Active flow control over a backward-facing step using plasma actuation

Abstract

Due to the more stringent aviation regulations on fuel consumption and noise reduction, the interest for smaller and mechanically less complex devices for flow separation control has increased.Plasma actuators are currently among the most studied typology of devices for active flow control purposes due to their small size and lightweight. In this study, a single dielectric barrier discharge (SDBD) actuator is used on a backward-facing step to assess its effects on the separated turbulent shear layer and its reattachment location. A range of actuating modulation frequencies, related to the natural frequencies of shear layer instability (flapping) and vortex shedding instability, are examined. The particle image velocimetry technique is used to analyse the flow over the step and the reattachment location. The bulk-flow experiments show negligible effects both on the shear layer and on the reattachment location for every frequency considered, and the actuator is not able to induce a sufficient velocity increase at the step separation point. * Hossein. Zare-Behtash@glasgow.ac.uk

A plasma‐fluid model for EHD flow in DBD actuators and experimental validation

“…The DBD actuators are of immense interest for a variety of potential flow control applications from boundary layer control, drag reduction, boundary layer ingestion, wake control, and noise reduction. Several studies have also been carried out in the past to simulate EHD flow generated by DBD actuator with different models such as fluid, particle, and empirical models .…”

“…Recent studies on numerical modeling of DBD plasma actuators present the effects of DBD actuators on the flow over geometries such as an airfoil and a backward step . The analysis of quiescent flow and with freestream flow presents the charge density and discharge current variation along with instantaneous charge and velocity distribution plots.…”

“…Recent studies on numerical modeling of DBD plasma actuators present the effects of DBD actuators on the flow over geometries such as an airfoil and a backward step. 1,3,16,22 The analysis of quiescent flow 23 and with freestream flow 18 presents the charge density and discharge current variation along with instantaneous charge and velocity distribution plots. An experimental analysis of quiescent flow and flow control with plasma actuators, for an annular electrode, 24 was presented including velocity profiles of freestream flow along with the evolution of quiescent flow.…”

Optimized dielectric barrier discharge‐plasma actuator for active flow control in wind turbine

“…The aerodynamic profile alteration due to full intensity plasma activation would impose a detrimental fatigue loading of the rotor structure. Especially the unsteady fatigue aerodynamic loading of blades are rises exponentially . The binary plasma activation in low wind speed would have an adverse effect on the power output due to stalling of blades.…”

Наносекундная Ионизация Области Обтекания Прямоугольного Уступа Высокоскоростным Потоком

“…Поверхностные разряды могут быть использованы для управления пограничным слоем [4,5], включая зоны отрыва пограничного слоя на обтекаемой поверхности. Особое внимание уделяется управлению отрывом при обтекании уступов [6,7]. Импульсный объемный разряд может существенно изменить высокоскоростное течение в газодинамическом канале [8,9].…”