Investigation of electric wind speed of multi-stack surface DBD plasma flow actuator operating in atmospheric air

Abstract

In high-pressure plasmas, charged particles accelerated by the electric field generally transfer their momentum to neutral gas particles through collision, thereby generating a neutral gas flow called electric wind. The plasma flow actuator for generating such an electric wind has the unique advantage of generating gas flow with a short reaction time in a simple structure without a mechanical part or combustion. For this reason, feasibility studies have been conducted using the plasma flow actuator in the cooling or flow control field. And it is necessary to investigate the attainable range of the electric wind speed to determine the proper application field of the plasma flow actuator. This thesis presents a multi-stack surface dielectric barrier discharge plasma flow actuator in which several surface dielectric barrier discharges (surface DBD) are arranged, and the electric wind speed was investigated. By adjusting the plate arrangement and driving condition of the multi-stack plasma flow actuator, the electric wind of 4.2 m∙s-1 occurred. It was about 3 times higher than the electric wind speed of 1.3 m∙s- 1 in a single SDBD. The plasma flow actuator generating the maximum electric wind speed of 4.2 m∙s- 1 consumed 107 W, and 111 W/m of power was consumed per unit discharge length. Through the multistack plasma actuator presented in this study, it was confirmed that the electric wind speed increased while maintaining the power consumption per discharge length. Further research should investigate the distribution of electric wind velocity and plasma characteristics based on the investigation of the multistack plasma flow actuator presented in the thesis. By developing a numerical model to predict them, it will be possible to present a plasma flow actuator that can generate appropriate electric wind depending on the application field.