霍尔推力器中电子传导的新机制：无碰撞近壁传导研究

Hall thrusters are the future propulsion devices used on space platforms of our country. Near wall conduction is a special and important form of electron transport in Hall thrusters, which has a decisive influence on thruster's discharge features and performance..The traditional near wall conduction theory based on electron-wall collision presents a great difference from the actual situation. Applicant of this project has discoveried a new kind of electron transport - - collisionless near wall conduction and found its simulation outcomings according well with the experiemental results. Based on this, an in-depth study of mechanism of the collisionless near wall conduction is conducted in this project, the establishment of parametric model of this collision-free conductivity is pursued, the improvement of near wall conduction theory is processed, and finally its influnce on the discharge features of the thruster is investigated..This project carries out a systematic study on the collisionless near wall conduction using both the experimental measurement and the numerical simulation. The findings of this research not only help greately to understand the operation mechanism of Hall thrusters, but also provide references to those plasma discharge devices which possess the same orthogonal electromagnetic field.

霍尔推力器是我国未来空间平台推进装置的发展趋势。近壁传导是霍尔推力器中一种特殊的重要电子传导形式，对推力器的放电特性及性能具有决定性的影响。.传统意义上的以电子与壁面碰撞为基础的近壁传导理论与实际情况之间存在巨大差距。申请人研究发现了一种新的电子传导机制- - 无碰撞近壁传导，并发现了其模拟效应与实验吻合。基于此，本项目对无碰撞近壁传导的产生机理进行深入研究，建立无碰撞近壁电导率的参数化模型，完善近壁传导理论，进而研究无碰撞近壁传导对推力器放电特性的影响。.本项目以实验测量结合数值模拟的手段对霍尔推力器中的无碰撞近壁传导机制开展系统性的研究。研究结果不仅对理解霍尔推力器的工作机制具有重要意义，而且对在正交电磁场下放电的其他等离子体装置具有普遍的参考价值。

本项目按照既定研究计划开展了相关工作，掌握了引起无碰撞近壁传导的成因及其物理特性，获得了无碰撞近壁传导自身的特性，明确了无碰撞近壁传导对电子横越磁场形成的电导率的贡献，搞清楚了电子传导的调制对霍尔推力器放电物理过程及性能的影响，解决了电推力器中存在的一类共性电子横越磁场传导问题，基本完成了拟定的研究目标。截止目前，共计发表SCI检索论文16篇，培养硕博士生至少5名。