Forcing mechanisms of dielectric barrier discharge plasma actuators at carrier frequency of 625 Hz

Abstract

The forcing behavior of a dielectric barrier discharge (DBD) actuator is investigated experimentally using a time-resolved particle image velocimetry (PIV) system in conjunction with a phase shifting technique. The spatio-temporal evolution of the induced flowfield is accurately captured within one high voltage (HV) cycle allowing the calculation of the instantaneous velocity and acceleration. Additional voltage and current measurements provide the power consumption for each case. Four different applied voltage waveform shapes are independently tested, namely, sine, square, positive sawtooth, and negative sawtooth at fixed applied voltage (10 kV pp ) and carrier frequency (625 Hz). The instantaneous flowfields reveal the effect of the plasma forcing during the HV cycle. Sine waveform provides large positive forcing during the forward stroke, with minimal but still positive forcing during the backward stroke. Square waveform provides strong and concentrated positive and negative forcing at the beginning of the forward and backward stroke, respectively. Positive sawtooth provides positive but weak forcing during both strokes while the negative sawtooth case produces observable forcing only during the forward stroke. Results indicate the inherent importance of negative ions on the force production mechanisms of DBD's. Furthermore, the revealed influence of the waveform shape on the force production can provide guidelines for the design of custom asymmetric waveforms for the improvement of the actuator's performance.

Electrical and mechanical characteristics of surface AC dielectric barrier discharge plasma actuators applied to airflow control

“…Quantitative optical diagnostic such as laser Doppler velocimetry (LDV) can provide a localized time-resolved view of the induced flow field (Benard and Moreau 2012;Kotsonis and Ghaemi 2011). Results presented in Fig.…”

“…Another manner is to reconstruct phase-averaged velocity fields from non-time-resolved measurements. To our knowledge, three groups conducted this type of analysis (Debien et al 2012a;Kotsonis and Ghaemi 2011;Joussot 2011). Kotsonis and Ghaemi (2011) studied the time history of the flow produced by a 110-µm-thick Kapton actuator.…”

“…To our knowledge, three groups conducted this type of analysis (Debien et al 2012a;Kotsonis and Ghaemi 2011;Joussot 2011). Kotsonis and Ghaemi (2011) studied the time history of the flow produced by a 110-µm-thick Kapton actuator. From phase-averaged velocity fields, they extracted the horizontal and vertical components of the electric wind velocity, at x = 2 mm and y = 0.2 mm (Fig.…”

“…From Kotsonis and Ghaemi (2011) optimization of the waveform is a way to increase the actuator performances. This was investigated in Abe et al (2007).…”

Vortex shedding noise reduction by single dielectric barrier discharge plasma actuators

“…The purpose of the dielectric material is to prevent arc-occurrence between the two electrodes, and to allow for discharge accumulation near the exposed electrode 13,14 . When high AC voltage of ~ kV with typical sinusoidal waveform, and high frequency of ~ kHz are supplied, strong electric field is generated between the two electrodes.…”