基于GAP含能靶带的激光烧蚀微推进技术研究

发布时间：2018-10-10 10:32

【摘要】：微推力器是微纳卫星姿态控制、轨道保持和机动的重要元件。微纳卫星的快速发展,对微推进系统提出了很高的要求。针对激光烧蚀微推力器,本文的主要工作如下：(1)为了精确测量激光烧蚀微推力器产生的冲量,基于扭摆测试冲量的原理,建立了微冲量测试平台,分析了阻尼对测试结果的影响。研究结果表明推力测试平台的分辨率为4.1×10-7N.s,可以实现4.1×10-7N.s-4.45×10-3N.s范围内的冲量测试。空气和外接线路引入的阻尼为10-3量级,引起的测量误差小于1%。(2)设计了基于透射模式的激光烧蚀微推力测试样机。该样机使用功率较小的半导体激光器为光源,使用具有聚焦功能的光纤耦合输出激光,作用于烧蚀材料的有效功率密度为1.27×104W/cm2。对以含能聚合物叠氮缩水甘油醚(GAP)作为烧蚀材料制作的靶带进行了静态标定,实验得到烧蚀层厚度为170μmm的靶带的最高比冲为104s,最高冲量耦合系数为2471μN/W。(3)获得了锥形喷口和直壁型两种喷口对冲量的影响规律。研究结果表明使用锥形喷口会使得冲量急剧减小。直壁型喷口由于可以有效地约束气体产物,因此可以有效地增大比冲。内径1mm、长度6mm的直壁型喷口使得冲量最多增大了25.0%。由于溅射产物颗粒较大,纳米铝粉的加入会明显减小比冲,最多减小了47.4%。
[Abstract]:Micro-thruster is an important component in attitude control, orbit keeping and maneuver of micro-nano satellite. With the rapid development of micro-and nano-satellites, the requirement of micro-propulsion system is very high. The main work of this paper is as follows: (1) in order to accurately measure the impulse produced by laser ablation micro-thruster, based on the principle of torsion pendulum testing impulse, a micro-impulse measurement platform is established. The influence of damping on the test results is analyzed. The results show that the resolution of the thrust test platform is 4.1 脳 10 ~ (-7) N.s, and the impulse measurement can be realized in the range of 4.1 脳 10-7N.s-4.45 脳 10-3N.s. The damping introduced by air and external circuits is of order of 10 ~ (-3), and the measurement error is less than 1. (2) A laser ablation micro-thrust test prototype based on transmission mode is designed. The semiconductor laser with low power is used as the light source and the fiber coupling output laser with focusing function is used. The effective power density of the ablative material is 1.27 脳 10 ~ 4 W / cm ~ (2). The effective power density of the laser is 1.27 脳 10 ~ (4) W / cm ~ (2). The static calibration of targets made of energetic polymer glycidyl azide (GAP) as ablative material was carried out. The experimental results show that the maximum specific impulse and the maximum impulse coupling coefficient of the target band with the thickness of 170 渭 mm are 104 s and 2471 渭 N / W (3) respectively. The results show that the use of a conical nozzle can dramatically reduce the impulse. The straight wall nozzle can effectively increase the specific impulse because it can restrain the gas product effectively. A straight wall nozzle with an inner diameter of 1 mm and a length of 6mm increases the impulse by up to 25.0. Due to the large size of the sputtering product, the specific impulse of the nano-aluminum powder is obviously reduced, and the maximum reduction is 47.4%.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN249

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