• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Investigation of the plasma acceleration mechanism within a coaxial hall thruster.
【24h】

Investigation of the plasma acceleration mechanism within a coaxial hall thruster.

机译：对同轴霍尔推进器内的等离子体加速机制的研究。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This is the study of emissive probe based plasma potential measurements and laser-induced fluorescence velocimetry of neutral and singly-ionized xenon in the plume and interior portions of the acceleration channel of a Hall thruster plasma discharge operating at powers ranging from 250 to 725 W. Axial ion and neutral velocity profiles for four discharge voltage conditions (100 V, 160 V, 200 V, 250 V) are measured as are radial ion velocity profiles in the near-field plume. Axial Ion velocity measurements both inside and outside the thruster as well as radial velocity measurements outside the thruster are performed using laser induced fluorescence with nonresonant signal detection. Neutral axial velocity measurements are similarly performed in the interior of the Hall thruster with resonance fluorescence collection. Optical access to the interior of the Hall thruster is provided by a 1 mm wide axial slot in the outer insulator wall. The majority of the ion velocity measurements used partially saturated fluorescence to improve the signal to noise ratio. Probe-based plasma potential measurements extend from 50 mm outside the thruster exit plane to the near anode region for all but the highest discharge voltage condition. For each condition, the axial electric field is calculated from the plasma potential, and the local electron temperature is determined from the difference between the floating and plasma potentials. These two sets of measurements delineate the structure of the plasma and indicate that the ionization and acceleration regions are somewhat separated. Also, these measurements indicate a region of low electric field near the thruster exit, especially at the higher discharge voltages. This region of near constant potential (low electric field) may be a result of oscillations which enhance the local plasma conductivity.
机译：这是一项基于发射探针的等离子体电势测量和霍尔推进器等离子放电加速通道的羽流和内部的中性和单电离氙气的激光诱导荧光测速技术的研究，其功率范围为250至725 W.测量了四个放电电压条件（100 V，160 V，200 V，250 V）的轴向离子和中性速度曲线，以及近场羽流中的径向离子速度曲线。推力器内部和外部的轴向离子速度测量以及推力器外部的径向速度测量都是使用激光感应荧光和非共振信号检测进行的。在霍尔推进器内部以共振荧光收集类似地执行中性轴向速度测量。绝缘子外壁上的一个1 mm宽的轴向槽提供了通往霍尔推进器内部的光学通道。大多数离子速度测量使用部分饱和的荧光来改善信噪比。除最高放电电压条件外，基于探针的等离子体电势测量值从推进器出口平面外的50 mm延伸至阳极附近。对于每种条件，根据等离子体电势计算轴向电场，并根据浮动电势与等离子体电势之间的差确定局部电子温度。这两组测量值描绘了等离子体的结构，并表明电离区和加速区在某种程度上是分开的。同样，这些测量结果表明推进器出口附近的电场低，特别是在较高的放电电压下。接近恒定电位（低电场）的区域可能是增强局部等离子体电导率的振荡的结果。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号