A self-consistent model of ionic wind generation by negative corona discharges in air with experimental validation
A self-consistent model of ionic wind generation by negative corona discharges in air with experimental validation
复制标题
空气中负电晕放电产生离子风的自洽模型并经过实验验证
DOI：
10.1088/1361-6595/aa86b8
复制
发表时间：
2017-08
影响因子：
3.8
通讯作者：
Nijdam S.
中科院分区：
文献类型：
--
作者：
Chen She;Nobelen J. C. P. Y.;Nijdam S.
当气体离子在电场中加速并通过碰撞将其动量传递给中性分子时，电晕放电产生离子风。这种技术是有前途的，因为可以产生气流而不需要移动部件，并且可以容易地小型化。离子风的基本理论听起来很简单，但细节还远不清楚。在我们的实验中，一个负的直流电压施加到针-圆柱电极几何形状。热线风速仪用于测量圆柱体下游出口处的流速。随着电压的增加，流速有波动，但平均流速增加。电流由具有短上升时间的规则脉冲串组成，即众所周知的Trichel脉冲。为了揭示Trichel脉冲阶段的离子风机制，建立了一个与气体动力学耦合的三组分电晕模型。在COMSOL Multiphysics中求解等离子体的漂移扩散方程和流动的Navier-Stokes方程。采用自洽模型详细计算了电场、带电粒子净数密度、电流体动力学（EHD）体积力和流速。采用多个时间尺度：数百微秒的等离子体特性和更长的时间尺度（100秒）的流动行为。我们发现，流速以及EHD体力有相反的方向，在电离区靠近尖端和离子漂移区远离尖端。计算的平均电流、Trichel脉冲频率和流速与实验结果非常接近。此外，在我们的模拟中，我们能够再现实验中观察到的蘑菇状微型射流。
Ionic wind is produced by a corona discharge when gaseous ions are accelerated in the electric field and transfer their momentum to neutral molecules by collisions. This technique is promising because a gas flow can be generated without the need for moving parts and can be easily miniaturized. The basic theory of ionic wind sounds simple but the details are far from clear. In our experiment, a negative DC voltage is applied to a needle-cylinder electrode geometry. Hot wire anemometry is used to measure the flow velocity at the downstream exit of the cylinder. The flow velocity fluctuates but the average velocity increases with the voltage. The current consists of a regular train of pulses with short rise time, the well-known Trichel pulses. To reveal the ionic wind mechanism in the Trichel pulse stage, a three-species corona model coupled with gas dynamics is built. The drift-diffusion equations of the plasma together with the Navier–Stokes equations of the flow are solved in COMSOL Multiphysics. The electric field, net number density of charged species, electrohydrodynamic (EHD) body force and flow velocity are calculated in detail by a self-consistent model. Multiple time scales are employed: hundreds of microseconds for the plasma characteristics and longer time scales (∼1 s) for the flow behavior. We found that the flow velocity as well as the EHD body force have opposite directions in the ionization region close to the tip and the ion drift region further away from the tip. The calculated mean current, Trichel pulse frequency and flow velocity are very close to our experimental results. Furthermore, in our simulations we were able to reproduce the mushroom-like minijets observed in experiments.
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影响因子：
1.8
作者：
Kim, C.;Park, D.;Hwang, J.
通讯作者：
Hwang, J.
DOI：
10.2514/6.2007-4611
发表时间：
2007-06
期刊：
--
影响因子：
--
作者：
P. Bérard;D. Lacoste;C. Laux
通讯作者：
P. Bérard;D. Lacoste;C. Laux
影响因子：
3.8
作者：
K. Takashima;Z. Yin;I. Adamovich
通讯作者：
K. Takashima;Z. Yin;I. Adamovich
DOI：
10.1016/j.ijheatmasstransfer.2012.10.015
发表时间：
2013-01
影响因子：
5.2
作者：
I. Chen;M. Guo;Kai-Shing Yang;Chi-Chuan Wang
通讯作者：
I. Chen;M. Guo;Kai-Shing Yang;Chi-Chuan Wang
影响因子：
1
作者：
P. Béquin;K. Castor;J. Scholten
通讯作者：
P. Béquin;K. Castor;J. Scholten