01. Experimental/Computational Fluid Dynamics

Dielectric Barrier Discharge Plasma Actuator (DBD-PA) is a flow control device using ionic wind induced by atmospheric discharge. DBD-PA having two AC electrodes facing each other is called Vortex-Generator-type PA (VG-PA), which enhances the discharge compared to the conventional DBD-PA. The mechanism of discharge enhancement is considered to be an increase in the residual charge on the dielectric surface compared to that of the conventional DBD-PA. However, no experimental investigation has yet been conducted to support this hypothesis. Therefore, this study aims to experimentally clarify the relationship between surface charging and discharge length of VG-PA, and the induced flow characteristics. To achieve this aim, we conducted the Particle Image Velocimetry (PIV) measurement of ionic wind induced by VG-PA and the Pockels measurement of surface charging. As a result, it was found that the momentum flow rate of the jet changed with the change in the distance between the AC electrodes and there is the electrode distance achieving the peak value. In addition, Pockels measurements confirmed an increase in surface residual charge, but not the discharge enhancement associated with the increase in surface residual charge.

Hiroyuki NISHIDA

Prof.