介质阻隔面放电的结构参数

Geometrical Parameter of Dielectric Barrier Surface Discharge

为提高介质阻隔面放电激励器的流动控制效果,采用漂移-扩散模型对9种电极结构的放电过程进行了数值计算,得到了随时间变化的放电空间电子数密度、电场、电极电流以及离子静电力,探索了等离子体放电的作用机理,研究了暴露电极、植入电极的宽度以及两个电极之间的间隙宽度对放电过程和放电效果的影响。结果表明,放电过程可能存在非线性作用,缩短暴露电极宽度、减小电极间隙能够提高放电效果,但电极最好不要重叠,电极间隙有一个最佳值;植入电极宽度存在最大值,超过该值会降低放电效果。计算结果与实验结果基本相符。

For improving the flow control effect of dielectric barrier surface discharge （DBDs） actuator, the discharge process of nine kinds of DBDs electrode geometrical configurations was simulated. The variation of electron number density, electric field, discharge current and ion electrostatic force with time were gained. Moreover, the DBDs flow control mechanism was explored. The influences of exposed electrode width, encapsulated electrode width and gap width between electrodes on discharge process and effect were studied. The results which are in agreement with the experimental ones show that the nonlinear action may take place in the discharge process; and the shorter exposed e- lectrode width and gap width can improve discharge effect, however, the discharge effect will degenerate if elec-- trodes are overlapped. So the gap width has an optimal value as well as the encapsulated electrode width has a maxi- mal value.