通过实验测试,以动态旋转平台模拟风力机风向变化及偏航对风,研究不同偏航速度及偏航延时时间对风力机叶片应力及功率的影响。结果表明：动态偏航对风过程中,应力值基本呈由前缘向后缘、叶根向叶尖递减的趋势,在叶展方向0.67R及0.75R处,叶根弦向方向0.25c及0.50c处出现应力集中现象,偏航延时时间的加入可有效抑制叶片应力波动,过慢的偏航速度会导致功率曲线出现较大波动。引入一无量纲系数,该系数为风力机功率及叶片应力的比值,通过分析得知在仅考虑风力机叶片应力及功率时,风力机最佳偏航速度为0.5°/s。
Abstract
Through the experimental tests, the dynamic rotating platform is used to simulate the wind direction change and the yaw motion of the wind turbine. The effects of different yaw speed and yaw delay time on blade stress and power were studied. The results show that In the process of dynamic yaw motion, the stress value decreases gradually from the leading edge to the trailing edge of the blade and from the blade root to the tip. The stress concentration occurs at 0.67R and 0.75R in blade spanwise direction, 0.25c and 0.5c in chord direction of blade root. The yaw delay time can effectively suppress the blade stress fluctuation. Too slow yaw speed will lead to large fluctuation of power curve. The dimensionless coefficient is introduced, which is the ratio of power and blade stress. Through analysis, it is known that when only the stress and power of wind turbine blade are considered, the optimal yaw speed of wind turbine is 0.5°/s.
关键词
风力机 /
输出功率 /
应力分析 /
叶片 /
偏航运动 /
偏航速度 /
偏航延时
Key words
wind turbines /
output power /
stress analysis /
blades /
yaw motion /
yaw speed /
yaw delay
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] CHEHOURI A, YOUNES R, ILINCA A, et al.Review of performance optimization techniques applied to wind turbines[J]. Applied energy, 2015, 142: 361-388.
[2] WAN S T, CHENG L F, SHENG X L.Effects of yaw error on wind turbine running characteristics based on the equivalent wind speed model[J]. Energies, 2015,8(7):6286-6301.
[3] QIU Y X, WANG X D, KANG S, et al.Predictions of unsteady HAWT aerodynamics in yawing and pitching using the free vortex method[J]. Renewable energy, 2014, 70: 93-106.
[4] FRIEDMANN P P.Aeroelastic modeling of large wind turbines[J]. Journal of the American Helicopter Society, 1976, 21(4): 17-27.
[5] EBRAHIMI A, SEKANDARI M.Transient response of the flexible blade of horizontal-axis wind turbines in wind gusts and rapid yaw changes[J]. Energy, 2018, 145: 261-275.
[6] KE S T, WANG T G, GE Y J, et al.Wind-induced fatigue of large HAWT coupled tower-blade structures considering aeroelastic and yaw effects[J]. The structural design of tall and special buildings, 2018, 27(9): e1467.
[7] VAN DIJK M T, VAN WINGERGEN J W, ASHURI T, et al. Yaw-misalignment and its impact on wind turbine loads and wind farm power output[J]. Journal of physics: conference series, 2016, 753: 062013.
[8] KRA GH K A, HANSEN M H. Load alleviation of wind turbines by yaw misalignment[J]. Wind energy, 2014, 17(7): 971-982.
[9] SANTO G, PEETERS M, VAN PAEPEGEM W, et al.Effect of rotor-tower interaction, tilt angle, and yaw misalignment on the aeroelasticity of a large horizontal axis wind turbine with composite blades[J]. Wind energy, 2020, 23(7): 1578-1595.
[10] SCHULA C, LETZGUS P, LUTZ T, et al.CFD study on the impact of yawed inflow on loads, power and near wake of a generic wind turbine[J]. Wind energy, 2017, 20(2): 253-268.
[11] DEL C V, RAGNI D, MICALLEF D, et al.Estimation of loads on a horizontal axis wind turbine operating in yawed flow conditions[J]. Wind energy, 2015, 18(11): 1875-1891.
[12] FARAG W, EL-HOSARY M, KAMEL A, et al.Analysis of various yaw control techniques for large wind turbines[J]. Journal of engineering research, 2019, 7: 215-231.
[13] BASTANKHAH M, PORTE A.Wind farm power optimization via yaw angle control: a wind tunnel study[J]. Journal of renewable and sustainable energy, 2019, 11(2): 023301.
[14] UMBERTO C, ROTEA M A, STEFANO L.Effect of the turbine scale on yaw control[J]. Wind energy, 2018,21(12): 1395-1405.
PDF(2027 KB)
