Flow control of a D-shaped bluff body using different DBD plasma actuators

Chen, Zongnan; Wen, Chih-Yung

doi:10.1016/j.jfluidstructs.2021.103292

Cited by 13 publications

(2 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Promptly, several researchers started to focus on their study due to their interesting features including fast response times, the possibility of fabrication with low-cost materials, low weight, and easy implementation even on curved surfaces. Since then, various studies have been performed demonstrating the potential of plasma actuators for active flow control such as the dynamic control of unsteady flow separation [4,5], turbulent boundary layer control [6,7], aircraft noise reduction [8], bluff body flow control [9,10], velocity fluctuation adjustment [11][12][13], drag reduction in vehicles [14,15], etc. In addition, researchers revealed that plasma actuators produce considerable thermal effects during their operation, which can be used for icing mitigation [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Plasma Actuators Based on Alumina Ceramics for Active Flow Control Applications

Rodrigues,

Shvydyuk,

Nunes-Pereira

et al. 2024

Ceramics

View full text Add to dashboard Cite

Plasma actuators have demonstrated great potential for active flow control applications, including boundary layer control, flow separation delay, turbulence control, and aircraft noise reduction. In particular, the material used as a dielectric barrier is crucial for the proper operation of the device. Currently, the variety of dielectrics reported in the literature is still quite restricted to polymers including Kapton, Teflon, poly(methyl methacrylate) (PMMA), Cirlex, polyisobutylene (PIB) rubber, or polystyrene. Nevertheless, several studies have highlighted the fragilities of polymeric dielectric layers when actuators operate at significantly high-voltage and -frequency levels or for long periods. In the current study, we propose the use of alumina-based ceramic composites as alternative materials for plasma actuator dielectric layers. The alumina composite samples were fabricated and characterized in terms of microstructure, electrical parameters, and plasma-induced flow velocity and compared with a conventional Kapton-based actuator. It was concluded that alumina-based dielectrics are suitable materials for plasma actuator applications, being able to generate plasma-induced flow velocities of approximately 4.5 m/s. In addition, it was verified that alumina-based ceramic actuators can provide similar fluid mechanical efficiencies to Kapton actuators. Furthermore, the ceramic dielectrics present additional characteristics, such as high-temperature resistance, which are not encompassed by conventional Kapton actuators, which makes them suitable for high-temperature applications such as turbine blade film cooling enhancement and plasma-assisted combustion. The high porosity of the ceramic results in lower plasma-induced flow velocity and lower fluid mechanical efficiency, but by minimizing the porosity, the fluid mechanical efficiency is increased.

show abstract

Section: Introductionmentioning

confidence: 99%

Plasma Actuators Based on Alumina Ceramics for Active Flow Control Applications

Rodrigues,

Shvydyuk,

Nunes-Pereira

et al. 2024

Ceramics

View full text Add to dashboard Cite

show abstract

“…Active flow control has been widely applied to improve aerodynamic performance, including the elimination of flow separation on an airfoil, 2,3 drag reduction, 4,5 noise control, 6,7 and suppression of the vortexinduced vibration of structures. 8,9 Typically, the working principle of plasma actuators is based on forming a low-temperature plasma through ionizing gas molecules between a pair of electrodes under a high voltage. Various plasma actuators are used based on different discharge types, such as corona, dielectric barrier, and spark discharges.…”

Section: Introductionmentioning

confidence: 99%

Thermal effects on the performance of a nanosecond dielectric barrier discharge plasma actuator at low air pressure

2023

Self Cite

View full text Add to dashboard Cite

The thermal effects of a pulsed nanosecond dielectric barrier discharge plasma actuator with varying pulse voltages and pulse repetitive frequencies under different air pressures ranging from 0.1 to 1 bar are studied experimentally. The filamentary streamers extend along the radius direction, forming a thicker yet more stable and uniform plasma region due to the increasing ionized volume yielded by the decreasing air pressure to maintain the high values of the reduced electric field. The spatiotemporal temperature distribution on the surface is captured by an infrared camera, indicating that the heated surface can be divided into three typical regions with different features. Because gas heating is generated in the quenching process of excited molecules, the maximum temperature increase on the surface occurs in the plasma region and attenuates downstream. The surface temperature increase is primarily caused by heat convection from the residual heat in plasma and the heat generated by the dielectric losses. The results of heat flux on the surface suggest that the rising applied voltage may not increase the heat flux in a moderate air pressure ranging from 0.6 to 0.8 bar. Different discharge modes and discharge parameters exhibit markedly different thermal performances. The Schlieren technique and the pressure sensor are used to visualize the induced shock wave, estimate the thermal expansion region, and measure the overpressure strength. The results of the overpressure strength at different air pressures are similar to the thermal features, which highlights the strong influence of the discharge mode on the thermal effect of NSDBD.

show abstract