LAPSE:2023.33079
Published Article
LAPSE:2023.33079
Far Wake and Its Relation to Aerodynamic Efficiency
Sidaard Gunasekaran, Aaron Altman
April 20, 2023
Correlations were found between the aerodynamic efficiency and the mean and fluctuating quantities in the far wake of a wall-to-wall SD7003 model and an AR 4 flat plate. This correlation was described algebraically by modeling the wake signature as a function of wing geometry and initial conditions. The model was benchmarked against experimental results to elicit the wing performance as a function of angle of attack by interrogating the wake. In these algebraic models, the drag coefficient along with other initial conditions of the turbulent generator (either airfoil or wing) were used to reconstruct the Reynolds Stress distribution and the momentum deficit distribution in the turbulent wake. Experiments were undertaken at the United States Air Force Research Labs Horizontal Free Surface Water Tunnel (AFRL/HFWT). These experiments build on previous results obtained at the University of Dayton Low Speed Wind Tunnel (UD-LSWT) on a cylinder, an AR 7 SD7062 wing, and a small remote control twin motor aircraft. The Reynolds stress and the momentum deficit of the turbulent generators were experimentally determined using Particle Image Velocimetry (PIV) with a minimum of 1000 image pairs averaged at each condition. The variation of an empirical factor (γ) used to match the Reynolds stress and momentum deficit distributions showed striking correlation to the variation of drag and aerodynamic efficiency of the turbulent generator. This correlation suggests that the wing performance information is preserved in the free shear layer 10 chord lengths downstream of the trailing edge (TE) of the wing irrespective of the dimensionality of the flow.
Keywords
self preserved wake, turbulence, wake stratification, wing performance
Subject
Suggested Citation
Gunasekaran S, Altman A. Far Wake and Its Relation to Aerodynamic Efficiency. (2023). LAPSE:2023.33079
Author Affiliations
Gunasekaran S: Department of Mechanical and Aerospace Engineering, University of Dayton, 300 College Park, Dayton, OH 45469, USA
Altman A: Air Force Research Labs, Dayton, OH 45433, USA
Journal Name
Energies
Volume
14
Issue
12
First Page
3641
Year
2021
Publication Date
2021-06-18
Published Version
ISSN
1996-1073
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Original Submission
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PII: en14123641, Publication Type: Journal Article
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LAPSE:2023.33079
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doi:10.3390/en14123641
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Apr 20, 2023
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CC BY 4.0
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