Maximization of the lift coefficient of airfoils equipped with active flow control devices

2009 ◽  
Vol 52 (3) ◽  
pp. 302-309
Author(s):  
R. A. Gaifutdinov
Keyword(s):  
Flow Control ◽  
Active Flow Control ◽  
Lift Coefficient ◽  
Flow Control Devices ◽  
Control Devices ◽  
Active Flow

Experimental Assessment of Fatigue Load Control for Wind Turbines employing Active Flow Control Devices

2022 ◽  
Author(s):  
Sirko Bartholomay ◽  
Sascha Krumbein ◽  
Victoria Deichmann ◽  
Maik Gentsch ◽  
Sebastian Perez-Becker ◽  
...  
Keyword(s):  
Flow Control ◽  
Wind Turbines ◽  
Active Flow Control ◽  
Load Control ◽  
Fatigue Load ◽  
Experimental Assessment ◽  
Flow Control Devices ◽  
Control Devices ◽  
Active Flow

The design and manufacturing of fluidic oscillators for composite aircraft structures

2018 ◽  
Vol 233 (4) ◽  
pp. 1250-1259
Author(s):  
Ahmed Aly ◽  
Jonathan Colton
Keyword(s):  
Flow Control ◽  
Large Volume ◽  
Composite Structures ◽  
Active Flow Control ◽  
Scale Production ◽  
Fluidic Oscillator ◽  
Flow Control Devices ◽  
Final Design ◽  
Control Devices ◽  
Active Flow

Active flow control devices have been proven to reduce drag and delay stall on commercial aircraft. This leads to lower fuel usage and thus reduced flight costs. However, there is a large uncertainty as to how to integrate active flow control devices into aircraft, specifically those with composite structures. In addition, the cost of manufacturing active flow control devices for large-scale production has not been previously studied. In this article, design concepts for the attachment of a fluidic oscillator to a composite aircraft structure are investigated. A systematic approach from the conceptual design to the final design is performed using different design tools. A cost analysis is performed to select the most cost-effective design configuration based on large volume fluidic oscillator production. Through design validation and cost estimation, the final design is shown to be feasible for large volume manufacturing.

CFD simulations of active flow control devices applied on a cambered flap

2022 ◽  
Author(s):  
Abderahmane Marouf ◽  
Dinh Hung Truong ◽  
Yannick Hoarau ◽  
Alain Gehri ◽  
Dominique Charbonnier ◽  
...  
Keyword(s):  
Flow Control ◽  
Active Flow Control ◽  
Cfd Simulations ◽  
Flow Control Devices ◽  
Control Devices ◽  
Active Flow

The Development of Active Flow Control Devices From Shape Memory Alloys for the Convective Cooling of Heated Surfaces

2008 ◽  
Author(s):  
Mohd S. Aris ◽  
Ieuan Owen ◽  
Chris J. Sutcliffe
Keyword(s):  
Heat Transfer ◽  
Flow Control ◽  
Heated Surface ◽  
Active Flow Control ◽  
Control Device ◽  
Flow Control Devices ◽  
Flow Control Device ◽  
Control Devices ◽  
Channel Configuration ◽  
Active Flow

This paper is concerned with the convective heat transfer of heated surfaces through the use of active flow control devices. An investigation has been carried out into the use of two flow control design configurations manufactured from Shape Memory Alloys (SMAs) which are activated at specified temperatures. In this design, a high surface temperature would activate rectangular flaps to change shape and protrude at a 45° angle of attack. This protrusion would generate longitudinal vortices and at the same time allow air to flow into cooling channels underneath the flaps, cooling a heated surface downstream of the flow control device. One- and two-channel flow control configurations were explored in this work. The flow control device was made from pre-alloyed powders of SMA material in a rapid prototyping process known as Selective Laser Melting (SLM). It was tested for its heat transfer enhancement in an open test section wind tunnel supplied with low velocity air flow. Infrared thermography was used to evaluate the surface temperatures of the downstream heated surface. Promising results were obtained for the flow control design when the heated surface temperatures were varied from 20 °C to 85 °C. In the one-channel configuration, the flow control device in its activated shape increased heat transfer to a maximum of 50% compared to its deactivated shape. The activated flow control device in the two-channel configuration experienced a heat transfer enhancement of up to 90% compared to when it is deactivated.

scholarly journals Numerical study on the steady suction active flow control of hydrofoil in the profile of the blended-wing-body underwater glider

2021 ◽  
Vol 39 (4) ◽  
pp. 801-809
Author(s):  
Xiaoxu Du ◽  
Lianying Zhang
Keyword(s):  
Flow Control ◽  
Numerical Study ◽  
Active Flow Control ◽  
Lift Coefficient ◽  
Leading Edge ◽  
Hydrodynamic Performance ◽  
Flow State ◽  
Underwater Glider ◽  
Blended Wing Body ◽  
Active Flow

The hydrodynamic performance of the blended-wing-body underwater glider can be improved by opening a hole on the surface and applying the steady suction active flow control. In order to explore the influence law and mechanism of the steady suction active flow control on the lift and drag performance of the hydrofoil, which is the profile of the blended-wing-body underwater glider, based on the computational fluid dynamics (CFD) method and SST k-ω turbulence model, the steady suction active flow control of hydrofoil under different conditions is studied, which include three suction factors: suction angle, suction position and suction ratio, as well as three different flow states: no stall, critical stall and over stall. Then the influence mechanism in over stall flow state is further analyzed. The results show that the flow separation state of NACA0015 hydrofoil can be effectively restrained and the flow field distribution around it can be improved by a reasonable steady suction, so as to the lift-drag performance of NACA0015 hydrofoil is improved. The effect of increasing lift and reducing drag of steady suction is best at 90° suction angle and symmetrical about 90° suction angle, and it is better when the steady suction position is closer to the leading edge of the hydrofoil. In addition, with the increase of the suction ratio, the influence of steady suction on the lift coefficient and drag coefficient of hydrofoil is greater.

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