优化的一维激光清理空间碎片流体力学模型

Optimized one-dimensional fluid mechanics model for laser cleaning up space debris

优化了一维纳秒脉冲激光等离子体化空间碎片的流体力学模型。流体力学模型分为等离子体状态方程求解、空间碎片与激光能量耦合计算、激光推进冲量耦合系数计算三个模块。在各模块实现的基础上,重点分析了碎片等离子体温度、速度、压强、密度的时间和空间分布规律。考虑到等离子体屏蔽效应对激光效能的影响,提出等离子体对激光逐层吸收的计算方法,更准确分析激光功率密度和脉宽对激光清理空间碎片效能的影响,提出了获取最优激光效能的方法。最后与实验经验公式解相比较,验证了优化模型的正确性。

The optimizedfluid mechanics model was fabricated to solve the plasma of space debris excited by nanosecond pulse laser. Fluid mechanics model was divided into solution of plasma state equation,energy coupling between laser and space debrisand momentum coupling coefficient. In each module implements, time and space distribution of temperature, velocity, pressure and density of debris plasma were analyzed. Considering the influence of plasma shielding effect to the laser efficiency, innovation was putt forward to achieve the highest efficiency of laser to clean up space debris by the method of absorption mechanism of layer by layer. Influences of pluse width and power density to the momentum coupling coefficient were acheived. Finally, comparing the result to experimental experience data prove the verification of the simulation.