In this study, two atmospheric boundary layer wind fields characterized by mean wind shear index and turbulence intensity were generated in wind tunnel. Subsequently, the load and power characteristics of wind turbines were experimentally investigated under uniform incoming flow and generated atmospheric boundary layer conditions. The results show that the axial load of the wind turbine decreases, while the fatigue load increases when it is yawing. Additionally, the turbine power coefficient and optimal tip velocity ratio both decrease as the yaw angle increases. Under the inflow condition of the atmospheric boundary layer, both the mean bending moment coefficient and power coefficient of the wind turbine exhibit an increase compared to the uniform inflow condition, The fatigue load, extreme load and unsteady characteristics of output power increase significantly, and the probability distribution of power coefficient aligns more closely with a Gaussian distribution. Additionally, the wind turbine power coefficient spectrum exhibits a certain level of correlation with the atmospheric boundary layer incoming velocity spectrum, and within the coupling interval, there exists a power rate relationship of Φp/Φu~f -2. When the frequency exceeds approximately three times the rotation frequency, the power coefficient spectral curve exhibits a predominantly horizontal trend, indicating the decoupling of modulation effects between turbulent incoming flow and power output. Following this decoupling, wind turbine power output is minimally influenced by turbulent incoming flow, with its spectral response primarily dependent on wind turbine characteristics.
Key words
horizontal axis wind turbines /
atmospheric boundary layer /
turbulence /
power /
load /
wind tunnel experiment
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
[1] SEZER-UZOL N, UZOL O.Effect of steady and transient wind shear on the wake structure and performance of a horizontal axis wind turbine rotor[J]. Wind energy, 2013, 16(1): 1-17.
[2] ROBERTSON A, SETHURAMAN L, JONKMAN J M. Assessment of wind parameter sensitivity on extreme and fatigue wind turbine loads[C]//2018 Wind Energy Symposium. Kissimmee, Florida, USA, 2018: AIAA2018-1728.
[3] VEERS P, DYKES K, LANTZ E, et al. Grand challenges in the science of wind energy[J]. Science, 2019, 366(6464): eaau2027.
[4] ZHANG W, MARKFORT C D, PORTÉ-AGEL F.Near-wake flow structure downwind of a wind turbine in a turbulent boundary layer[J]. Experiments in fluids, 2012, 52(5): 1219-1235.
[5] TIAN W, OZBAY A, HU H.A wind tunnel study of wind loads on a model wind turbine in atmospheric boundary layer winds[J]. Journal of fluids and structures, 2019, 85: 17-26.
[6] 李德顺, 郭涛, 李伟, 等. 中性大气边界层中风力机的湍流演化及叶根载荷分析[J]. 科学通报, 2019, 64(17): 1832-1843.
LI D S, GUO T, LI W, et al.Evolution of turbulence in a wind turbine flow field with a neutral atmospheric boundary layer and an analysis of the blade root load[J]. Chinese science bulletin, 2019, 64(17): 1832-1843.
[7] DIMITROV N, NATARAJAN A, MANN J.Effects of normal and extreme turbulence spectral parameters on wind turbine loads[J]. Renewable energy, 2017, 101: 1180-1193.
[8] DAI J C, YANG X, HU W, et al.Effect investigation of yaw on wind turbine performance based on SCADA data[J]. Energy, 2018, 149: 684-696.
[9] MILAN P, WÄCHTER M, PEINKE J. Turbulent character of wind energy[J]. Physical review letters, 2013, 110(13): 138701.
[10] EGGERS A J Jr, DIGUMARTHI R, CHANEY K. Wind shear and turbulence effects on rotor fatigue and loads control[J]. Journal of solar energy engineering, 2003, 125(4): 402-409.
[11] BARTHELMIE R J, CHURCHFIELD M J, MORIARTY P J, et al.The role of atmospheric stability/turbulence on wakes at the Egmond aan Zee offshore wind farm[J]. Journal of physics: conference series, 2015, 625: 012002.
[12] DÖRENKÄMPER M, TAMBKE J, STEINFELD G, et al. Atmospheric impacts on power curves of multi-megawatt offshore wind turbines[J]. Journal of physics: conference series, 2014, 555: 012029.
[13] NANDI T N, HERRIG A, BRASSEUR J G.Non-steady wind turbine response to daytime atmospheric turbulence[J]. Philosophical transactions of the Royal Society A, Mathematical, physical, and engineering sciences, 2017, 375(2091): 20160103.
[14] GAO L Y, YANG S, ABRAHAM A, et al.Effects of inflow turbulence on structural response of wind turbine blades[J]. Journal of wind engineering and industrial aerodynamics, 2020, 199: 104137.
[15] CHAMORRO L P, LEE S J, OLSEN D, et al.Turbulence effects on a full-scale 2.5 MW horizontal-axis wind turbine under neutrally stratified conditions[J]. Wind energy, 2015, 18(2): 339-349.
[16] 杨从新, 王印, 李寿图, 等. 基于实验分析入流湍流积分尺度对水平轴风力机功率波动的影响[J]. 太阳能学报, 2021, 42(8): 408-413.
YANG C X, WANG Y, LI S T, et al.Experimental study on influence of inflow turbulence integral scale on power fuctuation of horizontal axis wind turbine[J]. Acta energiae solaris sinica, 2021, 42(8): 408-413.
[17] 张旭耀. 复杂来流条件下水平轴风力机流场特性与气动载荷研究[D]. 兰州: 兰州理工大学, 2019.
ZHANG X Y.Study on flow field characteristics and aerodynamic loads of horizontal axis wind turbine under complicated inflow conditions[D]. Lanzhou: Lanzhou University of Technology, 2019.
[18] 李银然, 赵丽, 李德顺, 等. 偏航工况下叶片翼型动态特性研究[J]. 太阳能学报, 2022, 43(7): 326-333.
LI Y R, ZHAO L, LI D S, et al.Study on dynamic characteristics of blade airfoil under yaw condition[J]. Acta energiae solaris sinica, 2022, 43(7): 326-333.
PDF(3191 KB)
