Unsteady Active Flow Control on the Leading Edge of a High-lift Configuration Thin Airfoil

2016 ◽  
Author(s):  
Lucas Clemons ◽  
Richard W. Wlezien
Keyword(s):  
Flow Control ◽  
Active Flow Control ◽  
Leading Edge ◽  
High Lift ◽  
Thin Airfoil ◽  
Active Flow

Comparison of Two Active Flow Control Mechanisms of Pure Blowing and Pure Suction on a Pitching NACA0012 Airfoil at Reynolds Number of 1 × 106

2018 ◽  
Author(s):  
Ehsan Asgari ◽  
Mehran Tadjfar
Keyword(s):  
Reynolds Number ◽  
Flow Control ◽  
Active Flow Control ◽  
Hysteresis Loops ◽  
Leading Edge ◽  
Control Mechanisms ◽  
Airfoil Surface ◽  
Naca0012 Airfoil ◽  
Maximum Angle ◽  
Active Flow

In this study, we have applied and compared two active flow control (AFC) mechanisms on a pitching NACA0012 airfoil at Reynolds number of 1 × 106 using 2-D computational fluid dynamics (CFD). These mechanisms are continuous blowing and suction which are applied separately on the airfoil which pitches around its quarter-chord in a sinusoidal motion. The location for suction and blowing was determined in our previous study based on the formation of a counter clock-wise vortex near the leading-edge. In our current study, we have compared the effectiveness of pure blowing and pure suction in suppressing the dynamic stall vortex (DSV) which is the main contributor to the drag increase, particularly near the maximum angle of attack (AOA) and in early downstroke motion. The blowing/suction slot is considered as a dent on the airfoil surface which enables the AFC to perform in a tangential manner. This configuration would allow blowing jet to penetrate further downstream and was shown to be more effective compared to a cross-flow orientation. We have compared the two aforementioned mechanisms in terms of hysteresis loops of lift and drag coefficients and have demonstrated the dynamics of flow in controlled and uncontrolled situations.

scholarly journals Active Flow Control of a High-Lift Supercritical Airfoil with Microjet Actuators

AIAA Journal ◽  
2020 ◽  
Vol 58 (5) ◽  
pp. 2053-2069
Author(s):  
Kade Stephen Aley ◽  
Tufan Kumar Guha ◽  
Rajan Kumar
Keyword(s):  
Flow Control ◽  
Active Flow Control ◽  
High Lift ◽  
Supercritical Airfoil ◽  
Active Flow ◽  
Microjet Actuators

Organization of Cylinder Wake Using a Splitter-Plate Active Flow Control

2010 ◽  
Author(s):  
Chris Weiland ◽  
Pavlos Vlachos
Keyword(s):  
Circular Cylinder ◽  
Flow Control ◽  
Strouhal Number ◽  
Active Flow Control ◽  
Leading Edge ◽  
Splitter Plate ◽  
Cylinder Wake ◽  
Time Resolved ◽  
Image Velocimetry ◽  
Active Flow

Time Resolved Digital Particle Image Velocimetry (TRDPIV) was used in conjunction with spectral analysis to study the effects of Leading Edge Blowing (LEB) flow control on the near-wake of a circular cylinder. The airfoil was placed 1.9 circular cylinder diameters downstream, effectively acting as a splitter plate. Spectral measurements of the TRDPIV results indicated that the presence of the airfoil decreased the Strouhal number from 0.19 to 0.12 as anticipated. When activated the LEB jet organized the circular cylinder wake, effectively neutralizing the effect of the splitter plate and modifying the wake so as to return the Strouhal number to 0.19. Thus the circular cylinder wake returned to its normal shedding frequency, even in the presence of the airfoil. Evidence presented in this study supports the notion that the LEB jet directly excites the circular cylinder shear layers causing instability, roll up, and subsequent vortex shedding.

Numerical Investigation of an Elastomer-Piezo-Adaptive Blade for Active Flow Control of a Nonsteady Flow Field Using Fluid–Structure Interaction Simulations

2017 ◽  
Vol 139 (9) ◽  
Author(s):  
Tien Dat Phan ◽  
Patrick Springer ◽  
Robert Liebich
Keyword(s):  
Flow Control ◽  
Active Flow Control ◽  
Leading Edge ◽  
Material Behavior ◽  
Fluid Structure ◽  
Numerical Investigations ◽  
Pulsed Detonation ◽  
Stator Blade ◽  
Suitable Concept ◽  
Active Flow

In order to prevent critical effects due to pulsed detonation propulsion, e.g., incidence fluctuations, an elastomer-piezo-adaptive stator blade with a deformable front part is developed. Numerical investigations with respect to the interaction of fluid and structure including the piezoelectric properties and the hyperelastic material behavior of an elastomer membrane are conducted in order to investigate the concept of the elastomer-piezo-adaptive blade for developing the best suitable concept for subsequent experiments with a stator cascade in a wind tunnel. Results of numerical investigations of the structure-dynamic and fluid mechanical behavior of the elastomer-piezo-adaptive blade by using a novel fluid–structure-piezoelectric-elastomer-interaction simulation (FSPEI simulation) show that the latent danger of a laminar flow separation at the leading edge at incidence fluctuations can be prevented by using an adaptive blade. Therefore, the potential of the concept of the elastomer-piezo-adaptive blade for active flow control is verified. Furthermore, it is essential to consider the interactions between fluid and structure of the transient FSPEI simulations, since not only the deformation of the adaptive blade affects the flow around the blade, the flow has a significant effect on the dynamic behavior of the adaptive blade, as well.

System-Level Assessment of Active Flow Control for Commercial Aircraft High-Lift Devices

2017 ◽  
Author(s):  
Yu Cai ◽  
Zhenyu Gao ◽  
Imon Chakraborty ◽  
Simon I. Briceno ◽  
Dimitri N. Mavris
Keyword(s):  
Flow Control ◽  
Active Flow Control ◽  
System Level ◽  
Commercial Aircraft ◽  
High Lift ◽  
Active Flow

scholarly journals Testing of High-Lift Common Research Model with Integrated Active Flow Control

2020 ◽  
Vol 57 (6) ◽  
pp. 1121-1133
Author(s):  
John C. Lin ◽  
Latunia P. Melton ◽  
Judith A. Hannon ◽  
Marlyn Y. Andino ◽  
Mehti Koklu ◽  
...  
Keyword(s):  
Flow Control ◽  
Active Flow Control ◽  
Research Model ◽  
High Lift ◽  
Active Flow

Design of a high-lift experiment in water including active flow control

2014 ◽  
Vol 23 (7) ◽  
pp. 077004 ◽  
Author(s):  
T Beutel ◽  
S Sattler ◽  
Y El Sayed ◽  
M Schwerter ◽  
M Zander ◽  
...  
Keyword(s):  
Flow Control ◽  
Active Flow Control ◽  
High Lift ◽  
Active Flow
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