螺旋形S型垂直轴风轮结构优化设计

Optimum Figuration of Helix S-Type Vertical Axis Wind Tubine

提出了扭角180°的两叶片螺旋形S型风轮,采用k-ε数学模型从偏心系数G、封盖直径D0、内隔板数N、螺距P4个关键结构参数,对其结构进行优化设计。结果显示:当G=0.19或封盖直径与风轮直径比(D0/D=1.1)或N=6或P=6.0时,风轮性能分别达最佳;当G=0.19、D0/D=1.1、N=6和P=6.0时,螺旋形S风轮的风能利用率,在叶尖速比0.75时达0.21。对试验工况进行模拟,试验值与计算值吻合良好,说明计算值可信。

A helix S-type rotor with two blades and 180 degree helical angle was put forward. A three dimensional k-ε model was applied to optimize the rotor configuration, from four key rotor shape factors, such as overlap ratio（G）, diameter of endplates（D0）, number of inner plates within buckets（N） and pitch（P）. The results from the model show that the rotors get the best performances respectively when G =0.19, or P =6.0, or Do is 1.1 times bigger than diameter of the rotor, or N=6. The maximum coefficient of rotor power reaches 0.21 with tip speed ratio 0.75 when G=0.19, P=6.0, D0/D=1.1 and N=6. Model results are agreed fairly well with the experimental results, this proves that the results got from model is credible.