Characterization of plasma synthetic jet actuator with Laval-shaped exit and application to drag reduction in supersonic flow

Abstract A compact, lightweight, low-power piezoelectric micro-blower was characterized using particle image velocimetry to determine its flow control potential. The micro-blower has been operated in continuous mode as well as in burst mode using two different actuation frequencies. The maximum mean velocity measured with the micro-blower operating in continuous mode was approximately Ūmax = 13 m/s which occurred at the centerline at an approximate stream-wise location of x/d = 4. The velocity profiles in the developed region resemble those of turbulent jets. The momentum-flux from the micro-blower in continuous mode was significantly greater than a typical synthetic jet actuator which was successfully used for flow control, indicating that the micro-blower can impart the necessary momentum to be effective for flow control. With burst mode, the results show that the micro-blower could impart an even greater momentum.

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Phase Locked Analysis of a Simplified Car Geometry Wake Flow Control Using Synthetic Jet

Volume 2: Fora ◽

10.1115/fedsm2006-98469 ◽

2006 ◽

Cited By ~ 4

Author(s):

Ce´dric Leclerc ◽

Euge´nie Levallois ◽

Quentin Gallas ◽

Patrick Gillie´ron ◽

Azeddine Kourta

Keyword(s):

Boundary Layer ◽

Turbulent Boundary Layer ◽

Drag Reduction ◽

Vortex Shedding ◽

Aerodynamic Drag ◽

Streamwise Velocity ◽

Local Effect ◽

Synthetic Jet ◽

Wake Flow ◽

Synthetic Jet Actuator

This paper presents a numerical unsteady analysis of a SJA impact on a car wake flow. First, for the optimal reduced frequency F+, the influence of the Cμ on the mean aerodynamic drag reduction 〈Cd〉 is observed. A spectral analysis of the vortex shedding coming from the upper and the lower part of the car and of the drag coefficient is then presented for different Cμ values. Preliminary results suggest that maximum drag reduction is obtained when most energy in the wake comes from the actuator forcing frequency rather than the natural vortex shedding frequencies of the two contributions. This work is completed by a phase locked analysis of the synthetic jet actuator local effect on the turbulent boundary layer just before the flow separation. For the fixed optimal F+, different Cμ values are compared. The streamwise velocity profiles seem to show that maximal efficiency of the control is obtained when the synthetic jet injected momentum is introduced in the logarithmic sub-layer part of the turbulent boundary layer.

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Performance Characterization of a Piezoelectric Micro SJA

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.74.223 ◽

2009 ◽

Vol 74 ◽

pp. 223-226

Author(s):

An Shik Yang ◽

Jeng Jong Ro ◽

Wei Han Chang

Keyword(s):

Near Field ◽

Vortex Pair ◽

Computer Code ◽

Synthetic Jet ◽

Driving Voltage ◽

Synthetic Jet Actuator ◽

Air Jet ◽

Jet Actuators ◽

Jet Behavior

This paper aims to explore the synthetic jet behavior for a dual-diaphragm piezoelectrically driven micro synthetic jet actuator. For a sinusoidal actuation cycle at an operating frequency of 648 Hz, the synthetic jet flow pattern was simulated and compared with the visualized image and measured centerline velocity distribution to validate the computer code. The far-field flow structure was similar to a common continuous turbulent air jet; whereas, the unsteady formation of a vortex pair was predicted in the near-field. Numerical experiments were extended to appraise performance of micro synthetic jet actuators by varying the driving voltage, width of the slot and depth of the actuator cavity.

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PIV and Electric Characterization of a Plasma Synthetic Jet Actuator

45th AIAA Fluid Dynamics Conference ◽

10.2514/6.2015-2465 ◽

2015 ◽

Cited By ~ 6

Author(s):

Francois Laurendeau ◽

Francois Chedevergne ◽

Olivier Léon

Keyword(s):

Synthetic Jet ◽

Synthetic Jet Actuator

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Characterization of a Commercial Synthetic Jet Actuator for Air Quality Applications

Journal of Fluids Engineering ◽

10.1115/1.4035948 ◽

2017 ◽

Vol 139 (7) ◽

Cited By ~ 3

Author(s):

Miles Abarr ◽

Denise Mauney ◽

Jean Hertzberg ◽

Lupita D. Montoya

Keyword(s):

Air Quality ◽

Indoor Air Quality ◽

Indoor Air ◽

Dynamic Pressure ◽

Power Input ◽

Synthetic Jet ◽

Small Power ◽

Synthetic Jet Actuator ◽

Sphere Of Influence

In this study, a commercial electromagnetic synthetic jet actuator (SJA) was characterized to determine its flow patterns and sphere of influence within a room. Its axisymmetry was also evaluated. The objective of this research is to explore the potential application of this commercial SJA for indoor air quality (IAQ) control and its limitations for such application. A small fan of similar size was also partially characterized. Results showed that the SJA is axisymmetric, and it uses a small power input to impact the airflow over 1 m from the jet exit. Further, while the SJA showed less flow output than the fan in this study, it had significantly greater dynamic pressure per unit power. This feature could be potentially useful for indoor air quality control applications.

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