摘要
微纳卫星的飞速发展对微推力器的性能提出了更高的的要求。激光推进微推力器因其比冲高、推力控制精确、能耗低等特点,为微纳卫星提供了一种性能优异的微推力器选择方案。文中在透射式烧蚀模式下,研究了半导体激光器的激光功率密度和脉宽对激光烧蚀性能的影响。结果表明,在工质厚度为200μm的工况下,随着激光功率密度的增加,单脉冲冲量和比冲都逐渐增大,而冲量耦合系数和烧蚀效率都存在一个最优值。随着激光脉宽的增加,单脉冲冲量逐渐增加,比冲呈现出先增大后减小的趋势,在250μs时,比冲达到最大值,约为221.8 s;冲量耦合系数和烧蚀效率都随着脉宽的增大而减小;脉宽超过一定的临界值时,会对激光烧蚀工质的靶坑产生不良影响,使得激光能量和工质严重浪费。激光参数的优化对于激光推进微推力器的工程化应用提供了参考。
With the rapid development of micro-nano satellites, the performance of micro-thrusters is required to be higher. Because of its high specific impulse, precise thrust control and low energy consumption, the laserpropelled micro-thruster provides an excellent micro-thruster choice scheme for micro-nano satellite. In this paper, the influence of power density and pulse width of semiconductor laser on the performance of laser propulsion was studied in transmission ablation mode. The results show that when the thickness of the working medium layer is 200 μm, with the increase of the laser power density, the single pulse impulse and specific impulse gradually increase. And there is an optimal power density value to the impulse coupling coefficient and ablation efficiency. As the pulse width of the laser increases, the impulse of the single pulse gradually increases,and the specific impulse first increases and then decreases. At 250 μs, the specific impulse reaches its maximum value, which is about 221.8 s. The impulse coupling coefficient and ablation efficiency decrease with the increase of pulse width. When the pulse width exceeds a certain critical value, it will have a bad effect on the target pit of the laser ablation working medium, resulting in a serious waste of laser energy and working medium. The optimizing of laser parameters provides a reference for the engineering application of laser propelled microthruster.
作者
王思博
蒋陆昀
洪延姬
杜邦登
邢宝玉
张腾飞
高贺岩
Wang Sibo;Jiang Luyun;Hong Yanji;Du Bangdeng;Xing Baoyu;Zhang Tengfei;Gao Heyan(State Key Laboratory of Laser Propulsion&Application,Space Engineering University,Beijing 101416,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2022年第6期213-219,共7页
Infrared and Laser Engineering
关键词
激光推进
比冲
冲量耦合系数
功率密度
脉宽
laser propulsion
specific impulse
impulse coupling coefficient
power density
pulse width
