基于计算流体动力学的S型风力机性能分析

Evaluation of performance of Savonius rotors based on computational fluid dynamics

以单位宽度功率为指标,采用标准k-ε湍流模型及SIMPLE算法,研究叶片高度对S型风力机性能的影响.从等过风面积和等直径2种工况出发,选取4个不同系列的高径比α,对风力机进行三维数值模拟.模拟结果与根据L-σ准则提出的从增加叶片高度来提高风力机单位宽度功率的可行方案吻合;同时得出,当α=6时,风力机性能最优.

The standard k-ε turbulent model and SIMPLE algorithm were employed to study the influence of blade height on the performance of Savonius rotors using the index of power per unit width. 3D numerical simulations of the rotors under two different conditions of the same wind area and the same blade diameter were performed by selecting four different height-diameter ratios of blades. The simulated results suport the feasible scheme of increasing of blade height in order to improve the power per unit width of rotors according to the L-σ criterion. The capacity of the rotors is greatest when the height-diameter ratio is 6.