Abstract
The quasi-steady body force field of Dielectric-Barrier-Discharge plasma actuator can be estimated by analyzing the time-sequence velocity field data. In this study, the effects of the time and spatial resolution in the velocity field data on the body force field estimation are investigated using the PIV measurement and numerical simulation. As a result of the investigation, following conclusions are obtained; (1) the time resolution is important for the accurate body force field estimation; lower time resolution generates positive and negative overestimation of the body force at the upstream and downstream of AC electrode edge, respectively, and the volume-integrated body force decreases at the lower time resolution, (2) the spatial resolution gives little effects on the overall characteristics of the force distribution; however, the volume-integrated body force increases at lower spatial resolution, and (3) the dominant error source of the body force field estimation are the calculation error of the pressure gradient term of the Navier-Stokes equation. The estimation errors in the pressure gradient can be reduced by higher time resolution.
Highlights
A dielectric barrier discharge plasma actuator (DBDPA) gets much attention in recent years as an advanced active flow control device
Both results from the Particle Image Velocimetry (PIV) and numerical simulation (CFD) are plotted in the figure
We focused on the body force estimation method proposed by Kotsonis et al and investigated the errors included in the estimated body force
Summary
A dielectric barrier discharge plasma actuator (DBDPA) gets much attention in recent years as an advanced active flow control device. When an AC voltage (typically, several kV and several kHz) is applied between the electrodes, the barrier discharge appears over the dielectric surface. The plasma particles are accelerated in the externally applied electric field, and they collide with the neutral molecules of ambient gas. The momentum transfer from the plasma particles to the neutral molecules results in the body force acting on the ambient gas. The body force generates a wall-surface jet, which can be utilized for control of the boundary layer flow
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