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Effect of steady and transient wind shear on the wake structure and performance of a horizontal axis wind turbine rotor
Date
2009-12-01
Author
Sezer Uzol, Nilay
Uzol, Oğuz
Metadata
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This paper presents an investigation of the effect of steady and transient freestream wind shear on the wake structure and performance characteristics of a horizontal axis wind turbine rotor. A new 3-D unsteady vortex-panel method potential flow solver based on a free-vortex-wake methodology, AeroSIM, is used for this purpose. The code is validated using the experimental data from the NREL UAE experiments, as well as checked against the theoretical models developed by previous researchers. Three-different in-flow cases, i.e. uniform in-flow, steady vertical wind shear that uses a power law velocity profile (Normal Wind Profile, NWP) and transient Extreme Wind Shear (EWS), cases are investigated. The results show that the existence of the wind shear in the freestream can create substantial asymmetries and non-periodicities in the structure of the wake behind the turbine rotor. In addition, the blades get subjected to asymmetrical surface pressure variations which in turn result in high amplitude fluctuations in power and thrust levels generated by the turbine.
URI
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=78549250736&origin=inward
https://hdl.handle.net/11511/96899
Conference Name
47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition
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Department of Aerospace Engineering, Conference / Seminar
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Effect of steady and transient wind shear on the wake structure and performance of a horizontal axis wind turbine rotor
SEZER UZOL, NİLAY; Uzol, Oğuz (2013-01-01)
This paper presents an investigation of the effect of steady and transient free-stream wind shear on the wake structure and performance characteristics of a horizontal axis wind turbine rotor. A new three-dimensional unsteady vortex-panel method potential flow solver based on a free-vortex wake methodology, AeroSIM+, is used for this purpose. The code is validated using the experimental data from the National Renewable Energy Laboratory Unsteady Aerodynamics Experiments. The effects of vortex core model, co...
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Effects of inflow boundary layer on the wake of a radially non-uniform porous disk
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This study presents the results of an experimental investigation focusing on the effects of the inflow boundary layer on the wake characteristics of a 0.12 m diameter porous disk with radially non-uniform porosity in terms of mean flow, turbulence, and wake scaling. Two-dimensional two-component particle image velocimetry measurements within the wake are performed up to 7.5 diameters downstream as the disk is lowered deeper into a boundary layer that is representative of a neutral atmospheric boundary layer...
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N. Sezer Uzol and O. Uzol, “Effect of steady and transient wind shear on the wake structure and performance of a horizontal axis wind turbine rotor,” presented at the 47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, Orlando, FL, Amerika Birleşik Devletleri, 2009, Accessed: 00, 2022. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=78549250736&origin=inward.
