Journal ArticleDOI
Unsteady Plasma Actuators for Separation Control of Low-Pressure Turbine Blades
TLDR
In this paper, the authors used single dielectric barrier plasma actuators for flow separation on turbine blades in the low-pressure turbine stage at low Reynolds numbers typical of high-altitude cruise.Abstract:
This is a continuation of our work on the use of single dielectric barrier plasma actuators for controlling flow separation on turbine blades in the low-pressure turbine stage at low Reynolds numbers typical of high-altitude cruise. This used a linear cascade of Pratt & Whitney "PakB" shaped blades to provide generic low-pressure turbine conditions. The flow over one of the blades was documented through surface pressure, laser-Doppler velocimetry, and hot-wire measurements. These were used to define the location and size of the separated flow region on the suction side of the blade. Both steady and unsteady plasma actuators were implemented and found to be effective in separation control. For the unsteady actuators, there was an optimum excitation frequency to reattach the flow that corresponded to a Strouhal number, based on the length of the separated zone and the local freestream velocity, equal to unity. The unsteady actuator was more effective than the steady actuator in reattaching the flow while also requiring less power. It was suggested by the experimental results that the mechanism for the steady actuators was turbulence tripping, whereas the mechanism for the unsteady actuators was to generate a train of spanwise structures that promoted mixing.read more
Citations
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Journal ArticleDOI
Dielectric Barrier Discharge Plasma Actuators for Flow Control
TL;DR: A particular type of plasma actuator that has gained wide use is based on a single-dielectric barrier discharge (SDBD) mechanism that has desirable features for use in air at atmospheric pressures as mentioned in this paper.
Journal ArticleDOI
Optimization of Dielectric Barrier Discharge Plasma Actuators for Active Aerodynamic Flow Control
TL;DR: In this paper, the authors present the results of a parametric experimental investigation aimed at optimizing the body force produced by single dielectric barrier discharge plasma actuators used for aerodynamic flow control.
Journal ArticleDOI
SDBD plasma enhanced aerodynamics: concepts, optimization and applications
TL;DR: In this paper, the authors provide an overview of the physics and design of single dielectric barrier discharge (SDBD) plasma actuators for enhanced aerodynamics in a variety of applications.
Journal ArticleDOI
Single dielectric barrier discharge plasma enhanced aerodynamics: physics, modeling and applications
TL;DR: A particular type of plasma actuator that has gained wide use is based on a single dielectric barrier discharge (SDBD) mechanism that has desirable features for use in air at atmospheric pressures as mentioned in this paper.
Journal ArticleDOI
Plasma Actuators for Cylinder Flow Control and Noise Reduction
TL;DR: In this article, the results of flow-control experiments using single dielectric barrier discharge plasma actuators to control flow separation and unsteady vortex shedding from a circular cylinder in crossflow are reported.
References
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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
Separation Control on HIgh Angle of Attack Airfoil Using Plasma Actuators
Martiqua Post,Thomas Corke +1 more
TL;DR: In this article, a generic airfoil shape (NACA 663-018) was used because of its documented leading-edge stall characteristics, and it was instrumented for surface pressure measurements that were used to calculate lift coefficients.
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
Mechanisms and Responses of a Single Dielectric Barrier Plasma Actuator: Plasma Morphology
TL;DR: In this paper, simultaneous optical, electrical, and thrust measurements of an aerodynamic plasma actuator are presented, which reveal the temporal and macro-scale spatial structure of the plasma and the electrical characteristics of the discharge to the actuator performance as measured by the thrust produced.
Journal ArticleDOI
Oscillatory Blowing: A Tool to Delay Boundary-Layer Separation
TL;DR: In this article, the effects of oscillatory blowing as a means of delaying separation are discussed, and experiments were carried out on a follow, flapped NACA 01115 airfoil equipped with a two-dimensional slot over the hinge of the flap.
Related Papers (5)
Plasma Actuators for Separation Control of Low-Pressure Turbine Blades
Separation Control on HIgh Angle of Attack Airfoil Using Plasma Actuators
Martiqua Post,Thomas Corke +1 more