensional two-phase flow interior ballistic models are set up that are applicable to the propellant bed and the centre core ignition system respoctively, as well as a model for the volumetric rate of burning gas ejected from nozzles of the pyrotechnic composition, comparisons between theory and experiments show that the theory accords well with the results of experiment. Both experimental results and theory point to the fact that the new ignition system is effective in suppressing the pressure wave.