Three Flow Features behind the Flow Control Authority of DBD Plasma Actuator: Result of High-Fidelity Simulations and the Related Experiments

Fujii, Kozo

doi:10.3390/app8040546

Cited by 39 publications

(21 citation statements)

References 45 publications

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“…Using the string-type Pa, the suppression of turbine tip clearance flow and feedback control of flow separation on an NACA0015 airfoil have been presented by experiments [28,29]. These cases have verified the performance of the string-type Pa in flow control around a two-dimensional curved surface that has been reported by many researchers [8][9][10][11][12].…”

Section: Tested Model and Flow Conditionsupporting

confidence: 61%

“…From a safety perspective, high voltage AC was applied to the Cu wire, and the exposed electrode was connected to the ground (GND). To date, experimental [3,4,[8][9][10] and numerical [11,12] studies have been conducted and shown the possibilities of improvement in the lift-to-drag ratio and increasing the stall angle using the sheet-type Pa installed near the leading edge of the airfoil as well as the effectiveness of modulation drive. Moreover, control methods of flow fields on more complex shaped 3D bluff bodies have been investigated.…”

Section: Tested Model and Flow Conditionmentioning

confidence: 99%

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Effects of Jet Induced by String-type Plasma Actuator on Flow Around Three-Dimensional Bluff Body and Drag Force

et al. 2020

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An experimental investigation of active flow control on a three-dimensional (3D) curved surface bluff body was conducted by using a string-type plasma actuator. The 3D bluff body model tested in this study was composed of a quarter sphere and a half cylinder, and the Reynolds number based on the diameter of half cylinder was set at 1.3 × 104. The modulation drive was adopted for flow control, and the control effects of variations in dimensionless burst frequency (fm+) normalized by the width of the model and freestream velocity were studied. Velocity distributions analyzed by particle image velocimetry showed that the recirculation region behind the model shrank due to the flow control. The static pressure distributions on the back surface of the model tended to decrease under any fm+ set in this study, especially in the ranges of 0.40 ≤ fm+ ≤ 0.64. The drag coefficient reached its maximum value under the similar ranges of fm+. Although the aerodynamic wake sharpening was observed due to the flow control, the entrainment of separated flow into the back surface of the model was enhanced. This scenario of wake manipulation was considered to be responsible for increasing drag acting on the model.

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Section: Tested Model and Flow Conditionsupporting

confidence: 61%

Section: Tested Model and Flow Conditionmentioning

confidence: 99%

Effects of Jet Induced by String-type Plasma Actuator on Flow Around Three-Dimensional Bluff Body and Drag Force

et al. 2020

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“…With regard to transportation equipment, PA has also been applied to flow around wings, railway pantographs (Mitsumoji et al, 2012), automobile bodies, and others. In particular, many studies focusing on improvement of wing performance by suppressing the flow separation (Sato et al, 2015;Fujii, 2018) have been conducted in the aerospace field. Regarding applications of PA on automobile flow, aerodynamic noise reduction (Miyamoto et al, 2018) and aerodynamic drag reduction (Shadmani et al, 2018;Kanatani et al, 2009;Vernet et al, 2018) have been studied.…”

Section: Aerodynamic Drag Reduction Of a Simplified Vehicle Model By mentioning

confidence: 99%

Aerodynamic drag reduction of a simplified vehicle model by promoting flow separation using plasma actuator

Shimizu

Nakashima

Sekimoto

et al. 2019

Mechanical Engineering Letters

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In recent years, the dielectric barrier discharge plasma actuator (DBD-PA), which is a fluid control device, has been investigated for achieving both high aerodynamic performance and pleasing styling of transportation equipment. In this study, the authors installed a DBD-PA system on a simplified three-dimensional bluff automobile body to reduce the aerodynamic drag. In particular, the authors focused on the sides of the rear end of the body, where the local shape has high sensitivity regarding both styling and aerodynamic drag. At the rear sides of the automobile-like bluff body, a sharp edge rather than a smooth rounded corner often reduces the aerodynamic drag by promoting airflow separation. Therefore, the authors aimed to reduce the aerodynamic drag by using a DBD-PA system to promote flow separation at the rear end while retaining its rounded shape. Aerodynamic measurements using a one-fifth scale simplified automobile model were conducted in a wind tunnel. Preliminary investigation of the aerodynamic effect at the rear clarified how the longitudinal vortices from the rear pillar and the side edge of the trunk deck cause the drag increase at the rear-end corners. Two parallel DBD-PAs were installed on the rear surface to shift these vortices away from the corners by promoting flow separation. The drag reduction rate reached 3% at the highest applied voltage using the DBD-PA system on a rounded shape, and it achieved approximately half the effect of the sharp-edged shape. The longitudinal vortices were successfully kept away from the rear-end corners by the DBD-PAs. The surface pressure increased with the displacement of the vortices, which led to the drag reduction observed.

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“…In reference [12], a DBD plasma actuator, attached near the leading edge of an airfoil and operating in burst mode, is shown to be very effective for controlling flow separation at a Reynolds number of 6.3 × 10 4 , when applied to the flows at an angle of attack higher than the stall. In the paper, guidelines for the effective use of DBD plasma actuators are proposed.…”

Section: Flow Control Applicationsmentioning

confidence: 99%

Special Issue “Active Flow Control Technologies for Energy and Propulsive Systems”

Giorgi

Ficarella

2019

Applied Sciences

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Three Flow Features behind the Flow Control Authority of DBD Plasma Actuator: Result of High-Fidelity Simulations and the Related Experiments

Cited by 39 publications

References 45 publications

Effects of Jet Induced by String-type Plasma Actuator on Flow Around Three-Dimensional Bluff Body and Drag Force

Effects of Jet Induced by String-type Plasma Actuator on Flow Around Three-Dimensional Bluff Body and Drag Force

Aerodynamic drag reduction of a simplified vehicle model by promoting flow separation using plasma actuator

Special Issue “Active Flow Control Technologies for Energy and Propulsive Systems”

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