双风轮  ; 数值计算  ; 增功现象  ; 气动分析  ; 流场分析

将NH1500kW风力机作为原模型,在其(主风轮)前安装同轴同向同转速旋转的小风轮(副风轮)得到双风轮风力机。设计直径为26 m,叶片数依次为8～12的副风轮,得到五种双风轮模型。对以上六种模型进行不同工况下的气动分析,结果表明：双风轮风力机可以增大风能利用率,副风轮叶片数为10的双风轮风力机增功效果最佳,风速为3 m/s时,效果最为显著。相较于原风力机，其功率增大了14.17%，风能利用系数提高了4.53%，相较于单独运行的两风轮，其功率增大了0.47%，风能利用系数提高了1.74%；双风轮风力机的主风轮靠近叶根部分(半径小于13 m)来流风速相对减小,副风轮叶尖部分(半径约在13～20 m)来流风速相对增大；副风轮转化了部分能量,使尾流中的动能明显降低。

dual-wind turbine  ; numerical calculation  ; augmentation phenomenon  ; pneumatic analysis  ; flow field analysis

Using NH1500kW wind turbine as original model. Installing a small wind turbine (auxiliary wind wheel) that having the same rotary axis、direction and rotating speed with NH1500kW model in front of the original model (main wind wheel) obtain dual-wind turbine. Designing auxiliary wind wheel with a diameter of 26 m and a number of blades of 8～12 in turn, then five types of dual-wind turbine models were obtained. The aerodynamic analysis of six models under different working conditions shows that the dual-wind turbines can increase wind energy utilization. Dual-wind turbine with 10 blades auxiliary wind wheel has the best effect. When the wind speed is 3 m/s, the double wind turbines have the most significant gains. Compared with original model, its power increased by 14.17%, the wind energy utilization factor increased by 4.53%, Compared with two wind wheels running separately, its power increased by 0.47%, the wind energy utilization factor increased by1.74%. Parts of the wind speed that closed to the blade root of the main wind wheel (radius less than 13 m) is relatively reduced, closed to the tip of auxiliary wind wheel (radius is about 13～20 m), the wind speed is relatively increased. The auxiliary wind wheel converted part of energy, so the kinetic energy in the wake is significantly reduced.

TK83

国家国际科技合作专项项目大型风力机风轮关键技术研究及示范(2014DFR60990)