Plume detachment from a magnetic nozzle
Plume detachment from a magnetic nozzle
复制标题
羽流从磁性喷嘴中分离
DOI：
10.1063/1.3080206
复制
发表时间：
2009
影响因子：
2.2
通讯作者：
Branwen Schuettpelz
中科院分区：
文献类型：
--
作者：
Christopher A. Deline;R. Bengtson;B. Breizman;Mikhail R. Tushentsov;Jonathan E. Jones;D. Greg Chavers;Chris C. Dobson;Branwen Schuettpelz
利用磁化等离子体的大功率电力推进推进器需要等离子体排气与外加磁场分离以产生推力。本文给出了实验结果，证明了足够能量和流动的等离子体确实可以从磁性喷嘴中分离出来。微波干涉仪和探针测量提供羽流密度，电子温度，和离子通量测量在喷嘴区域。对离子通量的测量表明，在等离子体运动压力达到磁压力之前，一个低β的等离子体羽流会沿着施加的磁场线运动，随后一个高β的羽流会以弹道方式膨胀。测试了几种磁结构，包括反磁场喷嘴结构。尽管磁场剖面发生了巨大的变化，但相反的磁场结构在羽流轨迹上几乎没有产生可测量的变化，表明羽流是分离的。数值模拟得到的密度分布与实验结果基本一致。
High-powered electric propulsion thrusters utilizing a magnetized plasma require that plasma exhaust detach from the applied magnetic field in order to produce thrust. This paper presents experimental results demonstrating that a sufficiently energetic and flowing plasma can indeed detach from a magnetic nozzle. Microwave interferometer and probe measurements provide plume density, electron temperature, and ion flux measurements in the nozzle region. Measurements of ion flux show a low-beta plasma plume which follows applied magnetic field lines until the plasma kinetic pressure reaches the magnetic pressure and a high-beta plume expanding ballistically afterward. Several magnetic configurations were tested including a reversed field nozzle configuration. Despite the dramatic change in magnetic field profile, the reversed field configuration yielded little measurable change in plume trajectory, demonstrating the plume is detached. Numerical simulations yield density profiles in agreement with the experimental results.