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Visualization Study on the Phase Difference of a Dragonfly Type Wing  

Kim Hyun Seak (한국항공대학교 항공운항학과)
Kim Song Hak (한국항공대학교 항공우주 및 기계공학부)
Chang Jo Won (한국항공대학교 항공운항학과)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.8, no.4, 2004 , pp. 43-54 More about this Journal
Abstract
A visualization study was carried out to investigate the effects of phase difference qualitatively by examining wake pattern on the phase difference of a dragonfly type wing model. The model was built with scaled-up, flapping wings composed of a paired wing with fore- and hind-wings in tandem that mimick the wing form of a dragonfly. The present study was conducted by using the smoke-wire technique and an electronic device below the tandem wings was mounted to find the exact wing position angles. Uncertainties in wing position angle are about $\pm$$1.0^{\cire}$ and instantaneous wing positional angle varies from $-16.5^{\cire}$ to $+22.8^{\cire}$. The tests were made at phase differences between the fore-wing and hind-wing at $0^{\cire}$, $90^{\cire}$, $180^{\cire}$ and $270^{\cire}$. The results show that Karman vortex structures were produced at phase differences of $90^{\cire}$, $180^{\cire}$ and $270^{\cire}$, but Karman vortex structures were not observed at the phase difference of $0^{\cire}$.
Keywords
Visualization; Phase Difference; Flapping; Karman Vortex;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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