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激光推力器性能优化是激光推力器研究的重要组成部分。受硬件条件的限制,激光推进领域激光脉冲时间波形对推力器性能影响的研究并未广泛展开。以两台CO2激光器的实际脉冲波形为基准,建立了两组激光能量输入模型,其波形时间分布相似,单脉冲能量相同,但脉冲持续时间及峰值功率不同。数值计算比较了不同脉冲波形下抛物型激光推力器的性能,结果表明:峰值功率和脉冲持续时间是影响推力器性能的重要参数,高功率短持续时间的脉冲波形更有利于提高冲量耦合系数和推力;两种实际脉冲波形的冲量耦合系数数值计算结果分别为40.9×10-5N.s/J,30.0×10-5N.s/J,与文献报道实验测量结果基本吻合。为激光推进CO2激光器的脉冲波形设计提供支持及研究思路,具有一定参考价值。
Laser thruster performance optimization is an important part of laser thruster research. Due to the limitations of hardware conditions, the research on the influence of laser pulse time waveform on the performance of thrusters in the field of laser propulsion has not been widely carried out. Based on the actual pulse waveforms of two CO2 lasers, two sets of laser energy input models are established. The time distribution of the waveforms is similar, and the single pulse energy is the same, but the pulse duration and the peak power are different. The numerical calculation compares the performance of parabolic laser thrusters under different pulse waveforms. The results show that the peak power and pulse duration are important parameters that affect the performance of thrusters. The pulse waveform with high power and short duration is more conducive to improving the impulse coupling coefficient and Thrust force. The numerical calculation results of the impulse coupling coefficients of the two kinds of actual pulse waveforms are respectively 40.9 × 10-5N.s / J and 30.0 × 10-5N.s / J, which are in good agreement with the experimental measurements reported in the literature. It provides a certain reference value for the design of pulse waveform of laser-driven CO2 laser.