Design of a Large Scale Vertical Stabilizer Wind Tunnel Model for Active Flow Control Research

2012 ◽  
Author(s):  
Glenn Saunders ◽  
Edward Whalen ◽  
Helen Mooney ◽  
Sarah Zaremski
Keyword(s):  
Wind Tunnel ◽  
Flow Control ◽  
Large Scale ◽  
Active Flow Control ◽  
Scale Model ◽  
Tunnel Model ◽  
Control Research ◽  
Model Geometry ◽  
Design Requirements ◽  
Active Flow

The design, fabrication and installation of an approximately 1/6 scale model of an aircraft vertical stabilizer for research in Active Flow Control (AFC) is discussed. Highlighted are the unique design requirements of wind tunnel models, the specialized fabrication techniques employed to create them and the required close collaboration between industry, government and three academic institutions. The design of the model involves often competing constraints imposed by structural, instrumentation, aerodynamic, manufacturability and research-agenda considerations as well as cost and schedule. Instrumentation requires hundreds of pressure ports and six-axis force/torque sensing. Aerodynamic considerations necessitate high manufacturing precision, highly-skilled fabrication techniques and careful observance of model geometry throughout the design and fabrication processes. A scale model of a vertical stabilizer for AFC research was successfully designed, fabricated and deployed. The collaboratively designed model satisfies the structural, aerodynamic and research design constraints, and furthers the state of the art in Active Flow Control research.

Fluidic actuators for separation control at the engine/wing junction

2017 ◽  
Vol 89 (5) ◽  
pp. 709-718 ◽  
Author(s):  
Philipp Schloesser ◽  
Michael Meyer ◽  
Martin Schueller ◽  
Perez Weigel ◽  
Matthias Bauer
Keyword(s):  
Wind Tunnel ◽  
Flow Control ◽  
Flow Separation ◽  
Mass Flux ◽  
Large Scale ◽  
Active Flow Control ◽  
Wind Tunnel Test ◽  
Local Flow ◽  
Content Type ◽  
Active Flow

Purpose The area behind the engine/wing junction of conventional civil aircraft configurations with underwing-mounted turbofans is susceptible to local flow separation at high angles of attack, which potentially impacts maximum lift performance of the aircraft. This paper aims to present the design, testing and optimization of two distinct systems of fluidic actuation dedicated to reduce separation at the engine/wing junction. Design/methodology/approach Active flow control applied at the unprotected leading edge inboard of the engine pylon has shown considerable potential to alleviate or even eliminate local flow separation, and consequently regain maximum lift performance. Two actuator systems, pulsed jet actuators with and without net mass flux, are tested and optimized with respect to an upcoming large-scale wind tunnel test to assess the effect of active flow control on the flow behavior. The requirements and parameters of the flow control hardware are set by numerical simulations of project partners. Findings The results of ground test show that full modulation of the jets of the non-zero mass flux actuator is achieved. In addition, it could be shown that the required parameters can be satisfied at design mass flow, and that pressure levels are within bounds. Furthermore, a new generation of zero-net mass flux actuators with improved performance is presented and described. This flow control system includes the actuator devices, their integration, as well as the drive and control electronics system that is used to drive groups of actuators. Originality/value The originality is given by the application of the two flow control systems in a scheduled large-scale wind tunnel test.

Impact of the Precessing Vortex Core on NOx Emissions in Premixed Swirl-Stabilized Flames: An Experimental Study

2020 ◽  
Author(s):  
Finn Lückoff ◽  
Moritz Sieber ◽  
Christian Oliver Paschereit ◽  
Kilian Oberleithner
Keyword(s):  
Flow Control ◽  
Large Scale ◽  
Active Flow Control ◽  
Premixed Flame ◽  
Nox Emissions ◽  
Precessing Vortex Core ◽  
Flame Dynamics ◽  
Swirl Flows ◽  
Active Flow ◽  
The Impact

Abstract The reduction of polluting NOx emission remains a driving factor in the design process of swirl-stabilized combustion systems, to meet strict legislative restrictions. In reacting swirl flows, hydrodynamic coherent structures, such as periodic large-scale vortices in the shear layer, induce zones with increased heat release rate fluctuations in connection with temperature peaks, which lead to an increase of NOx emissions. Such large-scale vortices can be induced by the helical coherent structure known as precessing vortex core (PVC), which influences the flow and flame dynamics of reacting swirl flows under certain operating conditions. We developed an active flow control system, which allows for a targeted actuation of the PVC, to investigate its impact on important combustion properties. In this study, the direct active flow control is used to actuate a PVC of arbitrary frequency and amplitude, which facilitates a systematic study of the impact of the PVC on NOx emissions. In the course of the present work, a perfectly premixed flame, which slightly damps the PVC, is studied in detail. Since the PVC is slightly damped, it can be precisely excited by means of open-loop flow control. In connection with time-resolved OH*-chemiluminescence and stereoscopic PIV measurements, the flame and flow response to PVC actuation as well as the impact of the actuated PVC on flow and flame dynamics are characterized. It turns out that the PVC rolls up the inner shear layer, which results in an interaction of PVC-induced vortices and flame. This interaction considerably influences the measured level of NOx emissions, which grow with increasing PVC amplitude in a perfectly premixed flame. Nearly the same increase is to be seen for a partially premixed flame. This in contrast to previous studies, where the PVC is assumed to reduce the NOx emissions due to vortex-enhanced mixing.

