激光脉宽和气压环境对固体火箭推进剂点火反应程度的影响研究

Experimental Research of Solid Propellant Laser-Ignition under Different Pulse-Width and Air Pressure

在真空（10 Pa）和空气（10^5 Pa）环境下,分别用短脉宽（10 ns）和长脉宽（140μs）激光辐照固体火箭推进剂HTPB/AP/Al样品,利用电磁复摆测量了冲量值,获取了对应激光入射能量和样品质量迁移量。结果表明：在长脉宽激光作用时,比冲在真空中随功率密度提高而增长,在空气中受激光烧蚀带走部分能量的影响偏低;用短脉宽激光作用时,热化学反应作功贡献减少,比冲在真空中受等离子体屏蔽影响较低,空气中冲量耦合机制以LSD波作功为主。

The sample of solid propellant HTPB/AP/A1 had been irradiated by Short-pulse laser（10ns）and long-pulse laser（140μs） in vacuum（10 Pa） and air（10^5 Pa） condition.Impulse datas had been measured using electromagnetic compound pendulum while laser energy and mass decrement had also been collected.Impulse rises with increase of incident power density in vacuum when using long-pulse laser,but the value is smaller in the air for a large sum of energy taken away by ablation.However,the contribution of thermochemistry reaction is declining when using short-pulse laser for the shielding influence of plasma.And LSD wave dominate the source of momentum in the air condition.