In this paper, the design and the realization of an integrated system able to control the normal shock wave is presented. This device is constituted by a skin element whose geometry may vary statically and dynamically, according to the aerodynamic conditions. The static working consists in displacements aimed at reaching the desired aerodynamic shape, whereas, the dynamic working consists in vibrations around the steady configuration with a frequency range between 10 and 140 Hz. Three different working modalities of the device are discussed: in the first modality, a pressure load assures the static working and tangential piezoactuators bonded on the inner surface of the skin element provide the vibrations; in the second modality, the post-buckling instability of the skin element is taken advantage of to obtain both the static and the dynamic working by using only tangential piezoactuators; in the third modality, particular piezoactuators, the thunder, are used to obtain very large vibrations. Numerical models aimed at predicting the static and dynamic displacements were realized. In order to verify the numerical results, two different experimental prototypes were realized.
An adaptive bump for transonic shock wave drag reduction
Ein adaptives Außenhautelement zur Verringerung des transsonischen Stoßwellenwiderstandes
2002
8 Seiten, 15 Bilder, 2 Tabellen, 5 Quellen
Conference paper
English
Adaptive Airfoils for Drag Reduction at Transonic Speeds
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