Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/17583
Title: Aerodynamics of a Heaving and pitching aerofoil
Authors: OO GUAN YU, ALVIN
Keywords: DPIV, heaving and pitching aerofoil, advance ratio, reduced frequency, effective angle of attack
Issue Date: 23-Jan-2007
Source: OO GUAN YU, ALVIN (2007-01-23). Aerodynamics of a Heaving and pitching aerofoil. ScholarBank@NUS Repository.
Abstract: Biological flapping foils like insect wings generate forces efficiently at low Reynolds numbers. Two dimensional Digital Particle Image Velocimetry (DPIV) was used to study the unsteady flows of a simplified flapping foil model, that of a heaving and pitching elliptical aerofoil. The aerofoil was subjected to a uniform free stream in a water tunnel with a constant low Reynolds number of 1000. Two series of experiments were conducted. In the first, advance ratio and reduced frequency was varied from 0.0919 to 0.276 and 0.1 to 2.0 respectively for a sinusoidally heaving aerofoil at constant 0o pitch angle. In the second, the pitch angle was varied to maintain square wave form effective angle of attack profiles of 0o to 45o while varying the advance ratio. The formation and shedding of leading and trailing vortices were governed by the advance ratio, the reduced frequency and the effective angle of attack. The interaction of these vortices with the aerofoil and with each other gave rise to different wake structures and different amounts of thrust.
URI: http://scholarbank.nus.edu.sg/handle/10635/17583
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0_Before_text.pdf135.44 kBAdobe PDF

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0_Coverpage.pdf6.58 kBAdobe PDF

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1_Introduction.pdf15.05 kBAdobe PDF

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2_LiteratureReview.pdf2.22 MBAdobe PDF

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3_DescriptionOfExperiment.pdf312.71 kBAdobe PDF

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4_Results_ReducedFreqAdvanceRatio.pdf2.38 MBAdobe PDF

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5_Results_EffectiveAngleofAttack.pdf2.16 MBAdobe PDF

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6_Conclusion.pdf35.89 kBAdobe PDF

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7_References.pdf15.25 kBAdobe PDF

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8_Appendix.pdf48.06 kBAdobe PDF

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