摘要
在进行风力机结冰问题的水滴收集率计算时,三维旋转效应的作用会改变叶片周围空气和水滴的流动,从而大大改变叶片气动性能和表面水滴收集。文章以NREL Phase VI风力机为研究对象,基于欧拉两相流模型对水滴流动及表面撞击特性进行计算,并与准三维计算结果进行比较,分析三维旋转效应对水滴绕流和收集率的影响。分析结果表明:在同一展向位置,三维旋转效应的存在会增加叶片表面最大水滴收集率及吸力面的水滴撞击区域,但对压力面水滴撞击区域的影响不明显;叶片表面的展向流动会将边界层内的水滴沿展向抽出,抑制水滴相流动分离及涡的形成,弦向流动会将主流区的水滴吸入边界层内,增大边界层内水滴的体积分数;三维旋转效应对水滴相流动及水滴收集率的影响在叶根附近较大,沿叶片展向方向的影响逐渐减弱。
In terms of the wind turbines blade icing,the water droplets collection efficiency is an important parameter.To research the water droplets collection efficiency on rotating blade of wind turbine influenced by three-dimensional rotation effect,the water droplets flow and impingement characteristics on the NREL Phase VI wind turbine were simulated based on the Eulerian two-phase flow method,and compared with the quasi-three-dimensional simulated results.Results show that at the same spanwise section,the three-dimensional rotation effect increases the maximum water droplets collection efficiency and the droplets impingement area on the suction surface,but the impingement area on the pressure surface is negligible.The spanwise flow on the blade surface extracts droplets from boundary layer along the spanwise direction,and suppresses the separation of the water droplets flow and the formation of vortexes.The chordwise flow draws the water droplets in the main flow into the boundary layer,increases the volume fraction of the water droplets in the boundary layer.The influence of water droplets phase flow and collection efficiency by three-dimensional rotation effect gradually decreases along the radial direction of the blade.
作者
周文平
汪异
杨茂立
Zhou Wenping;Wang Yi;Yang Maoli(The College of Physics and Electrical Engineering,Liupanshui Normal University,Liupanshui 553004,China;College of Intelligent Manufacturing and Automotive Engineering,Luzhou Vocational&Technical College,Luzhou 646000,China)
出处
《可再生能源》
CAS
CSCD
北大核心
2022年第9期1209-1214,共6页
Renewable Energy Resources
基金
四川省科技计划项目(2017JY0112)
贵州省普通高等学校青年科技人才成长项目(黔教合KY字[2019]133)
六盘水师范学院高层次人才科研启动基金项目(LPSSYKYJJ201816)。
关键词
风力机
三维旋转效应
欧拉法
水滴收集率
数值模拟
wind turbine
three-dimensional rotation effect
Eulerian two-phase method
droplets collection efficiency
numerical simulation
