Proceedings ArticleDOI
Modification of lifting body aerodynamics using synthetic jet actuators
TLDR
In this paper, the control of separated flow on an unconventional airfoil using synthetic jet actuators was investigated experimentally, and the effect of control location and amplitude was investigated for different angles of attack.Abstract:
The control of separated flow on an unconventional airfoil using synthetic jet actuators was investigated experimentally. A symmetric airfoil based on the aft portion of a NACA four-digit series airfoil with a cylindrical leading edge was used in the experiment. The tests were conducted at Rec=3(10)5. For a>5°, the flow separated from the airfoil surface. Applying synthetic jet control near the leading edge, upstream of the separation point, reattached the separated flow fixangle of attack up to 18°. The effect of control location and amplitude was investigated for different angles of attack. Hot wire measurements in the nearwake of the airfoil revealed a transient passing of vortices associated with the transition from separated to reattached flow on the airfoil.read more
Citations
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Journal ArticleDOI
The control of flow separation by periodic excitation
TL;DR: In this article, a review of the control of flow separation from solid surfaces by periodic excitation is presented, with an emphasis on experimentation relating to hydrodynamic excitation, although acoustic methods as well as traditional boundary layer control, such as steady blowing and suction are discussed in order to provide an appropriate historical context for recent developments.
Journal ArticleDOI
Aerodynamic Flow Control over an Unconventional Airfoil Using Synthetic Jet Actuators
TL;DR: In this article, the effect of the actuation frequency, actuator location, and momentum coefficient on flow separation on a symmetric airfoil with synthetic jet actuators is investigated.
Journal ArticleDOI
Numerical investigation of synthetic-jet flowfields
TL;DR: In this article, the flowflelds surrounding a synthetic-jet actuating device are investigated numerically by direct simulation, and solutions are obtained to the unsteady compressible Navier-Stokes equations for both the interior of the actuator cavity and for the external jet flowfield.
Journal ArticleDOI
Aspects of low- and high-frequency actuation for aerodynamic flow control
TL;DR: In this paper, a Coanda-like deflection of the forced separating shear layer toward the surface is proposed for aerodynamic control of separated flows over aerodynamic (or bluff) bodies in which the separated flow domain scales with the characteristic length of the body.
Journal ArticleDOI
Lumped Element Modeling of Piezoelectric-Driven Synthetic Jet Actuators
TL;DR: In this paper, a lumped element model of a piezoelectric-driven synthetic jet actuator is presented, where the individual components of a synthetic jet are modeled as elements of an equivalent electrical circuit using conjugate power variables.
References
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Journal ArticleDOI
Delay of Airfoil Stall by Periodic Excitation
TL;DR: In this article, it was demonstrated that oscillatory blowing can delay separation from a symmetrical airfoil much more effectively than the steady blowing used traditionally for this purpose than the traditional slow blowing.
Journal ArticleDOI
Perspectives on bluff body aerodynamics
TL;DR: In this paper, the variations of drag and base suction of circular cylinders and bluff plates over the range of Reynolds number from 10 to 10^7 are discussed, with emphasis on the importance of the separated shear layers.
Journal ArticleDOI
Numerical investigation of synthetic-jet flowfields
TL;DR: In this article, the flowflelds surrounding a synthetic-jet actuating device are investigated numerically by direct simulation, and solutions are obtained to the unsteady compressible Navier-Stokes equations for both the interior of the actuator cavity and for the external jet flowfield.