Abstract
In this paper, a dynamic stall control scheme for vertical-axis wind turbine (VAWT) based on pulsed dielectric-barrier-discharge (DBD) plasma actuation is proposed using computational fluid dynamics (CFD). The trend of the wind turbine power coefficient with the tip speed ratio is verified, and the numerical simulation can describe the typical dynamic stall process of the H-type VAWT. The tangential force coefficient and vorticity contours of the blade are compared, and the regular pattern of the VAWT dynamic stall under different tip speed ratios is obtained. Based on the understanding the dynamic stall phenomenon in flow field, the effect of the azimuth of the plasma actuation on the VAWT power is studied. The results show that the azimuth interval of the dynamic stall is approximately 60° or 80° by the different tip speed ratio. The pulsed plasma actuation can suppress dynamic stall. The actuation is optimally applied for the azimuthal position of 60° to 120°.
Highlights
Dielectric-barrier-discharge (DBD) plasma actuation is an active flow control technology developed in the mid-1960s [1]
The dynamic stall phenomenon can be removed by unsteady pitch control of the blade and the boundary layer separation [5]
Dynamic stall is an inherent feature of vertical-axis wind turbine (VAWT)
Summary
Dielectric-barrier-discharge (DBD) plasma actuation is an active flow control technology developed in the mid-1960s [1]. The actuator is a plasma-generating device, which is composed of two electrodes, dielectric between the electrodes, and an external high voltage power source. Due to the asymmetry of the electrode arrangement, the ions move in an orientated direction within the electric field, generating a body force that drives the neutral gas molecules to produce a tangential jet, achieving boundary layer flow control. DBD plasma actuation has good performance in boundary layer flow separation control [2], dynamic stall vortex control [3], and so on [4]. The dynamic stall phenomenon can be removed by unsteady pitch control of the blade and the boundary layer separation [5]. Dynamic stall is an inherent feature of VAWT. The angle of attack and relative speed of a blade are changing dramatically during each VAWT rotation cycle
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