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首页> 外文期刊>Plasma Sources Science & Technology >Effect of duty cycle on pulsed discharge atmospheric pressure plasma: discharge volume and remnant electron density
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Effect of duty cycle on pulsed discharge atmospheric pressure plasma: discharge volume and remnant electron density

机译：占空比对脉冲放电大气压等离子体的影响：放电体积和残余电子密度

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摘要

Properties of atmospheric pressure plasmas sustained by a 5 kHz pulse power are investigated by adjusting the duty cycle from 10% to 80%. As a result of the decrease of the duty cycle, the upward trends are observed in the electron density and excitation temperature, however, the downward trend appears in the gas temperature. The spatially averaged model is applied to simulate the temporal evolutions of the electron density and temperature, further validated by the time-resolved experimental measurements. Since the discharge volume in the open-air conditions increases at higher duty cycles, the time-averaged electron density within the pulse-on period consequently declines. For shorter duty cycles, fewer charges remain for the next discharge, and a higher initial peak of the electron temperature appears. As a result, the time-averaged electron temperature within the pulse-on period increases. Both the experimental and simulation results suggest that the discharge volume of the atmospheric pressure plasma in the open air has a strong effect on the time-averaged electron density during the pulse-on period whereas the remnant electron density determines the time-averaged electron temperature within the pulse-on period. This work reveals the effective mechanisms for controlling the electron temperature and electron density of atmospheric pressure plasmas in open air by using short pulse driven discharges.
机译：通过将占空比从10%调整到80%，研究了5kHz脉冲功率下大气压等离子体的特性。由于占空比的降低，电子密度和激发温度呈上升趋势，而气体温度呈下降趋势。应用空间平均模型模拟了电子密度和温度的时间演化，并通过时间分辨实验测量进一步验证了模型的有效性。由于露天条件下的放电体积在更高的占空比下增加，因此脉冲开启周期内的时间平均电子密度随之下降。对于较短的占空比，在下一次放电中保留的电荷较少，并且出现较高的电子温度初始峰值。结果，脉冲接通周期内的时间平均电子温度增加。实验和模拟结果均表明，大气中大气压等离子体的放电体积对脉冲接通期间的时间平均电子密度有很大影响，而剩余电子密度决定了脉冲接通期间的时间平均电子温度。这项工作揭示了利用短脉冲驱动放电控制大气中大气压等离子体的电子温度和电子密度的有效机制。

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  • 作者

    B W Feng; X X Zhong; Q Zhang; Y F Chen; R YWang; Kostya (Ken) Ostrikov;

  • 作者单位

    State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 People's Republic of China;

    State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 People's Republic of China;

    State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 People's Republic of China;

    State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 People's Republic of China;

    State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 People's Republic of China;

    School of Chemistry and Physics Queensland University of Technology Brisbane QLD 4000 Australia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 等离子体物理学;
  • 关键词

    pulsed discharge; duty cycle; discharge volume; remnant electron density;

    机译：脉冲放电;占空比;放电体积;残余电子密度;

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