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A model for macro-performances applied to low power coaxial pulsed plasma thrusters

机译：适用于低功率同轴脉冲等离子推进器的宏性能模型

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摘要

Pulsed plasma thrusters (PPT), as an important developing direction of micro-satellite propulsion system, are attracting more and more attention. Low power coaxial PPT has great advantages in miniaturization because of its coaxial structure, which is beneficial for micro-satellite applications. Since there are few macro-performances estimation model in low power coaxial PPT, this paper establishes a model based on one-dimensional electromechanical PPT model and gas dynamic pressure forces model to describe macro-performances of low power coaxial PPT. In this model, the electromechanical model describes the plasma electromagnetic acceleration process, current and voltage changes of the main circuit during the discharge process, and the gas dynamic pressure forces model describes the expansion and acceleration of the neutral gas group in the discharge channel. To verify the model, we compared the voltage and current obtained from model simulation with the experimental results, and compared the impulse bit measured in the experiment with the impulse bit calculated by the model. The results show that the model established in this paper can well simulate the variation of voltage and current during the working process of low power coaxial PPT, and can preliminarily estimate the macro performances of the thruster.
机译：脉冲等离子推进器（PPT）作为微卫星推进系统的重要发展方向，正受到越来越多的关注。低功率同轴PPT由于其同轴结构而在小型化方面具有很大优势，这对微卫星应用是有利的。由于低功率同轴PPT的宏观性能评估模型很少，本文建立了基于一维机电PPT模型和气体动压力模型的模型来描述低功率同轴PPT的宏观性能。在该模型中，机电模型描述了等离子体电磁加速过程，放电过程中主电路的电流和电压变化，而气体动压力模型则描述了放电通道中中性气体群的膨胀和加速。为了验证模型，我们将模型仿真获得的电压和电流与实验结果进行了比较，并将实验中测得的脉冲位与模型计算出的脉冲位进行了比较。结果表明，本文建立的模型可以很好地模拟低功率同轴PPT工作过程中电压和电流的变化，并可以初步估算推进器的宏观性能。

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  • 来源
    《Acta astronautica》 |2020年第5期|154-162|共9页
  • 作者

  • 作者单位

    Beijing Inst Technol Sch Aerosp Engn Beijing 100081 Peoples R China;

    Tianjin Inst Power Sources Tianjin 300384 Peoples R China;

    Shanghai Aerosp Control Technol Inst Shanghai 201109 Peoples R China;

  • 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
  • 中图分类
  • 关键词

    Coaxial pulsed plasma thruster; Model simulation; Macro-performances estimation;

    机译：同轴脉冲等离子推进器;模型仿真;宏观绩效评估;

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