Numerical simulation of a plasma actuator based on ion transport
Numerical simulation of a plasma actuator based on ion transport
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基于离子输运的等离子体致动器的数值模拟
DOI：
10.1063/1.4809975
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发表时间：
2013
影响因子：
3.2
通讯作者：
K. Fukagata
中科院分区：
文献类型：
--
作者：
Seiya Yamamoto;K. Fukagata
对单个介质阻挡放电等离子体致动器 (PA) 周围的离子传输和流动进行二维数值模拟。通过求解一价正离子、一价负离子和电子的输运方程，得到离子和电子的空间分布及其时间演化。假设驱动交流信号的电压和频率分别为8kV和5kHz。特别关注电压梯度 dV/dt 对体力大小的影响。还检验了流动模拟中常用的稳态力模型的有效性。仿真结果表明，PA引起的体力大小随着电压梯度dV/dt的增加而增加，并且在较高电压下其增加幅度变得更缓和。从离子和电子数密度场的时间演化来解释体积力产生的机制。使用时间分辨体力和时间平均模型进行的流动模拟之间的比较表明，当流动的时间尺度比 PA 的时间尺度大 30 倍以上时，时间平均模型可以给出足够准确的结果。
Two-dimensional numerical simulation of ion transport and flow around a single dielectric barrier discharge plasma actuator (PA) is performed. Spatial distributions of ions and electrons as well as their time evolution are obtained by solving the transport equations of monovalent positive ions, monovalent negative ions, and electrons. Voltage and frequency of the driving alternating-current signal are assumed to be 8 kV and 5 kHz, respectively. Special focus is laid upon the effect of voltage gradient dV/dt on the magnitude of the body force. The validity of steady force models often used in flow simulation is also examined. The simulation results show that the magnitude of the body force induced by the PA increases as the voltage gradient dV/dt increases and its increase rate becomes milder at higher voltage. The mechanism of body force generation is explained from the time evolution of number density fields of ions and electrons. A comparison between flow simulations using a time-resolved body force and its time-averaged counterpart demonstrates that the time-averaged model gives sufficiently accurate results when the time scale of the flow is more than 30 times greater than that of the PA.