scholarly journals Performance Optimization of Wind Turbine Rotors with Active Flow Control (Part 2)

2012 ◽  
Vol 134 (08) ◽  
pp. 55-55 ◽  
Author(s):  
G. Pechlivanoglou ◽  
C.N. Nayeri ◽  
C.O. Paschereit
Keyword(s):  
Flow Control ◽  
Wind Turbine ◽  
Performance Optimization ◽  
System Integration ◽  
Large Scale ◽  
Active Flow Control ◽  
Lightning Strike ◽  
Scale Production ◽  
Turbine Rotors ◽  
Active Flow

This article discusses the performance optimization of wind turbine rotors with active flow control. An extensive multi-parameter investigation with a thorough matrix-grading system was performed to identify the most suitable solution for industrial quality, short/mid-term implementation on actual utility scale wind turbines. A very wide selection of aerodynamic flow control solutions was analyzed based on extensive multi-disciplinary literature review and through aerodynamic and aeroelastic simulations. It is suggested that the trailing edge devices have the most favorable performance in the field of system integration and mechanical design performance. Compliant structures like the flexible flap keep the number of moving parts to a minimum while maintaining high performance and manufacturing simplicity. The use of flexible and elastic materials based on polymers or rubber material improves the lightning strike resistance of these solutions and allows for low-cost large-scale production. The actuator principle, sensitivity, and reliability are decisive parameters, and pneumatic actuators seem to strike a good balance between performance, cost, and reliability.

Wind Tunnel Testing of High Efficiency Low Power (HELP) Actuation for Active Flow Control

2020 ◽  
Author(s):  
John C. Lin ◽  
LaTunia G. Pack Melton ◽  
Judith Hannon ◽  
Marlyn Y. Andino ◽  
Mehti Koklu ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
Low Power ◽  
Flow Control ◽  
High Efficiency ◽  
Active Flow Control ◽  
Wind Tunnel Testing ◽  
Active Flow ◽  
Tunnel Testing

A facility for active flow control research in serpentine inlets

2002 ◽  
Author(s):  
A. Rabe ◽  
S. Olcmen ◽  
J. Anderson ◽  
R. Burdisso ◽  
W. Ng
Keyword(s):  
Flow Control ◽  
Active Flow Control ◽  
Control Research ◽  
Active Flow

Wind Tunnel Experiments with Active Flow Control for an Outer Wing Model

2015 ◽  
Author(s):  
Vlad Ciobaca ◽  
Jochen Wild ◽  
Matthias Bauer ◽  
Thomas Grund ◽  
Claus-Philipp Huehne ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
Flow Control ◽  
Active Flow Control ◽  
Wind Tunnel Experiments ◽  
Wing Model ◽  
Active Flow

On the Application of Intelligent Systems to Active Flow Control

2004 ◽  
Author(s):  
Feng Lin ◽  
Marco P. Schoen ◽  
Lucheng Ji
Keyword(s):  
Flow Control ◽  
Intelligent Systems ◽  
Active Flow Control ◽  
Recent Decade ◽  
Marine Vehicles ◽  
Auxiliary Power ◽  
New Development ◽  
Control Research ◽  
Intelligent Tools ◽  
Active Flow

In the recent decade, a great deal of research has been devoted to active control of the unsteady flow in a wide variety of components and/or subsystems of aircraft, automobile and marine vehicles and industrial fluid machinery, because small improvements in component and/or subsystem performance often lead to large payoffs. The term active flow control is used to describe the methods to actively manipulate flow fields with auxiliary power introduced to the flow. In this paper, a brief survey of the recent progress in active flow control research is made. The possibilities of further performance improvement using the theories and technologies of intelligent systems are discussed. Intelligent systems can be applied to improve sensing and actuating, increase model accuracy, and optimize the control schemes. The active flow control systems, on the other hand, may also challenge intelligent systems researchers and stimulate new development of intelligent tools.

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