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首页> 外文期刊>Journal of Spacecraft and Rockets >Charge Neutralization and Direct Thrust Measurements from Bipolar Pairs of Ionic Electrospray Thrusters
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Charge Neutralization and Direct Thrust Measurements from Bipolar Pairs of Ionic Electrospray Thrusters

机译：离子电喷雾推力器双极对的电荷中和和直接推力测量

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摘要

Electrospray thrusters are unique in their ability to emit both positive and negative beams, each contributing similarly to thrust. Spacecraft charging could be prevented without a dedicated neutralizer if currents of simultaneously emitted opposing polarity beams were matched, despite a lack of implicit coupling between them. Both an active current-balance control circuit and a passive self-balancing configuration are discussed and evaluated experimentally. Tests are performed with a highly ionic electrospray source which includes a pair of machined porous glass electrospray emitter arrays in a single holder. In the passive configuration, unbalanced charge collection on a common floating extractor yields rapid charging toward artificially imposed 200 V limits without means for charge suppression, showing the unsuitability of that architecture. Active balancing of emitted currents was fully effective at charge neutralization during stable periods of emission yet insufficient during potential alternations. Methods to improve this approach are presented, including demonstrating beam current modulation at up to 450 Hz, Direct thrust measurements when simultaneously emitting opposing polarity beams of the ionic liquid 1-ethyl-3-methylimidazolium tetrauoroborate are presented. Direct thrust measurements up to 35 mu N were in excellent agreement with commanded levels and computations based on measured currents (up to 190 mu A) and voltages (up to 2100 V).
机译：电喷雾推进器的独特之处在于既可以发射正电子束，也可以发射负离子束，每个都与推力相似。如果同时发射的相反极性光束的电流匹配，尽管没有专门的中和器，也可以防止航天器充电，尽管它们之间没有隐含的耦合。讨论并评估了有源电流平衡控制电路和无源自平衡配置。使用高离子电喷雾源进行测试，该离子源在单个支架中包括一对机械加工的多孔玻璃电喷雾发射器阵列。在无源配置中，普通浮动提取器上的不平衡电荷收集会朝着人为施加的200 V限制快速充电，而没有抑制电荷的手段，这表明该体系结构是不合适的。在稳定的发射期间，发射电流的主动平衡在电荷中和方面完全有效，而在潜在的交替期间则不足。提出了改进此方法的方法，包括演示在高达450 Hz的情况下对电子束电流的调制，当同时发射离子液体1-乙基-3-甲基咪唑四氟硼酸酯的相反极性电子束时的直接推力测量。高达35μN的直接推力测量与命令水平和基于测得的电流（高达190μA）和电压（高达2100 V）的计算结果非常吻合。

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  • 来源
    《Journal of Spacecraft and Rockets》 |2018年第1期|54-65|共12页
  • 作者

    Courtney Daniel G.; Shea Herbert; Dannenmayer Kathe; Bulit Alexandra;

  • 作者单位

    Fed Inst Technol Lausanne, Microsyst Space Technol Lab, EPFL IMT LMTS, CH-2002 Neuchatel, Switzerland;

    Fed Inst Technol Lausanne, Microsyst Space Technol Lab, EPFL IMT LMTS, CH-2002 Neuchatel, Switzerland;

    European Space Technol Ctr, ESA ESTEC TEC MPE, NL-2201 AZ Noordwijk, Netherlands;

    European Space Technol Ctr, ESA ESTEC TEC MPE, NL-2201 AZ Noordwijk, Netherlands;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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