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• W2315661597 abstract "Predicting force production on a wing operating in the low Reynolds number, high angle of attack flight regime is challenging, largely due to massive flow separation and the formation of strong vortices at the leading and trailing edges. This study investigates purely surging and purely pitching aspect ratio (AR) 4 rectangular flat plates, and examines the accuracy of a semi-empirical potential flow model aimed at predicting lift using three input parameters: leading edge vortex position, total circulation above the wing, and steadystate lift coefficient. Both pitch (from α = 0◦ to 45◦) and surge (at a fixed incidence angle of α = 45◦) motions were performed over 1 and 6 chord-lengths of travel, representing a “fast” and a “slow” motion. An ancillary product of this work is a comprehensive characterization of the vortex trajectory and circulation above the wing throughout its motion. Particle image velocimetry (PIV) was performed to acquire time-resolved velocity fields used to calculate vortex position and strength. A vortex tracking algorithm, using the Γ1 function, reveals the temporal and spatial evolution of leading edge vortices throughout the wing motion, and, coupled with circulation measurements, provides a complete description of vortex behavior. The potential flow model proposed in the present work captured the overall trends observed in the experimental force histories, but it also greatly over-predicted lift. A correction factor, based on known steady state values at each angle of attack, was included to account for stalled conditions. This method was found to predict lift within 20% of the direct force measurements for s/c ≤ 4 . However, the model does not account for non-circulatory forces and thus does not capture the inertial transients in lift during startup." @default.
• W2315661597 created "2016-06-24" @default.
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• W2315661597 date "2015-01-03" @default.
• W2315661597 modified "2023-09-25" @default.
• W2315661597 title "A Semi-Empirical Approach to Modeling Lift Production" @default.
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• W2315661597 doi "https://doi.org/10.2514/6.2015-1748" @default.
• W2315661597 hasPublicationYear "2015" @default.
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