摘要
放电室磁场的优化设计是离子推力器结构改进设计的关键技术之一,直接影响到推进剂电离效率和整机工作稳定性。针对深空探测等空间轨道任务对20 cm氙离子推力器应用需求,利用电磁体磁感应强度实时可调的优势,获得了给定工作模式下20 cm氙离子推力器放电室磁场最优构型及其磁感应强度的最佳分布。在此基础上,运用等效磁通理论,明确了产生相同磁场构型及其磁感应强度分布的永磁体结构尺寸。将20 cm氙离子推力器放电室磁场优化前后的性能进行对比,结果表明:在不改变整机结构的情况下,放电室磁场优化后推力可提升50%,由40 m N提高到60 m N,比冲提高到3 500 s,效率提高到65%。通过磁场优化,使得20 cm氙离子推力器具备了在40 m N和60 m N双模式工作的能力。研究为高效、稳定工作的离子推力器磁场优化提供方法。
The optimization design of magnetic field is one of the most important techniques in ion thruster improved design,it directly influence the ionization efficiency of the propellant and in-orbit life.Aiming at the application requirement of deep space exploration for 20 cm xenon ion thruster,using adjustable real-time of the magnetic induction intensity in electromagnet,the magnetic field configuration and its induction intensity distribution of the20 cm xenon ion thruster are obtained.Based on it,combined with the equivalent magnetic circuit method,the structure parameters of the permanent magnet which can produce requested magnetic induction intensity are obtained.And the fore-and-back performances of 20 cm xenon ion thruster magnetic field are compared.Results showed that the thrust of 20 cm xenon ion thruster increased from 40 m N to 60 m N,which is improved by 50%,the specific impulse increases to 3 500 s and the efficiency is improved to 65% without changing the mechanical structure of the thruster.By magnetic field optimizing,the 20 cm xenon ion thruster is achievable for 40 m N and 60 m N operating modes.Above research will certainly provide method for the design and optimization of the ion thruster.
出处
《科学技术与工程》
北大核心
2017年第22期143-147,共5页
Science Technology and Engineering
基金
国家自然科学基金(61601210)资助
关键词
20
cm氙离子推力器
磁场优化
永磁体
双工作模式
20 cm xenon ion thruster
magnetic field optimization
permanent magnet
double working mode
