摘要
为研究湍流强度对风力机尾迹涡结构的影响规律,利用TR-PIV(time resolved-particle image velocimetry)对水平轴风力机模型在有、无格栅4.5D(D为风轮直径)范围内的尾流信息进行采集。通过定性及定量分析对比有、无格栅时尾迹流场瞬时涡量、平均涡量及湍动能的变化规律,再现了不同入流条件下尾迹涡形成、发展和湮灭的过程及尾迹涡系间能量传递特性。分析发现:自由流4.5D范围内均可见明显叶尖涡拟序结构,其衰减速度较慢。格栅入流时随湍流强度增加流层间的强剪切及径向掺混作用增强,使叶尖涡拟序结构失稳,2.5D时拟序结构消失;涡量集中区域较自由流明显扩张,叶尖涡诱导效应影响范围增加;尾迹涡系的湍动能较自由流明显增加,随着尾迹向下游发展叶尖涡、中心涡湍动能很快衰减,附着涡区湍动能却明显增强;附着涡区不再是隔离带,而是叶尖涡和中心涡的能量输送带,从而促进尾迹恢复。
In order to study turbulence effects on the wake vortex structure,the wake data are collected of the horizontalaxis wind turbine model in uniform and turbulent inflow by utilizing the TR-PIV within 4.5 D(D is diameter of the wind wheel).By qualitative and quantitative analyzing wake data,such as instantaneous vorticities,mean vorticity and turbulent kinetic energy,the energy transfer characteristics between wake vortex systems are investigated and the full formation,development and annihilation process of the wake vortex is reappeared.The experiment results show that coherent structure of tip vortex is obvious and its decay rate is slow in uniform flow within 4.5 D.Compared with uniform inflow because of strong shearing action between the layers the tip vortex coherent structure becomes instability and disappears in 2.5 D,the area of the vortex concentration is enlarged and entrainment effect of tip vortex increased,the turbulent kinetic energy of the wake vortex system is significantly increased,the tip vortex and the central vortex kinetic energy decay rapidly,the turbulent kinetic energy of the bounded vortex is obviously enhanced.The bounded vortex is no longer the isolation zone,but the energy transfer belt of the tip vortex and the central vortex,and then it promotes wake recovery in turbulent flow.
作者
韩玉霞
汪建文
李鑫
孙博
刘珍
Han Yuxia;Wang Jianwen;Li Xin;Sun Bo;Liu Zhen(College of Energy and Power Engineering,Inner Mongolia University of Technology,Hohhot010051,China;Key Laboratory of Wind Energy and Solar Energy Technology,Ministry of Education(Inner Mongolia University of Technology),Hohhot010051,China;Power Research Institute,Inner Mongolia Power(Group)Limited Liability Company,Hohhot010020,China;College of Mechanical Engineering,Inner Mongolia University of Technology,Hohhot010051,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2019年第4期1179-1184,共6页
Acta Energiae Solaris Sinica
基金
内蒙古自然科学基金(2017MS0526)
风能太阳能利用技术教育部重点实验室开放基金(2017MS06)
国家自然科学基金(51766014)
关键词
水平轴风力机
叶尖涡
湍流强度
尾流
高频PIV
horizontal axis wind turbine
tip vortices
turbulence intensity
wake
TR-PIV
