Effect of steady and transient wind shear on the wake structure and performance of a horizontal axis wind turbine rotor

Date

2013-01-01

Author

SEZER UZOL, NİLAY
Uzol, Oğuz

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

328
views

0
downloads

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, core size, expansion, and filament stretching on torque and thrust predictions are investigated. Three-different wind shear cases, i.e., uniform inflow (no wind shear), steady vertical wind shear that uses a power law velocity profile (Normal Wind Profile, NWP) and transient Extreme Wind Shear (EWS), are investigated. The results show that the existence of wind shear can create a very complex wake structure with substantial asymmetries, streamwise vorticity generation, and non-periodicities downstream of the turbine rotor. In addition, the blades are subjected to asymmetrical surface pressure variations that in turn result in high amplitude fluctuations in power and thrust levels generated by the turbine. Copyright (C) 2011 John Wiley & Sons, Ltd.

Subject Keywords

Windshear, Gust, HAWT, Horizontal axis wind turbine, Freewake

URI

https://hdl.handle.net/11511/34388

Journal

WIND ENERGY

DOI

https://doi.org/10.1002/we.514

Collections

Department of Aerospace Engineering, Article

Suggestions

OpenMETU
Core

Effect of steady and transient wind shear on the wake structure and performance of a horizontal axis wind turbine rotor Sezer Uzol, Nilay; Uzol, Oğuz (2009-12-01) 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 i...
Effects of mie vanes and tip injection on the performance and wake characteristics of HAWT Anik, Ezgi; Abdulrahim, Anas; Uzol, Oğuz (null; 2016-01-08) This paper presents the results of an experimental study that focuses on the tip leakage/vortex control of a model horizontal axis wind turbine rotor. The effects of Mie vanes and tip injection on the performance and wake characteristics of a model horizontal axis wind turbine rotor are investigated through experiments that are conducted by placing a specially designed three-bladed horizontal axis wind turbine rotor at the exit of an open-jet wind tunnel facility. The rotor blades are non-linearly twisted a...
Effects of tip injection on the performance and near wake characteristics of a model wind turbine rotor Abdulrahim, Anas; Anik, Ezgi; Ostovan, Yashar; Uzol, Oğuz (2016-04-01) This paper presents an investigation of the effects of tip injection on the performance and near wake characteristics of a model wind turbine rotor. Experiments are conducted by placing a three-bladed horizontal axis wind turbine rotor at the exit of an open-jet wind tunnel. The rotor blades are non linearly twisted and tapered with NREL 5826 airfoil profile. The nacelle, hub and the blades are specifically designed to allow pressurized air to pass through and get injected from the blade tips while the roto...
Effect of Fiber Orientation of Bend-Twist Coupled Blades on the Structural Performance of the Wind Turbine System Şener, Özgün; Kayran, Altan (2017-01-05) The effect of fibre angle of bend-twist coupled mixed GFRP-CFRP wind turbine blades on the structural performance of the wind turbine system is studied. For the structural performance evaluation, the effect of the use of off-axis plies in the main spar caps of the bendtwist coupled wind turbine blade on the reduction of damage correspondent internal loads in the whole wind turbine system, electrical power produced, tower-blade end gap, and maximum stress in the blades are taken as major criteria. Different ...
Effects of camberwise varying tip injection on loss and wake characteristics of a low pressure turbine blade Mercan, Bayram; Dogan, Eda; Ostovan, Yashar; Uzol, Oğuz (2015-08-01) This paper presents the results of an experimental study that investigates the effects of camberwise varying tip injection on the total pressure loss and wake flow characteristics downstream of a row of Low Pressure Turbine (LPT) blades. This injection technique involves spanwise jets at the tip that are issued from a series of holes distributed along the camber line. The injection from each hole is individually and separately controlled using a computer driven solenoid valve and therefore the flow injectio...

Citation Formats

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,” WIND ENERGY, pp. 1–17, 2013, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/34388.