Graduate Thesis Or Dissertation
 

Leading Edge Separation Analysis of Oscillating Airfoil Energy Harvesters

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/vm40z027r

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  • Oscillating foil energy harvesters are analyzed at optimal reduced frequencies (๐‘˜=๐‘“๐‘/๐‘ˆ) to determine how the leading edge radius of curvature affects leading edge separation. The understanding of leading edge separation and its behaviors is critical to predicting the transient lift profile of an airfoil. The separation is therefore also critical for predicting an airfoilโ€™s energy harvesting performance, especially when using low order models for design purposes. In this study, the data are collected using a wind tunnel experimental setup and by conducting numerical computations with the commercial software, ANSYS Fluent. Airfoils with leading edge radii of curvature varying from 0.004-0.04 [m] per chord length are subjected to a heaving and pitching motion, pivoting about the mid-chord, and yield reduced frequencies of 0.06-0.16 and Reynolds numbers 15,000-40,000 (๐‘…๐‘’=๐‘ˆ๐‘/๐œˆ). Results show that a correlation can be made to the initiation of leading edge flow separation using the leading edge pressure gradient and/or wall shear stress. Results also show increasing the leading edge radius of curvature leads to a linear delay in both temporal and spatial coordinates of separation initiation. Furthermore, increasing the system reduced frequency also linearly delays when separation initiation occurs but does not affect the location of separation initiation. A new shear velocity timescale is introduced to collapse the separation time over the range of reduced frequencies and radii of curvature.
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