Discharge Characteristics And Application Researches Of Annular Surface Dielectric Barrier Discharge

Surface dielectric barrier discharge has large application prospects in flow control,anti-icing and deicing.It is a focus on how to optimize the configuration.In this paper,based on the annular surface dielectric barrier discharge actuator,the effects of different geometric parameters of actuators and parameters of power supply on discharge characteristics and characteristics of transported charges are studied.Based on a three-dimensional model,the distribution of external electric field in the discharge region is calculated.A time-varying lumped-element circuit model is brought up,and the characteristics of equivalent capacitance is analyzed.In addition,the application research is illustrated by the experiments of flow field and the falling snow.When applied to the high frequency and high voltage power supply,the displacement current varies with the power supply voltage according to the sinusoidal law,but there is a positive bias.However,the bias hardly changes with geometric parameters.Displacement current approximately linearly increases with power supply voltage and electrode-ring radius generated by microsecond-pulse power supply.When applied to different power sources,discharges present separated-channel,diffuse and a mixed discharge mode with the voltage increasing but discharge has no changes with frequencies increasing.Simultaneously,discharges present a mixed discharge mode of separated-channel discharge and diffuse discharge,while diffuse discharge is prominent in inward discharge,and separated-channel discharge is the majority of outward discharge.When grounding electrodes are segmented,discharge should happen at the covered areas,but the plasma spanwise-spread by two adjacent covered areas could fill the non-covered area with grounding electrodes are increasing.Therefore,it seems that the discharge plasma distributes in diffuse mode approximately on the whole dielectric surface under the 30-segment condition,and the discharge uniformity is even better than that under the unsegmented condition.Equivalent capacitance has no changes with voltages and frequencies increasing in dark and discharge phases,but increases with radius between inward and outward discharge.Equivalent capacitance under the unsegmented condition is larger than the30-segment condition.Meanwhile,a time-varying lumped-element circuit model is brought up,and equivalent capacitance in dark phases and in discharge phases discussed theoretically agree well with experiment results.The distribution of external electric field provides a good explanation of discharge channel development and plasma distribution at different conditions.When applied to high frequency and high voltage power supply,the induced airflow gradually develops from wall jet to turbulences in the center of the actuator under the optimal voltage amplitude and frequency.Combined with the snowfall results,it has a better influence.The development of induced airflow is controlled under outward discharge generated by different power sources.To conclude,discharge plasma with better performance can be obtained by suitable electrode arrangements.It has great significance that annular surface dielectric barrier discharge characteristics are studied in flow control and anti-icing and deicing.