| Dielectric Barrier Discharge (DBD), also called silent discharge, can produce low temperature plasma with large size and high-energy density at normal atmosphere, which has achieved significant technological breakthroughs in many industrial fields. Besides the above characteristics, Surface Dielectric Barrier Discharge (SDBD), as a new kind of DBD, has competitive advantages in air flow control and bright prospects in many aerodynamics areas such as aircraft movements and wind power generation. Nowadays, SDBD has attracted much attention due to its economy, efficiency and high controllability, setting off a new upsurge in research. However, its physical process and function mechanism have not been well understood. Thus, it is of great theoretical significance and application value to study on SDBD about its characteristics and influencing factors.The discharge structure of SDBD and the experiment platform have been presented. Based on this experiment platform a series of researches have been carried out on its characteristics and influencing factors, with relevant theoretical analysis given.First of all, the discharge mechanism of SDBD and the principle of airflow acceleration are explored. Then, electrical characteristics and discharge pictures are analyzed, based on both symmetrical and asymmetrical electrode structures. Moreover, the method of computing discharge power is present. According to the discharge mechanism, the equivalent circuit is established, the calculation of equivalent parameters is pointed out, and the calculation formula of discharge power is deduced, which are proved to be right compared with Lissajous calculation method.Secondly, the influencing factors of SDBD are studied in the case of varied different applied voltages, frequencies, electrode widths, electrode gaps and relative dielectric constants. It is proved that the higher the applied voltage is, the more severe and uniform the discharge becomes, with the power increasing linearly. Frequency has complex effects on discharge characteristics. There is an optimal frequency in asymmetric structure, while the discharge of symmetric structure becomes more severe with the frequency increasing. At the same time, discharge wire clusters almost remain still under different frequencies. The smaller the electrode width and electrode gap are, the easier the discharge becomes and the more uniform the discharge wires are. In addition, there exists optimal electrode width and electrode gap, which makes the discharge more stable and uniform. Besides the bigger the relative dielectric constant is, the easier the discharge becomes and the less uniform the discharge wires are, with the power increasing linearly. |
