Modelling and design of wing tip devices at various flight conditions using a databased aerodynamic prediction tool |
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Authors: | Alexander Büscher Rolf Radespiel Thomas Streit |
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Institution: | aTU Braunschweig, Institut für Strömungsmechanik, Bienroder Weg 3, 38106 Braunschweig, Germany;bDLR, Institut für Aerodynamik und Strömungstechnik, Lilienthalplatz 7, 38108 Braunschweig, Germany |
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Abstract: | A design study of wing tip devices at high and low speeds is described. The basis of the design study is an equivalent drag approach containing both aerodynamic drag gain and structural weight penalty. A comprehensive parameter study is carried out using a rapid aerodynamic prediction tool named Lift and Drag Component Analysis (LIDCA). Adding to an available lifting-line method a databased module for airfoil data is employed that uses results of two-dimensional flow simulations by multidimensional interpolation. Detailed validation studies of the method at high lift and high speed have demonstrated good accuracy. RANS computations of the selected wing tip designs confirm the predicted benefits at cruise condition. The results of the most effective wing tip designs are analysed at both flight conditions. Finally, options for improving the performance at take-off are suggested. |
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Keywords: | Winglet M-DAW Nonplanar wing Induced drag Drag due to liftSchlü sselwö rter: Winglet M-DAW Nichtplanarer Tragflü gel Induzierter Widerstand |
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