激光等离子体烧蚀推力的机理研究

随着航天空航空天技术的发展,激光等离子体推进受到了人们的普遍关注.基于激光与物质相互作用产生等离子体的空间分布,本文从微观、宏观和简化模型推导了碳靶的烧蚀压与激光强度的幂函数关系,幂指数分别是0.60493、2/3和2/3.实验测得碳靶的最大偏移量与激光能量的幂函数关系,幂指数为0.61936.实验与微观模型的幂指数相...

Mechanism investigation on thrusting forcefrom ablation plasma by laser

With the development of aerospace and airspace technology,laser plasma propulsion has attracted more and more attention.Based on spatial distribution of the plasma from laser interacting with substance,in this paper,the power function relationship between ablation pressure of carbon target and laser intensity is deduced from microscopic,macroscopic and simplified models,the power indices are 0.60493,2/3 and 2/3,respectively.The experiment shows the power function relationship between the maximum deviation of carbon target and the laser energy,and the power index is 0.61936.The relative difference of power index between the experiment and the microscopic model is only about 2.32%,while the value between the experiment and the macroscopic or simplified model attains about 7.64%,this indicates the rationality of the microscopic model.However,either the macroscopic or the simplified model is also applicable to some extent that the error permits.The mechanism analysis of laser plasma ablation thrust has some guiding significance for engineering research.