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- W2040590085 abstract "The effect of varying airfoil thickness and camber on plunging and combined pitching and plunging airfoil propulsion at Reynolds number Re=200, 2000, 20 000 and 2×106 was studied by numerical simulations for fully laminar and fully turbulent flow regimes. The thickness study was performed on 2-D NACA symmetric airfoils with 6–50% thick sections undergoing pure plunging motion at reduced frequency k=2 and amplitudes h=0.25 and 0.5, and for combined pitching and plunging motion at k=2, h=0.5, phase ϕ=90°, pitch angle θo=15° and 30° and the pitch axis was located at 1/3 of chord from leading edge. At Re=200 for motions where positive thrust is generated, thin airfoils outperform thick airfoils. At higher Re significant gains could be achieved both in thrust generation and propulsive efficiency by using a thicker airfoil section for plunging and combined motion with low pitch amplitude. The camber study was performed on 2-D NACA airfoils with varying camber locations undergoing pure plunging motion at k=2, h=0.5 and Re=20 000. Little variation in thrust performance was found with camber. The underlying physics behind the alteration in propulsive performance between low and high Reynolds numbers has been explored by comparing viscous Navier–Stokes and inviscid panel method results. The role of leading edge vortices was found to be key to the observed performance variation." @default.
- W2040590085 created "2016-06-24" @default.
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- W2040590085 date "2011-02-01" @default.
- W2040590085 modified "2023-10-10" @default.
- W2040590085 title "Reynolds number, thickness and camber effects on flapping airfoil propulsion" @default.
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- W2040590085 doi "https://doi.org/10.1016/j.jfluidstructs.2010.11.010" @default.
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