激光支持的脉冲等离子体推力器工质烧蚀与加速机理研究

项目名称： 激光支持的脉冲等离子体推力器工质烧蚀与加速机理研究

项目编号： No.11202235

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 何振

作者单位： 中国人民解放军国防科学技术大学

项目金额： 28万元

中文摘要： 将激光应用于脉冲等离子体推力器（Pulsed Plasma Thrust，PPT）为改善和提高PPT的性能提供了新途径。本项目以激光支持的PPT为研究对象，针对工质的激光烧蚀、电离增强和加速过程，综合运用实验研究、理论分析和数值模拟方法进行系统研究。实验研究纯激光烧蚀产生的等离子体羽流特性，分析羽流中离子、中性气体等的速度和质量分布规律，探索激光烧蚀质量和电离率的影响因素；分析多种工质的激光烧蚀特性，为工质选型与改性提供指导。测试并对比分析进入放电通道后的等离子体特性变化，总结羽流粒子沉积规律，探索电离增强机理及其影响因素。通过推力和冲量测量及等离子特性实验，弄清等离子体加速机制。在放电通道内叠加多种磁场，探索磁场位形对等离子体运动的影响规律。建立磁流体力学模型并进行数值仿真研究，探究等离子体电离增强与加速过程的内在物理机制，寻找提高工质利用率、提升推力器性能的有效方法。

中文关键词： 激光支持的脉冲等离子体推力器；工质烧蚀；光谱诊断；电磁加速；

英文摘要： The combination of laser with pulsed plasma thruster (PPT) will provide a new way to improve the performance of PPT. The process of laser ablation, plasma ionization enhancement and plasma acceleration in laser assisted PPT will be investigated by means of experimental, theoretical and numerical methods. Experimental study on characteristics of laser plasma plume and analysis of plume including ions and neutral gaseous matter will be conducted to explore the way of improving ablatant ionization rate. The factors that affecting the laser ablation will be investigated and the principal for choosing the propellant will be preposed. The characteristics of plasma in the discharge channel and deposition of plume particles will be analyzed and compared with laser plasma plume to reveal the mechanism of ionization enhancement. According to the measurements of thrust and impulse bit and the observation on characteristics of plasma, the mechanism of plasma acceleration will be studied. The effect of magnetic fields added to the plasma will be investigated. A MHD model which describing the physical process of plasma ionization enhancement and acceleration will be developed. Numerical simulation will be implemented to explore the ionization and acceleration mechanism in discharge channel and illustrate the effective ways to

英文关键词： Laser-sustained pulsed plasma thruster；Propellants ablation；Spectrum diagnosis；Electromagnetic acceleration；