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An MDO-based methodology for static aeroelastic scaling of wings under non-similar flow

Mas Colomer, Joan and Bartoli, Nathalie and Lefebvre, Thierry and Martins, Joaquim R. R. A. and Morlier, Joseph An MDO-based methodology for static aeroelastic scaling of wings under non-similar flow. (2021) Structural and Multidisciplinary Optimization, 63 (3). 1045-1061. ISSN 1615-147X

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Official URL: https://doi.org/10.1007/s00158-020-02804-z

Abstract

The classical aeroelastic scaling theory used to design scaled models is based on the assumption that complete flow similarity exists between the full aircraft and the scaled model. When this condition is satis- fied, the scaling problem of the model can be treated as a structural design problem only, where the scaled aerodynamic shape is preserved. If, on the other hand, this hypothesis no longer holds—if the scaled model is constrained to fly at low speed and low altitude, for example—and both the aerodynamic shape and the flexibility of the structure are exactly scaled, then the static response exhibits significant discrepancies in the aerodynamic loads and structural displacement. To de- sign a flying demonstrator with scaled static response when flow similarity cannot be fulfilled, we present a multidisciplinary optimization based method that al- lows some freedom in the design of the wing shape (while keeping the scaled wingspan) to update the wing geometry and structural properties to ensure equivalent scaled loads and overall wing displacement. To illustrate this method, we apply it to a 1:5 version of the uCRM wing at subsonic flight condition. While the errors in air loads using the classical theory are around 16%, the presented method achieves errors lower than 1%, with a good agreement for the wingtip displacement.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Ecole nationale supérieure des Mines d'Albi-Carmaux - IMT Mines Albi (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
French research institutions > Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > University of Michigan - U-M (USA)
Laboratory name:
Funders:
EU Project 658570—NextGen Airliners
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Deposited On:08 Mar 2021 14:28

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