Hallo zusammen,

von Arny Weber habe ich die Einladung von Carlo Lecuit im Namen der "Fédération Aéronautique Luxembourgeoise" zu einem Vortrag von Loek Boermans (TU Delft) am 7. November um 17:30 Uhr in der Universität Luxembourg (Salle Paul Feidert, 6 Rue Richard Coudenhove-Kalergi) erhalten.

Wer hinfährt bitte bei mir wg. Fahrgemeinschaft melden!



On the way to a glide ratio of 1 : 100

Ir. Loek Boermans is Associate Professor at the Low Speed Aerodynamics Laboratory of the Delft University of Technology, Faculty of Aerospace Engineering. He is responsible for the aerodynamic design of several production type highperformance sailplanes and motorplanes. And he is the initiator of the Boundary Layer Suction research at the university and is developing and optimizing the techniques of airfoil design with boundary layer suction.

Loek Boermans played an important role in the development of the Concordia, a glider with a very high aspect ratio and a wide range of wing loadings. In this oneoff glider, construction techniques and aerodynamic knowledge never used before are combined. With a glide ratio of 1:75 the Concordia is the best glider in the world.

Further drag reduction by conventional means is hampered by physical limits. Onorthodox measures are necessary to improve performance. The most promising of such measures is boundary layer suction. With this technique of sucking a small amount of air through a porous wing surface the boundary layer can be kept laminar, which reduces both the pressure drag and friction drag and improves performance spectacularly.

The technique is not new, large scale use of boundary layer suction has stayed away mainly due to lack of a suitable porous material. But due to decreasing fossil fuel stocks and rising fuel prices this method could get a good chance because a lot of fuel can be saved with this method. Loek Boermans will show how a sailplane can be provided with boundary layer suction and what performance would be possible with such a cheap demonstrator of this technology.

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