摘要
为研究剪切指数对风力机尾迹流动特性的影响,以NREL Phase VI型风力机为研究对象,采用SST k-ω湍流模型,在不同剪切指数下对风力机尾迹流场进行定常数值模拟。考察了不同来流剪切工况下,风力机尾迹流场中漩涡结构变化对速度和湍动能等流动参数的影响。结果表明:在剪切来流工况下尾迹流场呈现非对称性,尾迹流场向远离壁面的方向偏斜;随着剪切指数的增大,轮毂上方的中心涡强度增大,下方中心涡强度减弱;下方流体被大量卷吸进上方剪切层,形成高速条带;中心涡的不对称性造成尾迹流场湍动能增强,尾迹流场恢复减慢。
In order to study the influence of shear index on wake characteristics of the wind turbine,taking NREL Phase VI wind turbine as the research object,the steady numerical simulation of wake flow field for wind turbine at different shear indexes was carried out by using SST k-ωturbulence model.Moreover,the effects of vortex structure in wind turbine wake on following flow parameters were investigated at different shear inflow conditions,such as velocity and turbulent kinetic energy.Results show that the wake flow field becomes asymmetric under the shear inflow condition,and the wakes deviate away from the wall.With the increase of shear index,the strength of the central vortex above the hub increases,while the strength of the central vortex below the hub decreases.A narrow high-speed strip can be found in the wake due to the fact that the lower part fluid is heavily sucked into the upper shear layer.The turbulent kinetic energy of the wake flow field would be increased and the recovery of the wake velocity would slow down due to the non-asymmetry of the central vortex.
作者
王天凡
施鎏鎏
WANG Tianfan;SHI Liuliu(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering,Shanghai 200093,China;Key Laboratory for Power Machinery and Engineering of Ministry of Education,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2021年第10期877-882,891,共7页
Journal of Chinese Society of Power Engineering
基金
国家自然科学基金青年资助项目(11602143)
国家自然科学基金重大研究计划资助项目(91852117)
上海交通大学动力机械与工程教育部重点实验室开放课题。
关键词
风力机
尾迹
非对称性
中心涡
wind turbine
wakes
non-asymmetry
central vortex
