An unconventional mechanism of lift production during the downstroke in a hovering bird (Zosterops japonicus)

Autor:	C. Y. Soong, Shang-Chieh Ting, Chieh-Cheng Liu, Yu-Hung Chang, Jing-Tang Yang
Rok vydání:	2011
Předmět:	Fluid Flow and Transfer Processes Lift (force) Mechanics of Materials Computational Mechanics General Physics and Astronomy Biology biology.organism_classification Marine engineering Zosterops japonicus
Zdroj:	Experiments in Fluids. 51:1231-1243
ISSN:	1432-1114 0723-4864
DOI:	10.1007/s00348-011-1145-8
Popis:	An unconventional mechanism of ventral clap is exploited by hovering passerines to produce lift. Quantitative visualization of the wake flow, analysis of kinematics and evaluation of the transient lift force was conducted to dissect the biomechanical role of the ventral clap in the asymmetrical hovering flight of passerines. The ventral clap can first abate and then augment lift production during the downstroke; the net effect of the ventral clap on lift production is, however, positive because the extent of lift augmentation is greater than the extent of lift abatement. Moreover, the ventral clap is inferred to compensate for the zero lift production of the upstroke because the clapping wings induce a substantial elevation of the lift force at the end of the downstroke. Overall, our observations shed light on the aerodynamic function of the ventral clap and offer biomechanical insight into how a bird hovers without kinematically mimicking hovering hummingbirds.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f8bb982d824e77d45477fdd7dc4e2928 https://doi.org/10.1007/s00348-011-1145-8 Zobrazit plný text záznamu Full text from SpringerLink