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Title: Flow field of oscillating wings
Keywords: oscillating wing, insect flight, impulsively started, reduced frequency, unsteady flow, particle image velocimetry
Issue Date: 27-Oct-2005
Citation: CHNG TAT LOON (2005-10-27). Flow field of oscillating wings. ScholarBank@NUS Repository.
Abstract: Particle Image Velocimetry is employed to study the effects of reduced frequency, angular amplitude and wing geometry on an impulsively started aerofoil. The forced sinusoidal oscillation is about a mid-chord, spanwise axis and at a Reynolds number of 1000, with amplitudes between 20A? to 60A?. For the fixed incidence cases, the flow field is one fairly similar to that of a bluff body, with the formation of a von Karman vortex street. The oscillatory cases suggest that the effective angle of attack profile, which is a function of both the reduced frequency and angular amplitude, is the dominant parameter that governs the flow. On a separate note, the effect of wing geometry is less pronounced and affects only the strength of the resulting vortices. Additional experiments conducted for the fixed incidence cases indicate that the flow field is fairly insensitive to changes in the Reynolds number within 1000.
Appears in Collections:Master's Theses (Open)

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