Dynamic Behaviors Of Small-sized Space Debris Irradiated By Space-based Pulse Laser

Small-sized space debris on the order of 1-10cm in diameter can cause huge damage to orbiting satellites and spacecraft under high-speed motion.In order to maximize the safety of the low earth orbit space environment,the technology of high-energy pulse laser actively removing centimeter-scale space debris has become the focus for domestic and foreign scholars in recent years.In this thesis,the dynamic behaviors of centimetar-scale space debris irradiated by space-based pulse laser are studied and simulation analysis and experimental test results have proved the validity and reliability of the proposed method and simulation model.The results can provide important theoretical reference and guidance for the applicable research of pulse laser to actively removing centimeter-scale space debris.The following conclusions are drawn:In this thesis,the interaction laws of different laser pulse widths,laser wavelengths,and laser powers on the impulse coupling effect were givecn.A fluid-solid-thermal-plasma multi-physical field coupling model of the debris irradiated by pulse laser was established.The effects of different laser irradiation times and incident laser powers on plasma plume generated by the debris were also obtained,The change rules of active deorbit of the debris by multi-pulse laser irradiation were mastered based on coplanar conditions.Finally,a virtual scene demonstration platform for active deorbit of the debris irradiated by pulse laser was built,and the whole process of the debris removal was intuitively described by three-dimensional simulation.The results indicated that the change of impulse coupling coefficient was about 0.04543 when the pulse laser power changes by 2 times.Under the same irradiation time of pulse laser,the jet velocity of the plasma plume on the debris surface was increased with the increase of pulse laser power.Espec.ially,the maximum jet velocity of the anti-jet plume on the debris surface can reach 350m/s when the action time was 40μs and the laser power was 500kW.With the increase of the number of laser pulses and the laser powers,the orbital semi-major axis and orbital eccentricity of the debris were continued to increase,while the height of the perigee orbit was continued to decrease.As a result,when the pulse laser power reached 500kW and the number of laser pulses was 965,the perigee orbital altitude of the debris was decreased to 199.8km after four times of irradiation.That is,the active deorbit of the debris was realized when the debris reached a graveyard orbit of less than 200km.