Towards In-Flight Applications? A Review on Dielectric Barrier Discharge-Based Boundary-Layer Control

Particle image velocimetry measurements in close proximity to dielectric-barrier discharge plasma actuators are conducted to quantify the momentum transfer of the plasma to the surrounding air flow. Based on these data a comparative analysis of six existing approaches to estimate the induced body force is presented. Integral methods calculate an integral value for the actuator force based on the momentum-balance equation. Insight into the spatial distribution of the body force is provided by differential methods, which are based either on the Navier–Stokes equations or on the vorticity equation. It is demonstrated that the intensity as well as the domain of the force increase with increasing operating power levels. Emphasis is also placed on the issue of self-induced drag. It is shown that 30% of the induced momentum is consumed by wall friction. All results are validated with previously obtained balance force data and luminosity analysis of identical actuators.

http://iopscience.iop.org/article/10.1088/0022-3727/46/5/055202/pdf

Velocity-information-based force-term estimation of dielectric-barrier discharge plasma actuators

Heat generation mechanisms of DBD plasma actuators

Modified split-potential model for modeling the effect of DBD plasma actuators in high altitude flow control

Flow separation control over an airfoil using dual excitation of DBD plasma actuators

Experimental and computational study of the flow induced by a plasma actuator

Simultaneous measurements of the phase-averaged velocity distribution and the underlying discharge quantities of a dielectric barrier discharge plasma actuator (PA) are performed at 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.

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

The present work is concerned with development of a new model for the momentum transfer due to plasmaactuator in aerodynamic flow-control applications. A comparative analysis of different volume-force estimation strategies is provided, focussing particularly on the phenomenological and experiment-based approaches. The main objective of the present study is a comprehensive evaluation of these models aiming at derivation of a new model formulation of improved accuracy. All models are implemented into the OpenFOAM code. The models are validated within the RANS framework applied under the quiescent-air conditions by solving the Reynolds equations, closed by a near-wall second-moment closure model based on the homogeneous dissipation rate of the kinetic energy of turbulence. The computationally obtained velocity distribution induced by the wall-mounted plasma actuator is analyzed within the wall-jet flow region along with the experimental PIV data of identical actuator operating conditions. The results demonstrate the improved accuracy of the new empirical model as a first step towards a universal plasma-actuator model for flow-control simulations by means of CFD. 1 BACKGROUND AND MOTIVATION Plasma actuator for the aerodynamic flow control describes a DBD-based actuator (DBD: dielectric barrier discharge) generating an electric discharge between two parallel electrodes separated by an insulating dielectric material (barrier): a grounded electrode and the radio-frequency high-voltage one the upper surface of the latter being coincident with the wall surface. Consequently an electric field originating from the exposed high-voltage electrode will ionize weakly the surrounding air (surface plasma generation) and inHV (a) quiescent air HV

Derivation of a Plasma-ActuatorModel Utilizing Quiescent-Air PIV Data

This article discusses the suitability of deriving the force density distributions produced by plasma actuators using velocity field data obtained experimentally by Particle Image Velocimetry (PIV). It is argued that the Navier-Stokes equations (NS) are not correct choice, since the requirements for their application are not met by the time-averaged properties of the available velocity field. The Reynolds Averaged Navier Stokes Equation (RANS) are considered more appropriate in which case the Reynolds stress components must also be accounted for in calculating the force density distribution.

Evaluating force field induced by a plasma actuator using the Reynolds-Averaged Navier Stokes Equation

A computational study is presented of the enhancement of pressure recovery in a three-dimensional diffuser by using plasma actuators, as experimentally investigated by Grundmann et al., Exper. Fluids 50, (1), 217–231 (2011). The flow configuration utilizes a streamwise-oriented arrangement of dielectric barrier discharge (DBD) plasma actuators mounted on the top wall of the inflow duct. Spanwise motion directed towards the duct corners was generated, modifying the inflow with locally intensified turbulence. The most advantageous enhancement was achieved using an actuator pulsed with 40 % duty cycle. For comparison an actuator operating continuously (100 % duty cycle) was also considered. The present computational study examines both cases, comparing them to the baseline configuration with no actuation. Simulations were performed within the scale-adaptive version of the Unsteady RANS (Reynolds-Averaged Navier Stokes) framework by using an eddy-resolving second-moment closure as the turbulence model. The plasma actuator was represented using a spatial body-force distribution based on PIV (Particle Image Velocimetry) measurements of the flow induced by a plasma actuator, Kriegseis et al., J. Phys. D: Appl. Phys. 48, 329401 (2015). The results obtained for both pressure-recovery enhancement and suppression correlate well with the experimental findings.

Plasma-actuated Manipulation of Secondary Flow Towards Pressure Recovery Enhancement in a 3D Diffuser Modelled by an Eddy-resolving Second-moment Closure

I. Maden

Papers

Experimental and computational study of the flow induced by a plasma actuator

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

Derivation of a Plasma-ActuatorModel Utilizing Quiescent-Air PIV Data

Evaluating force field induced by a plasma actuator using the Reynolds-Averaged Navier Stokes Equation

Plasma-actuated Manipulation of Secondary Flow Towards Pressure Recovery Enhancement in a 3D Diffuser Modelled by an Eddy-resolving Second-moment Closure