Browse > Article
http://dx.doi.org/10.5139/JKSAS.2017.45.2.85

An Experimental Study on Wake Flow-Field of NREL 5 MW Wind Turbine Model  

Kang, Seung-Hee (Chonbuk National University)
Ryu, Ki-Wahn (Chonbuk National University)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.45, no.2, 2017 , pp. 85-91 More about this Journal
Abstract
A wind tunnel test for 1/86 scaled down model of the NREL 5 MW offshore wind turbine was conducted to investigate the wake and flow fields. Deficit of flow speed in the wake region and variations of the turbulence intensity were measured using a hot wire anemometer at rated tip speed ratio of 11.4 m/s and a rotational speed of 1,045 rpm. According to the test results, velocity deficits along both of lateral and vertical directions were recovered within 2 rotor radii downstream from the rotating disc plane. The tip vortices effect was negligible after 5 rotor radii downstream from the rotating plane. Turbulence intensities showed maximum value around the blade tip, and decreased rapidly after one radius apart from the rotating plane, and those values were preserved until 6 rotor radii downstream.
Keywords
Wind Turbine Wake; NREL offshore 5 MW wind turbine(NREL 5 MW); Wind Tunnel Test; Hot-Wire Anemometer;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Sanderse, B., "Aerodynamics of Wind Farm Wakes," ECN-E-09-016, 2009.
2 Barthelmie, R. J. et al., "Flow and Wakes in Large Wind Farms: Final Report for UpWind WP8," Riso-R-1765(EN), 2011.
3 Vermeer, L. J., Sorensen, J. N., and Crespo, A., "Wind Turbine Wake Aerodynamics," Progress in Aerospace Sciences, Vol. 39, 2003.
4 Ko, K.-N., Park, M.-H., and Huh, J.-C., "An Analysis of Wake Effect in a Wind Farm," Journal of the Korean Society for Power System Engineering, Vol. 17, No. 2, 2013.4.
5 Kim, J., Kang, S.-H., and Ryu, K.-W, "Comparison of Aerodynamic Loads for Horizontal Axis Wind Turbine (I): with and without Turbulent Inflow," J. of The Korean Society for Aeronautical and Space Sciences, Vol. 44, No. 5, 2016, pp. 391-398.   DOI
6 Larsen, T. J., Madsen, H. A., Larsen, G. C., and Hansen, K. S.., "Validation of the Dynamic Wake Meander Model for Loads and Power Production in the Egmond aan Zee Wind Farm," Wind Energy, Vol. 16, 2013, pp. 605-624.   DOI
7 KAFA Subsonic Wind Tunnel, http://www.afa.ac.kr/index_frame_kk.html.
8 Operation Manual, "AEROTECH Probe Traverse System for KAFA," AEROTECH Ref. 9705
9 Jonkman, J., Butterfield, S., Musial, W., and Scott, G., "Definition of a 5-MW Reference Wind Turbine for Offshore System Development; National Renewable Energy Laboratory,"NREL TP-500-38060, 2009.
10 DANTEC Dynamics, Probe for Hot-wire Anemometry, 103-105-07.
11 Ryu, K.-W, Yoon, S.-J., Lee, C.-S. and Choy, S.-O., "Aerodynamic Performance for Horozontal Axis Wind Turbine Model using Subsonic Wind Tunnel," J. of The Korean Society for Aeronautical & Space Sciences, Vol. 35, No. 11, 2007.
12 Neff, D. E., Meroney, R. N., "Mean Wind and Turbulence Characteristics due to Induction Effects near Wind Turbine Rotors," J. of Wind Engineering and Industrial Aerodynamics, Vol. 69, No. 71, 1997