The dynamic characteristics of dielectric barrier discharge patterns under Karman vortex on atmospheric airflow

Dielectric barrier discharge (DBD) has received more and more attention due to its wide application in many industrial applications, such as medical treatment, materials processing, and environment protection. The coupling of airflow and discharge is an important issue, such as the influence of flow velocities on discharge characteristics and the influence of discharge on airflow characteristics have been extensively studied. In this paper, the airflow of the periodic Karman vortex is constructed and the influence of the airflow on the discharge pattern is studied. Through measuring the discharge signal and relative light intensity under the Karman vortex, it is found that the discharges in the vortex areas are more vulnerable to breakdown and the relative light intensities of the discharges are stronger. In the front of the cylindrical section, the discharge pattern shows the discharge filament following the incoming flow direction. At the rear of the cylindrical section, the discharge pattern is presented as curved discharge wire configuring two rows of vortexes. The dynamic characteristics show that two rows of vortexes are generated and separated alternately, and each row of the vortex is also regularly generated and separated. The movement law of the discharge patterns is basically the same as the Karman vortex simulation. The variation characteristics of the airflow can be basically reflected in the discharge patterns. The dynamic characteristics of dielectric barrier discharge patterns are related to the changes of the spatial domains of the Karman vortex constructed in this paper.