【摘要】 喷管是激光推力器的重要组成部分。在设计喷管构形时,可以使其与聚光系统一体化设计,也可以把聚光系统和喷管分离设计。针对聚光系统与喷管分离设计的工作模式,建立了一种辅助聚焦系统的点火模型。通过改变喷管的构形,分析了圆锥形、圆台形喷管的冲量耦合系数与喷管顶部直径与出口直径之比以及喷管长度与出口直径之比之间的关系。通过对推力曲线的分析,阐述了喷管结构参数对其性能影响的原因。研究结果显示,圆台形喷管的推进性能优于圆锥形和圆筒形。更多还原

【Abstract】 The nozzle is one of the most important parts of a laser thruster.It can be designed with the focusing system together.It can also be designed independently without considering the focusing system.For the latter case,an ignition mode was set up with an auxiliary focusing system.By changing the parameters of the nozzle,the relationship between the impulse coupling coefficient and two dimensionless parameters,the ratio of the head diameter to the exit diameter of the nozzle and the ratio of the nozzle length to the exit diameter of the nozzle,was obtained.The reasons why the parameters of nozzle structure affect the impulse coupling coefficient were explained.The results show that the propulsion performance of the rotary trapezium nozzle is better than that of the column nozzle or the conical nozzle.The highest impulse coupling coefficient was gained when the two ratios were about 0.189 and 1 separately under the calculation condition of this paper.更多还原