College of Engineering,Ocean University of China,Qingdao,China
海上浮式风电快速发展,垂直轴风力发电机(VAWT)结构简单、重心较低,在深远海网箱自供能等领域更具有开发潜力。VAWT构造远不同于水平轴风机(HAWT),风场阵列各机组相互影响规律不清,水平轴风机阵列工程经验难以直接应用。针对H型垂直轴风力发电机,通过CFD模拟,将翼型设计与涡轮阵列相关联,对比分析多种翼型及不同阵列条件下垂直轴风机的转矩系数 、功率系数 及平均功率参数Ω：非对称翼型相较于对称翼型在高叶尖速比下功率系数较低,弯度效应能显著提高翼型在下风区的功率系数；风场阵列中,三涡轮阵列优化后下风区涡轮功率显著提升,单涡轮功率可提升40%,风场整体功率提升约20%,针对海上牧场结构平面提出了五个涡轮阵列,优化后风场整体效率提升了65%,单涡轮性能提升可达100%。以上研究成果对于提高深远海网箱系统功能与设计具有推动意义。
With the rapid development of offshore floating wind power, the vertical axis wind turbine[VAWT] has a simple structure and a low center of gravity, which has more potential for development in the field of far-reaching sea cage self-power supply. The structure of VAWT is far different from that of horizontal axis wind turbine[HAWT), and the interaction law of each unit of wind farm array is not clear, so the experience of horizontal axis turbine array engineering is difficult to be directly applied. In this paper, for H-type vertical axis wind turbine, through CFD simulation, the airfoil design is associated with turbine array, and the torque coefficient CM, power coefficient CP and average power parameter Ω of vertical axis turbine under various airfoils and different array conditions are compared and analyzed. The power coefficient of asymmetric airfoil is lower than that of symmetrical airfoil at high tip speed ratio, and the bending effect can significantly improve the power coefficient of the airfoil in downwind region. In the wind farm array, after the optimization of the three-turbine array, the turbine power in the downwind zone can be significantly increased, the single turbine power can be increased by 40%, and the overall wind farm power can be increased by about 20%. Five turbine arrays are proposed for the structural plane of the sea pasture. After the optimization, the overall efficiency of the wind farm can be increased by 65%, and the performance of the single turbine can be improved by 100%. The above research results have promoting significance for improving the function and design of far-reaching Marine cage system.