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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >On the propagation of streamers in electrical discharges
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On the propagation of streamers in electrical discharges

机译：关于流光在放电中的传播

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摘要

Streamers are non-thermal filamentary plasmas developing in insulating mediums under the influence of strong external electric fields. The present knowledge, based on a widely-accepted concept of critical or stability field introduced half a century ago, indicates the existence of a unique minimum electric field in which streamers could propagate stably with constant radius and velocity. In this work, we present a new understanding indicating that growing, decaying, and stable propagation of streamers is controlled not solely by the external field but also by the physical dimensions of streamers. Stable propagation is demonstrated to be achievable in a wide range of electric fields, with a lower limit of ～5 kV cm~(-1) for positive streamers and ～10 kV cm~(-1) for negative streamers in air at atmospheric pressure, up to the breakdown field ～28.7 kV cm~(-1). In these field ranges, the streamer radius required for stable propagation is inversely proportional to the external field, with larger and smaller initial radii, respectively, leading to growing and decaying streamers. The new mechanism suggests possible ways to flexibly control the streamer parameters in applications, such as changing the size and potential of the point electrode to obtain the required initial streamer dimensions for the desired propagation pattern.
机译：拖缆是在强外部电场影响下在绝缘介质中发展的非热丝状等离子体。基于半个世纪前引入的临界或稳定场的广泛接受的概念，当前的知识表明存在唯一的最小电场，在该电场中，拖缆可以以恒定的半径和速度稳定地传播。在这项工作中，我们提出了一种新的理解，即表明拖缆的生长，衰减和稳定传播不仅受外部场的控制，还受拖缆的物理尺寸的控制。在大范围的电场中，稳定的传播是可以实现的，在大气压力下，正流的下限为〜5 kV cm〜（-1），负流的下限为〜10 kV cm〜（-1）。 ，直至击穿场〜28.7 kV cm〜（-1）。在这些场范围内，稳定传播所需的拖缆半径与外场成反比，初始半径分别较大和较小，导致拖缆的生长和衰减。新机制提出了在应用中灵活控制拖缆参数的可能方法，例如更改点电极的大小和电势以获得所需传播模式所需的初始拖缆尺寸。

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