Effects of pulse polarity on nanosecond pulse driven dielectric barrier discharge plasma actuators

Abstract

Articles you may be interested inCapacitances and energy deposition curve of nanosecond pulse surface dielectric barrier discharge plasma actuator Rev. Sci. Instrum. 85, 053501 (2014); 10.1063/1.4871552 Competition between pressure effects and airflow influence for the performance of plasma actuators Phys. Plasmas 21, 053511 (2014); 10.1063/1.4880098Dielectric material degradation monitoring of dielectric barrier discharge plasma actuators Nanosecond pulse driven dielectric barrier discharge plasma actuators are studied in quiescent air using a power supply capable of producing negative and positive polarity waveforms. High voltage pulses are applied to the exposed electrode of typical asymmetric actuator geometry. In addition to polarity, the effects of pulse amplitude, actuator length, and dielectric thickness are also investigated. Schlieren images are used to estimate the relative near surface gas heating, while electrical measurements are acquired simultaneously. Negative polarity pulses develop slightly more energy per unit length for thin dielectrics, while positive polarity is slightly higher for thick dielectrics. In most cases, the difference in per unit length energy produced by positive and negative pulses on equivalent actuators is not outside the measurement uncertainty. Negative polarity pulses are found to produce a stronger pressure wave for a given peak voltage and pulse energy across the test matrix. Results indicate that the negative polarity pulse more efficiently couples electrical energy to the near surface gas as heat. This suggests negative polarity pulses may be preferred for aerodynamic flow control applications employing this actuator arrangement. V C 2014 AIP Publishing LLC. [http://dx.

Elongating the area of plasma/fluid interaction of surface nanosecond pulsed discharges

“…This topology is composed of a straight region at the top of an hemispheric region, this latter region being centered at the edge of the active electrode. This is typical of the pressure wave produced by a nanosecond DBD as already described in literature [8,12,16,23,26,28]. All of these publications suggest that the semispherical part of the wave is caused by the contribution of the fast energy released at the tip of the active electrode whereas the linear signature is directly correlated with the plasma propagation along the dielectric surface.…”

“…Good effectiveness has been demonstrated more specifically when the outer flow velocity is high [8,14]. As for DBD supplied by ac voltage, optimization of the electrode geometry or of the applied signal is expected to be a way to improve the performance of the nanosecond pulsed discharge [15,16]. Among these optimizations, the need for a large surface of plasma/fluid interaction is even more essential for plasma-assisted flow control implemented on aerodynamic model having realistic scale factor.…”

Simulation of Nanosecond Pulsed DBD Plasma Actuation with Different Rise Times

“…Discharge filaments generate stronger compression waves with higher speeds than a diffuse discharge . In the experiments by Dawson and Little, negative polarity pulses produce a stronger compression wave for a given peak voltage and pulse energy than positive pulses . Wu et al found that as the pressure decreases from 760 Torr to 5 Torr, the discharge mode changes from a filamentary type to a glow type at around 80 Torr.…”

Investigation of nanosecond-pulsed dielectric barrier discharge actuators with powered electrodes of different exposures

“…Moreau et al [7], for example, used a three-electrode configuration to increase the extension length up to the electrode gap, resulting in a 300% increase in the input energy from a current collected at the third electrode. Others [5,20,23] applied positive polarity pulses to investigate the effects of actuator parameters on the characteristics of gas heating generated in NS-DBD. Results from these studies suggested that dielectric thickness has little effect on flow control.…”