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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200 μm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250 μs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。 相似文献
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为解决激光烧蚀推力器在微纳卫星推进中的应用问题,本文旨在研究半导体激光对柔性基底含能工质带的烧蚀特性。针对不同工质层厚度的工质带,通过调节优化半导体激光器电流和脉宽等参数开展了激光烧蚀实验,研究了柔性基底含能工质的单脉冲冲量、比冲、冲量耦合系数和烧蚀效率等烧蚀冲量耦合特性,分析了激光器参数和工质层厚度对烧蚀冲量耦合特性的影响,得到了实现更高比冲的烧蚀工作条件。实验结果表明,在相同的激光器电流条件下,冲量随激光器脉宽的增大而增大,比冲随脉宽的增大而减小。在相同的激光器工作条件下,随着工质层厚度增大,工质带烧蚀的比冲增大,340μm厚工质带获得最大比冲在350 s以上,冲量耦合系数达到220μN/W以上。 相似文献
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Sibo WANG 《等离子体科学和技术》2022,24(10):105504
In order to optimize the laser ablation performance of a micro-thruster with 1U dimensions, which employs a micro semiconductor laser, the impacts of pulse width and glycidyl azide polymer (GAP) thickness on thrust performance were researched. The results showed that with a GAP thickness of 200 μm, the single-pulse impulse (I) increased gradually with the increase in the laser pulse width from 50 to 800 μs, while the specific impulse (Isp), impulse coupling coefficient (Cm) and ablation efficiency (η) all reached optimal values with a 200 μs pulse width. It is worth noting that the optimal pulse width is identical to the ignition delay time. Both Cm and η peaked with a pulse width of 200 μs, reaching 242.22 μN W−1 and 35.4%, respectively. With the increase in GAP thickness, I and Cm increased gradually. GAP of different thicknesses corresponded to different optimal laser pulse widths. Under a certain laser pulse width, the optimal GAP thickness should be the most vertical thickness of the ablation pit, and the various propulsion performance parameters at this time were also optimal. With the current laser parameters, the optimal GAP thickness was approximately 150 μm, Isp was approximately 322.22 s, and η was approximately 34.94%. 相似文献
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