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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。
Solid rocket propellant HTPB / AP / Al samples were irradiated by short pulse width (10 ns) and long pulse width (140 μs) under vacuum (10 Pa) and air (10 ~ 5 Pa) The pendulum measures the impulse value and obtains the corresponding laser incident energy and sample mass shift. The results show that the specific impulse increases with the increase of the power density in vacuum when the laser pulse has a long pulse width and is less affected by the energy of laser ablation in the air. With the short pulse width laser, the thermochemical reaction The contribution of work is reduced, and specific impulse is less affected by plasma shielding in vacuum. The coupling mechanism of impulse in the air mainly uses LSD wave for work.