摘要
在规模化风电场中,多机组尾流相互干扰对机组能量转换、区域大气边界层结构有着显著的影响。为研究湍流来流条件下错列布局风电场尾流演变统计特性,在边界层型风洞中,错列布置6排15台水平轴风力机阵列,利用热线风速仪对尾流场进行高频率数据采集。结果表明:相比串列布局,错列布局能够显著提高尾流主流向速度恢复水平,具有提高输出功率的潜力;同时,降低风电场内部流动相关性,风力机迎风面的湍流积分尺度变小;风电场采用紧凑布局时,需要考虑上游两侧风力机后方的局部高湍流强度区对下游风力机叶尖载荷的影响。基于速度谱分析,进一步量化在流场能量输运过程中,各尺度涡旋运动对尾流湍动能贡献度的变化,在近尾流区,流场受到风力机旋转的显著影响,而在远尾流场,低频、大尺度的尾流蜿蜒成为主导。
Within large-scale wind farms, the interaction of multi wakes has a significant impact on energy conversion and local atmospheric boundary layer structure. To study the statistical characteristics of wake evolution of staggered wind farms under turbulent inflow conditions, 6 rows of 15horizontal axis wind turbines are staggered in the boundary layer type wind tunnel, and the high-resolution data collection of wakes is carried out by hot-wire anemometer.The results show that compared with the aligned layout, the staggered layout can significantly improve the recovery level of the mainstream velocity of the wake, and has the potential to improve the output power. At the same time, the flow correlation in the wind farm is reduced and the turbulence integral scale on the windward side of the wind turbine becomes smaller. When the wind farm adopts compact layout,the influence of local high turbulence intensity behind the wind turbines, on both sides of the upwind, on the blade tip load of the downwind turbine needs to be considered. Based on the velocity spectrum analysis, the contribution of multi-scale turbulent motion to the turbulent kinetic energy of the wake is further quantified. In the near wake region, the flow field is significantly affected by the rotation of the wind turbine, while in the far wake, the low-frequency and large-scale wake meandering becomes the dominant.
作者
郑一丹
刘惠文
郑源
赵振宙
袁凌
ZHENG Yidan;LIU Huiwen;ZHENG Yuan;ZHAO Zhenzhou;YUAN Ling(College of Energy and Electrical Engineering,Hohai University,Nanjing 211100,Jiangsu Province,China;CHN Energy United Power Technology Co.,Ltd.,Dongcheng District,Beijing 100039,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2023年第4期1463-1470,共8页
Proceedings of the CSEE
基金
国家自然科学基金项目(52106239,51809082)
中央高校基本科研业务费项目(B220202001)
风电设备及控制国家重点实验室开放基金(FDKT2020-01)。
关键词
风电场
尾流
湍流
风洞
湍流积分尺度
功率谱密度
wind farm
wakes
turbulence
wind tunnels
turbulent integral scale
power spectral density
