Automatic Transition Prediction and Application to Three-Dimensional High-Lift Configurations

2007 ◽  
Vol 44 (3) ◽  
pp. 918-926 ◽  
Author(s):  
Andreas Krumbein
Keyword(s):  
Three Dimensional ◽  
High Lift ◽  
Transition Prediction

Transition Prediction and Impact on a Three-Dimensional High-Lift-Wing Configuration

2008 ◽  
Vol 45 (5) ◽  
pp. 1751-1766 ◽  
Author(s):  
Frédéric Moens ◽  
Jean Perraud ◽  
Andreas Krumbein ◽  
Thomas Toulorge ◽  
Pierluigi Iannelli ◽  
...  
Keyword(s):  
Three Dimensional ◽  
High Lift ◽  
Transition Prediction

Transport Aircraft Three-Dimensional High-Lift Wing Numerical Transition Prediction

2008 ◽  
Vol 45 (5) ◽  
pp. 1554-1563 ◽  
Author(s):  
J. Perraud ◽  
J. Cliquet ◽  
R. Houdeville ◽  
D. Arnal ◽  
F. Moens
Keyword(s):  
Three Dimensional ◽  
High Lift ◽  
Transport Aircraft ◽  
Transition Prediction

Transition Prediction on the Slat of a High-Lift System

2004 ◽  
Vol 41 (6) ◽  
pp. 1384-1392 ◽  
Author(s):  
M. R. Malik ◽  
R.-S. Lin
Keyword(s):  
High Lift ◽  
Transition Prediction

scholarly journals Aeroelastic behaviour of a wing with over-the-wing mounted UHBR engine

2020 ◽  
Vol 11 (4) ◽  
pp. 1045-1055 ◽  
Author(s):  
N. Neuert ◽  
D. Dinkler
Keyword(s):  
Three Dimensional ◽  
High Lift ◽  
Reduced Order ◽  
Aerodynamic Loads ◽  
Flow Simulations ◽  
Dimensional Effects ◽  
Line Theory ◽  
Lifting Line ◽  
Bypass Ratio ◽  
Lifting Line Theory

Abstract The aeroelastic behaviour of a wing with an over-the-wing pylon-mounted ultra-high bypass ratio engine and high-lift devices is studied with a reduced-order model. Wing, pylon and engine structures are reduced separately using the modal approach and described by their natural frequencies and modes. The characteristic aerodynamic loads are investigated with steady and unsteady flow simulations of a two-dimensional profile section. These results indicate possible heave instabilities at strongly negative angles of attack. Three-dimensional effects are taken into account using an adapted lifting line theory according to Prandtl. Due to high circulations resulting from the high-lift systems, the effective angles of attack are in the range of the potential instabilities. The substructures and aerodynamic loads are coupled in modal space. For the wing without three-dimensional effects, the bending instability occurs at the corresponding negative angles of attack. Even though there is potential for improvement, including the three-dimensional effects shifts the endagered area to possible operation points.

Control of Separated Boundary-Layer on Subsonic Airfoil Using Vortex Generator Jet Devices

2006 ◽  
Author(s):  
A. Kourta ◽  
G. Petit ◽  
J. C. Courty ◽  
J. P. Rosenblum
Keyword(s):  
Boundary Layer ◽  
Friction Coefficient ◽  
Skin Friction ◽  
Three Dimensional ◽  
Vortex Generator ◽  
Leading Edge ◽  
Skin Friction Coefficient ◽  
Synthetic Jets ◽  
High Lift ◽  
Longitudinal Vortices

The control of subsonic high lift induced separation on airfoil may improve the flight envelope of current aircraft or even simplify the complex and heavy high-lift devices on commercial airframes. Until now, synthetic jets have proved a really interesting efficiency to delay or remove even leading-edge located separated areas on high-lift configuration but are not efficient for real scale aircrafts. In case of pressure-like separation (i.e. from trailing-edge), synthetic jets can be replaced by so the called “Vortex Generator Jets” which create strong longitudinal vortices that increase mixing in inner boundary layer and consequently the skin friction coefficient is increased to prevent separation. In this study, numerical simulations were undertaken on a generic three dimensional flat plate in order to quantify the effect of the longitudinal vortices on the natural skin friction coefficient. Both counter and co-rotative devices were tested at different exhaust velocities and distances between each others. Finally co-rotative vortex generators jets were tested on a three dimensional generic airfoil ONERA D. Results show a delay of the separation occurence but this solution does not seem to be as robust as synthetic jets. The study of jets spacing with respect to the efficiency of the devices shows a maximum for a given ratio of spacing to exhaust velocity.

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