Rosemann, H. and Birkemeyer, J. and Knauer, A. (2000) Shock Control by Adaptive Elements for Transportation Aircraft Wings. Active Control Technology for Enhanced Performance Operational Capabilities of Military Aircraft, Land Vehicles and Sea Vehicles, Braunschweig, 8-11 May 2000.
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Different devices for the application of shock and boundary layer control on transportation aircraft wings have been investigated on 2-d airfoils and on a swept wing model. A cavity in the surface underneath the foot of the shock covered with a perforated plate reduces shock strength and hence wave drag, but viscous drag increases such that a net drag reduction can not be achieved in most cases. The application of additional boundary layer suction reduces the additional viscous drag, but not enough to result in a significant gain in total drag. On the contrary a contour bump underneath the shock, applied alone or in combination with suction, reduces very effectively wave drag without increasing viscous drag so that under off-design conditions up to 24% total drag reduction has been measured for a 2-d airfoil and somewhat lower values for the swept wing. This effect has been well predicted by numerical methods. Both devices, especially the perforation, have a positive influence on the buffet boundary. Trailing edge devices such as conventional and Gurney-type flaps also effect wave drag by redistributing the pressure on the wing or airfoil. Combining them with a contour bump has been investigated numerically. The results show that by careful optimization of the flap deflection together with the corresponding bump location and height a better performance can be achieved compared to the application of either device alone.
|Document Type:||Conference or Workshop Item (Paper)|
|Title:||Shock Control by Adaptive Elements for Transportation Aircraft Wings|
|Event Title:||Active Control Technology for Enhanced Performance Operational Capabilities of Military Aircraft, Land Vehicles and Sea Vehicles, Braunschweig, 8-11 May 2000|
|HGF - Research field:||Aeronautics, Space and Transport (old)|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||other|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L ST - Starrflüglertechnologien|
|DLR - Research theme (Project):||UNSPECIFIED|
|Location:||Köln-Porz , Braunschweig , Göttingen|
|Institutes and Institutions:||Institute of Aerodynamics and Flow Technology > Institut für Strömungsmechanik|
|Deposited By:||elib DLR-Beauftragter|
|Deposited On:||16 Sep 2005|
|Last Modified:||14 Jan 2010 21:00|
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