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• W2151970749 endingPage "1939" @default.
• W2151970749 startingPage "1930" @default.
• W2151970749 abstract "SUMMARY Over the last decade, interest in animal flight has grown, in part due to the possible use of flapping propulsion for micro air vehicles. The importance of unsteady lift-enhancing mechanisms in insect flight has been recognized, but unsteady effects were generally thought to be absent for the flapping flight of larger animals. Only recently has the existence of LEVs (leading edge vortices) in small vertebrates such as swifts, small bats and hummingbirds been confirmed. To study the relevance of unsteady effects at the scale of large birds [reduced frequency k between 0.05 and 0.3, k=(πfc)/U∞; f is wingbeat frequency, U∞ is free-stream velocity, and c is the average wing chord], and the consequences of the lack of kinematic and morphological refinements, we have designed a simplified goose-sized flapping model for wind tunnel testing. The 2-D flow patterns along the wing span were quantitatively visualized using particle image velocimetry (PIV), and a three-component balance was used to measure the forces generated by the wings. The flow visualization on the wing showed the appearance of LEVs, which is typically associated with a delayed stall effect, and the transition into flow separation. Also, the influence of the delayed stall and flow separation was clearly visible in measurements of instantaneous net force over the wingbeat cycle. Here, we show that, even at reduced frequencies as low as those of large bird flight, unsteady effects are present and non-negligible and have to be addressed by kinematic and morphological adaptations." @default.
• W2151970749 created "2016-06-24" @default.
• W2151970749 creator A5000055792 @default.
• W2151970749 creator A5005385837 @default.
• W2151970749 date "2010-06-01" @default.
• W2151970749 modified "2023-10-15" @default.
• W2151970749 title "The importance of leading edge vortices under simplified flapping flight conditions at the size scale of birds" @default.
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• W2151970749 doi "https://doi.org/10.1242/jeb.040857" @default.
• W2151970749 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20472780" @default.
• W2151970749 hasPublicationYear "2010" @default.
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