Interrelation of phase-averaged volume force and capacitance of dielectric barrier discharge plasma actuators

Abstract

Simultaneous measurements of the phase-averaged velocity distribution and the underlying discharge quantities of a dielectric barrier discharge plasma actuator (PA) are performed at $10~\text{k}\text{Hz}$ discharge frequency to investigate the interplay of the discharge and the surrounding flow. The underlying velocity information for the force estimation is obtained by means of phase-averaged particle image velocimetry; the discharge quantities are determined from a Lissajous-figure analysis. The results uncover a clear cause–effect relation between the phase-dependent effective discharge capacitance of the PA and the resulting spatiotemporal volume-force distributions. From this novel insight, it must be concluded that the instantaneous effective discharge intensity dominates the momentum-transfer rate rather than the formerly assumed operating voltage.

PIV-based dynamic model of EHD volume force produced by a surface dielectric barrier discharge

“…This approach has been used to determine the mean F as depicted in Figure 4. The spatial distribution and amplitude of F correspond both to the results of the literature [22,23,24,28]. For the horizontal force component F x , its mean value is strictly positive in the region of the discharge.…”

“…The time-dependent behavior of the EHD volume force has been estimated by reversing the Navier-Stokes equations as done in [26][27][28]. In view of the use of this force as a source term in a numerical CFD solver, a reduced order model has been defined.…”

“…It is considered that the pressure contribution is minor regarding the volume force produced by the discharge as in [20,21,25,27]. This point has been discussed in Brauner et al [28] and it was shown that the pressure gradient can contribute to the mean EHD volume force. The contribution of the pressure gradient in the computation of the EHD force has also been partially discussed in the pioneering work of [22].…”

“…In most of the cases, time-averaged velocity fields are measured, but phase-averaging procedure can also be used to recover the dynamic aspects of the EHD volume force [26][27]. Another method consists of measuring the produced flow by time-resolved PIV and by computing the corresponding time-resolved volume force as recently reported in [28]. This type of time-resolved evaluation of the volume force distribution can be helpful to define a reduced order model of the EHD force production.…”

Characterization of surface dielectric barrier discharge (SDBD) based on PI/Al2O3 nanocomposite

“…Recently, Kriegseis et al put forward a powerful diagnostic method by using Lissajous figure to measure the plasma actuator's power consumption and capacitance. This method was further adopted to evaluate the effects of ambient environment on the performances of SDBD actuators and study the interrelation between phase‐averaged volume force and capacitance of SDBD PAs . Hanson et al quantified the changes in both the power consumption and capacitance of the PI based actuators over long operating durations, and he found an increase in the power consumption, which was also accompanied by increase of effective capacitance and degradation (thinning) of dielectric layer.…”