Influence of hub height difference or upstream wind turbine yaw angle on wind turbines total power output

doi:10.11975/j.issn.1002-6819.2018.22.019

IR > 新能源学院

	Influence of hub height difference or upstream wind turbine yaw angle on wind turbines total power output
	Yang, Congxin1,2 ; He, Pan 1; Zhang, Xuyao 1; Zhang, Yaguang 1; Jin, Rui 1
	2018-11-15
发表期刊	Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
ISSN	10026819
卷号	34 期号:22 页码:155-161
摘要	In this paper, in order to obtain a method of increasing the power output of the downstream wind turbine by reducing the wake effect of the upstream wind turbine, NREL 5 MW wind turbines were used as research objects, and we coupled large-eddy simulation with an actuator line technique based on OpenFOAM open-source software as our numerical method. Firstly, the Gaussian width (Ε) in the actuator line model was studied at the rated wind speed, we found that the error of the calculation result was the smallest when there were 50 mesh nodes along the direction of rotor diameter and Ε was 1.6 times grid scale; Secondly, numerical simulations were carried out for a single wind turbine with tip-speed ratios (λ) of 15, 10, 8 and 7, respectively (corresponding to inflow wind speeds was 3, 5, 7, 11.4 m/s). It was found that the wake velocity distribution was "W" type in the near-wake of the wind turbine, and with the development of the wake, the wake velocity distribution was "inverted bell" type in the far-wake of the wind turbine. The wake velocity distribution of wind turbine was related to λ. When λ was larger, the velocity loss in the near-wake field was larger, and the velocity of the wake field recovers faster. λ was smaller, the velocity loss in the near wake region was small, and the velocity recovery in the wake field was relatively slow. When λ was 15, 10, 8, and 7, respectively, the average speed loss at a position of 1 times rotor diameter (D) after the wind turbine was 45.7%, 42.4%, 38.8%, and 33.8%, respectively. When the wake developed to 18D, compared to the 1D position, the velocity recovered by 35.4%, 32.4%, 29.6% and 18.6% in order. Finally, through the numerical simulation of two wind turbines in tandem, two strategies by reducing the wake effect of upstream wind turbine to increase the output power of downstream wind turbine were studied. During the simulation, the distance between the two wind turbines was six times of the rotor diameter, and the inflow speeds was 5 m/s, 7 m/s and 11.4 m/s, respectively. It was found that when the hub heights of the two wind turbines were different or the upstream wind turbine had a yaw angle, the power output of the downstream wind turbine can be increased. Under the condition that the inflow velocity was 7 m/s, when the difference between the hub heights of the upstream and downstream wind turbines was 0.25D, 0.5D and 0.75D, respectively, compared with the situation of 0D,the power output of the downstream wind turbine increased by 1.36, 2.50, 4.50 times and the total power of the two wind turbines increased by 20%, 56% and 66%, respectively. When the yaw angles of the upstream wind turbines were 15°, 30° and 45°, respectively, compared with the situation of 0°, the power outputs of the downstream wind turbines increased by 1.58, 3.36, 4.26 times and the total rate of the two wind turbines increased by 18%, 30% and 22%, respectively. The above research results can provide reference for wind turbine selection in wind farms and increase wind farm power output by controlling operating conditions of upstream wind turbine. © 2018, Editorial Department of the Transactions of the Chinese Society of Agricultural Engineering. All right reserved.
关键词	Actuators Electric utilities Electromagnetic wave propagation in plasma Large eddy simulation Numerical analysis Numerical methods Numerical models Open source software Open systems Thermoelectric power Velocity Velocity distribution Wakes Wind Wind power Actuator line technique Calculation results Hub height OpenFOAM Operating condition Output power Wake velocity distributions Yaw angles
DOI	10.11975/j.issn.1002-6819.2018.22.019
收录类别	EI
语种	中文
出版者	Chinese Society of Agricultural Engineering
EI入藏号	20191306691581
EI主题词	Wind turbines
EI分类号	443.1 Atmospheric Properties - 615.8 Wind Power (Before 1993, use code 611 ) - 631.1 Fluid Flow, General - 711.1 Electromagnetic Waves in Different Media - 723 Computer Software, Data Handling and Applications - 732.1 Control Equipment - 921 Mathematics - 921.6 Numerical Methods - 922.2 Mathematical Statistics
来源库	Compendex
分类代码	443.1 Atmospheric Properties - 615.8 Wind Power (Before 1993, use code 611 ) - 631.1 Fluid Flow, General - 711.1 Electromagnetic Waves in Different Media - 723 Computer Software, Data Handling and Applications - 732.1 Control Equipment - 921 Mathematics - 921.6 Numerical Methods - 922.2 Mathematical Statistics
引用统计	无
文献类型	期刊论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/114476
专题	新能源学院能源与动力工程学院
作者单位	1.School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou; 730050, China; 2.Key Laboratory of Fluid Machinery and Systems, Lanzhou; 730050, China
第一作者单位	新能源学院
第一作者的第一单位	新能源学院
推荐引用方式 GB/T 7714	Yang, Congxin,He, Pan,Zhang, Xuyao,et al. Influence of hub height difference or upstream wind turbine yaw angle on wind turbines total power output[J]. Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering,2018,34(22):155-161.
APA	Yang, Congxin,He, Pan,Zhang, Xuyao,Zhang, Yaguang,&Jin, Rui.(2018).Influence of hub height difference or upstream wind turbine yaw angle on wind turbines total power output.Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering,34(22),155-161.
MLA	Yang, Congxin,et al."Influence of hub height difference or upstream wind turbine yaw angle on wind turbines total power output".Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering 34.22(2018):155-161.