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Experimental and CFD Characterization of a Double-Orifice Synthetic Jet Actuator for Flow Control
 
 
Article

Combined Passive/Active Flow Control of Drag and Lift Forces on a Cylinder in Crossflow Using a Synthetic Jet Actuator and Porous Coatings

Department of Mechanical, Manufacturing & Biomedical Engineering, Trinity College Dublin, The University of Dublin, D02 PN40 Dublin, Ireland
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Author to whom correspondence should be addressed.
Academic Editor: Luigi de Luca
Actuators 2022, 11(7), 201; https://doi.org/10.3390/act11070201
Received: 14 June 2022 / Revised: 15 July 2022 / Accepted: 17 July 2022 / Published: 19 July 2022
(This article belongs to the Special Issue Flow Control by Means of Synthetic Jet Actuators)
This paper combines a synthetic jet actuator (SJA) and a leeward porous coating to alter the aerodynamic forces on a cylinder in crossflow at Re = 4.2 × 104. While SJAs and porous coatings are known to be effective flow control methods in isolation, their combined effect has not been studied. A 2D numerical model was created of a cylinder with a SJA at 90° and 100° leeward porous coating. The model was validated using accompanying water tunnel tests. The combined model was tested for dimensionless frequencies 0.15 <f+< 4 and compared to reference models. For f+< 1, using only the SJA increases the cylinder drag coefficient (Cd). Combining a porous coating with the SJA in that regime lowers the Cd values by 15–21%, and causes an overall reduction in Cd compared to the smooth cylinder baseline case. However, using only the porous coating causes a superior 35% reduction in Cd. For f+> 1, the combined SJA and porous coating configuration did not differ from the SJA only configuration, achieving the largest drag reduction of 45% at f+ = 4. The flow control mechanisms of the SJA and porous coating do not combine constructively in this current setup. However, the porous coating is beneficial for f+< 1, causing an overall drag reduction even when the active SJA tends to increase drag. View Full-Text
Keywords: drag reduction; oscillating lift; porous media flow; vortex shedding; synthetic jet; experimental fluid dynamics; water tunnel; computational fluid dynamics; URANS; k-ω SST drag reduction; oscillating lift; porous media flow; vortex shedding; synthetic jet; experimental fluid dynamics; water tunnel; computational fluid dynamics; URANS; k-ω SST
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MDPI and ACS Style

Farrell, G.; Gibbons, M.; Persoons, T. Combined Passive/Active Flow Control of Drag and Lift Forces on a Cylinder in Crossflow Using a Synthetic Jet Actuator and Porous Coatings. Actuators 2022, 11, 201. https://doi.org/10.3390/act11070201

AMA Style

Farrell G, Gibbons M, Persoons T. Combined Passive/Active Flow Control of Drag and Lift Forces on a Cylinder in Crossflow Using a Synthetic Jet Actuator and Porous Coatings. Actuators. 2022; 11(7):201. https://doi.org/10.3390/act11070201

Chicago/Turabian Style

Farrell, Gearóid, Michael Gibbons, and Tim Persoons. 2022. "Combined Passive/Active Flow Control of Drag and Lift Forces on a Cylinder in Crossflow Using a Synthetic Jet Actuator and Porous Coatings" Actuators 11, no. 7: 201. https://doi.org/10.3390/act11070201

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