Abstract：Surface dielectric barrier discharge (SDBD) actuator with annular electrode structures present significant potential in fields such as flow control and wastewater treatment. However, these actuators are often subjected to water-covered conditions due to environmental factors, such as weather. Currently, most studies on water-covered SDBD actuators focus primarily on the impact of water on their application effectiveness, with limited analysis on the changes in discharge characteristics under water-covered conditions. The discharge characteristics of water-covered annular SDBD actuators under varying applied voltage amplitudes were investigated using microsecond pulse excitation. The study focused on analyzing the development of discharge channels and the effects of water droplets, incorporating theories of water droplet polarization and charge accumulation. The experimental setup consisted of a dielectric barrier made from a 1 mm thick epoxy resin plate with a relative dielectric constant of 4.2. High-voltage and ground electrodes, each 35 μm thick, were placed on the upper and lower surfaces of the dielectric, respectively, in a concentric circular configuration. The high-voltage electrode had a width of 5 mm, and the edges of both electrodes were aligned, with a radius of 10 mm. No horizontal spacing existed between the electrodes. Water droplets, precisely measured at a volume of 1 μL, were dispensed using a direct-entry propulsor. The droplets were released from a consistent height, allowing them to fall freely onto the dielectric surface, landing 2 mm away from the high-voltage electrode. Upon contact, the droplets formed a spherical crown shape with a contact angle of approximately 54°, a height of 0.2 mm, and a radius of around 0.75 mm. Experiments were conducted under atmospheric pressure, with electrical characteristics measured through high-voltage and current probes. Discharge images were captured using a Canon camera. Under water-covered conditions, the discharge characteristics during a single pulse revealed distinct changes. The peak discharge current occurred earlier, with the maximum current significantly reduced, and the number of current pulses decreased by about 40%. Additionally, the reverse discharge peak at the pulse's falling edge showed a notable increase. Discrete discharge channels were observed at both the upper and lower ends of the water droplet, but no channel formed directly over the droplet, as its surface acted as a barrier to the discharge. After 800 accumulated pulses, the discharge channels near the droplet's lower end brightened in comparison to other areas, and a noticeable shift of the channels toward the droplet's lower end was observed. With the increase in applied voltage amplitude, the brightness and shift of these channels intensified. However, the “blocking” phenomenon at the droplet's surface remained unaffected by the increase in voltage amplitude. The following conclusions can be drawn from the analysis: (1) The high dielectric constant of the water droplet causes the discharge channel, excited by the high-voltage electrode, to shift toward the water droplet as it develops radially, but it becomes "blocked" upon encountering the droplet. (2) The local electric field distortion caused by the difference in dielectric constants leads to multiple discharge initiation points at the upper end of the droplet. The mutual repulsion between the channels creates a dark area around the droplet. (3) Increasing the applied voltage amplitude enhances the brightness of the discharge channels at both the upper and lower ends of the water droplet and intensifies the channel's shift toward the droplet. (4) Due to the polarization characteristics, the water droplets accumulate charges during the rising edge of the pulse and release them at the falling edge, intensifying the collision ionization process of residual charges on the dielectric surface and enhancing the reverse discharge.
姜慧, 杨永杰, 龚子羿, 韩雨菲. 覆水工况下微秒脉冲激励环状表面介质阻挡放电特性研究[J]. 电工技术学报, 2025, 40(15): 4988-4998.
Jiang Hui, Yang Yongjie, Gong Ziyi, Han Yufei. Characteristics of Annular Surface Dielectric Barrier Discharge Based on Microsecond Pulse Excitation under Water-Covered Conditions. Transactions of China Electrotechnical Society, 2025, 40(15): 4988-4998.
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2025, Vol. 40 
