碳纳米管阵列推力器放电特性的数值模拟研究  

Numerical Simulation of Discharge Characteristics of CNT Array Thruster

作　　者：鹿畅 夏广庆[1,2,3] 孙斌 韩亚杰 关思琦 LU Chang;XIA Guang-qing;SUN Bin;HAN Ya-jie;GUAN Si-qi(School of Aeronautics and Astronautics,Dalian University of Technology,Dalian 116024,China;State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian 116024,China;Key Laboratory of Advanced Technology for Aerospace Vehicles of Liaoning Province,Dalian 116024,China;DUT-BSU Joint Institute,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学航空航天学院,大连116024 [2]工业装备结构分析国家重点实验室,大连116024 [3]辽宁省空天飞行器前沿技术重点实验室,大连116024 [4]大连理工大学白俄罗斯国立大学联合学院,大连116024

出　　处：《宇航学报》2021年第5期634-641,共8页Journal of Astronautics

基　　金：国家重点研发计划(2020YFC2201100);国家自然科学基金(11675040);中央高校基本科研业务费专项资金(DUT21GJ206,DUT20LAB203);辽宁省重点研发计划(2020JH2/10500003)。

摘　　要：基于直接蒙特卡洛(DSMC)算法、浸入式有限元算法(IFE)、粒子云及蒙特卡洛碰撞(PIC-MCC)算法以及Ammosov-Delone-Krainov(ADK)隧穿电离模型建立了碳纳米管阵列推力器工质气体和CNT场电离过程的三维仿真模型。利用文献中的实验数据对本文仿真模型的有效性进行了验证,结果表明本文仿真模型与实验结果基本一致。针对碳纳米管阵列推力器的放电特性进行了研究,并重点分析了离子与原子碰撞过程对碳纳米管阵列推力器放电特性的影响。结果表明CNT可以极大地增强局部电场,稳态时场增强因子约为1308;与原子的碰撞使得离子在CNT附近更加集中,降低了局部电场,进而降低了其场增强能力。Based on the Direct Simulation Monte Carlo(DSMC)method,Immersed Finite Element(IFE)method,Particle-in-cell Monte Carlo Collision(PIC-MCC)method and Ammosov-Delone-Krainov(ADK)tunneling ionization model,a three-dimensional simulation model for the carbon nanotube(CNT)array thruster is established.The validity of the simulation model is verified by comparison with experimental data in literature.The results show that the simulation model is in agreement with the experimental results.Then the discharge characteristics of the carbon nanotube array thruster are studied,and the influence of collisions is also analyzed.The results show that CNT can greatly enhance the local electric field,and the field enhancement factor in steady state is about 1308;the collision with atoms makes ions more concentrated near the CNT tip,thus reducing the local electric field and its field enhancement ability.

关 键 词：电推进 微推进 碳纳米管阵列推力器 放电特性 数值模拟 

分 类 号：V439.4[航空宇航科学与技术—航空宇航推进理论与工程]