A relationship between electric potential distribution on a dielectric surface and electrohydrodynamic (EHD) force generation is experimentally investigated to improve the performance of dielectric-barrier-discharge (DBD) plasma actuators. Direct current (DC) biased repetitive pulses are applied to the DBD plasma actuator, which has two or three electrodes. Although the additional downstream exposed electrode has little effect on the electrical and optical characteristics of the DBD plasma actuator, the electric potential distribution strongly depends on the presence of the additional exposed electrode. Moreover, the saturation time of the surface charge is hundreds of milliseconds when the pulse repetition frequency is , showing a large difference in the time scale of surface DBD. We also demonstrated a significant improvement in the generation of ionic wind by adding an additional downstream exposed electrode owing to the prevention of the electric field screening. A concept that separates the ionization process and the acceleration process works properly for improving the performance of the DBD plasma actuators, but at the same time, the dynamics of the surface charge should be controlled so that a strong electric field is generated rather than the electric field being screened by surface charge.

通过实验研究介电表面上的电势分布与电流体动力学 (EHD) 力生成之间的关系，以提高介电势垒放电 (DBD) 等离子体致动器的性能。直流 (DC) 偏置重复脉冲应用于 DBD 等离子体致动器，该致动器具有两个或三个电极。尽管额外的下游暴露电极对 DBD 等离子体致动器的电学和光学特性影响很小，但电位分布强烈依赖于额外暴露电极的存在。而且，当脉冲重复频率为，显示表面 DBD 的时间尺度差异很大。由于防止电场屏蔽，我们还通过添加额外的下游暴露电极来证明离子风的产生有显着改善。将电离过程和加速过程分开的概念对于提高 DBD 等离子体致动器的性能很有效，但同时，应控制表面电荷的动态，以便产生强电场而不是电场。场被表面电荷屏蔽。