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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Filamentary surface plasma discharge flow length and time scales
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Filamentary surface plasma discharge flow length and time scales

机译：丝状表面等离子体放电流量长度和时间尺度

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摘要

Nanosecond surface dielectric barrier discharges (ns-SDBDs) are a class of plasma actuators that utilize a high-voltage pulse of nanosecond duration between two surface-mounted electrodes to create an electrical breakdown of air, along with rapid heating. These actuators usually produce multiple filaments when operated at high pulse frequencies, and the rapid heating leads to the formation of shock waves and complex flow fields. In this work we replicate a single filament of the ns-SDBDs and characterize the induced flow using velocity measurements from particle image velocimetry and density measurements from background-oriented schlieren. The discharge is produced by a high voltage electrical pulse between two copper electrodes on an acrylic base. A hot gas kernel characterizes the flow field formed close to the electrodes that expands and cools over time and a vortex ring that propagates away from the surface while entraining cold ambient fluid. The gas density deficit inside the kernel displays a power-law decay over time. Based on the observations, we develop a simplified theoretical model based on vortex-driven cooling and perform a scaling analysis to obtain the induced flow length and time scales. The results show that the cooling process's time scales correspond to a circulation-based time scale of the vortex ring, and the length scale of the kernel corresponds to the vortex ring radius. These findings can guide the choice of optimal filament spacing and pulse frequencies in the design, deployment, and operation of ns-SDBDs for flow control.
机译：纳秒表面介质阻挡放电（ns-SDBDs）是一类等离子体激励器，它利用两个表面安装电极之间持续纳秒的高压脉冲，在快速加热的同时产生空气击穿。这些致动器在高脉冲频率下工作时通常会产生多个细丝，快速加热导致冲击波和复杂流场的形成。在这项工作中，我们复制了ns SDBDs的单丝，并使用粒子图像测速仪的速度测量和背景纹影仪的密度测量来表征诱导流。放电是由丙烯酸基底上两个铜电极之间的高压电脉冲产生的。热气核的特征是在电极附近形成的流场随时间膨胀和冷却，以及在夹带冷环境流体的同时远离表面传播的涡环。内核内的气体密度差随时间呈幂律衰减。根据观测结果，我们建立了一个基于涡驱动冷却的简化理论模型，并进行了标度分析，以获得诱导流长度和时间标度。结果表明，冷却过程的时间尺度对应于涡环的基于循环的时间尺度，而核的长度尺度对应于涡环的半径。这些研究结果可以指导ns SDBDs流量控制设计、部署和运行中最佳灯丝间距和脉冲频率的选择。

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