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流动显示和图像处理期刊
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN 打印: 1065-3090
ISSN 在线: 1940-4336

流动显示和图像处理期刊

DOI: 10.1615/JFlowVisImageProc.2018027151
pages 145-162

FLOW AROUND A CORRUGATED AIRFOIL

P. Sooraj
Department of Mechanical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 4000076, India
Amit Agrawal
Department of Mechanical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 4000076, India

ABSTRACT

The flight of a dragonfly, similar to many insects and small birds, is very much determined by the corrugation on its wings. A particle image velocimetry (PIV)-based study is conducted here on a rigid corrugated wing for a Reynolds number (Re) of 300-12,000 to better understand the mechanism of dragonfly flight. Two different angles of attack (5° and -5°) are considered in the study. This is perhaps the first flow visualization study using PIV where flow around a corrugated airfoil at a negative angle of attack has been explored. It is found that the shape of the corrugation plays an important role in producing vortices. Bigger vortices are observed at the -5° angle of attack compared to that of +5°. Also the shedding of vortices starts at lower Reynolds numbers for -5°. The vortices grow in the valleys of corrugation for a while before shedding; the frequency of shedding from a valley is half that for its immediate upstream valley. The vortices trapped in the valleys dictate the shape of the virtual airfoil formed around the corrugated wing. It is also found that the shape of the virtual airfoil formed around the corrugated sheet is similar to that of Prandtl-D root-ns airfoils.


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