scholarly journals Flow Separation Control Over a Ramp Using Sweeping Jet Actuators

2014 ◽  
Author(s):  
Mehti Koklu ◽  
Lewis R. Owens
Keyword(s):  
Flow Separation ◽  
Separation Control ◽  
Flow Separation Control ◽  
Jet Actuators

scholarly journals Flow Separation Control on a Full-Scale Vertical Tail Model using Sweeping Jet Actuators

2015 ◽  
Author(s):  
Marlyn Y. Andino ◽  
John C. Lin ◽  
Anthony E. Washburn ◽  
Edward A. Whalen ◽  
Emilio C. Graff ◽  
...  
Keyword(s):  
Flow Separation ◽  
Full Scale ◽  
Separation Control ◽  
Flow Separation Control ◽  
Jet Actuators

Pulsed Air-jet Actuators for Flow Separation Control

2007 ◽  
Vol 78 (3-4) ◽  
pp. 255-281 ◽  
Author(s):  
Clyde Warsop ◽  
Martyn Hucker ◽  
Andrew J. Press ◽  
Paul Dawson
Keyword(s):  
Flow Separation ◽  
Separation Control ◽  
Flow Separation Control ◽  
Air Jet ◽  
Jet Actuators

scholarly journals Fluidic-Oscillator-Based Pulsed Jet Actuators for Flow Separation Control

Fluids ◽  
2021 ◽  
Vol 6 (4) ◽  
pp. 166
Author(s):  
Stephan Löffler ◽  
Carola Ebert ◽  
Julien Weiss
Keyword(s):  
Flow Separation ◽  
Oscillation Frequency ◽  
Current Knowledge ◽  
Industrial Applications ◽  
Synthetic Jets ◽  
Separation Control ◽  
Test Surface ◽  
Flow Separation Control ◽  
Pulsed Jet ◽  
Jet Actuators

The control of flow separation on aerodynamic surfaces remains a fundamental goal for future air transportation. On airplane wings and control surfaces, the effects of flow separation include decreased lift, increased drag, and enhanced flow unsteadiness and noise, all of which are detrimental to flight performance, fuel consumption, and environmental emissions. Many types of actuators have been designed in the past to counter the negative effects of flow separation, from passive vortex generators to active methods like synthetic jets, plasma actuators, or sweeping jets. At the Chair of Aerodynamics at TU Berlin, significant success has been achieved through the use of pulsed jet actuators (PJA) which operate by ejecting a given amount of fluid at a specified frequency through a slit-shape slot on the test surface, thereby increasing entrainment and momentum in a separating boundary layer and thus delaying flow separation. Earlier PJAs were implemented using fast-switching solenoid valves to regulate the jet amplitude and frequency. In recent years, the mechanical valves have been replaced by fluidic oscillators (FO) in an attempt to generate the desired control authority without any moving parts, thus paving the way for future industrial applications. In the present article, we present in-depth flow and design analysis which affect the operation of such FO-based PJAs. We start by reviewing current knowledge on the mechanism of flow separation control with PJAs before embarking on a detailed analysis of single-stage FO-based PJAs. In particular, we show that there is a fundamental regime where the oscillation frequency is mainly driven by the feedback loop length. Additionally, there are higher-order regimes where the oscillation frequency is significantly increased. The parameters that influence the oscillation in the different regimes are discussed and a strategy to incorporate this new knowledge into the design of future actuators is proposed.

scholarly journals Active flow separation control at the outer wing

2019 ◽  
Vol 11 (4) ◽  
pp. 823-836 ◽  
Author(s):  
J. P. Rosenblum ◽  
P. Vrchota ◽  
A. Prachar ◽  
S. H. Peng ◽  
S. Wallin ◽  
...  
Keyword(s):  
Flow Separation ◽  
Separation Control ◽  
Flow Separation Control ◽  
Active Flow
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