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为提高Savonius风力机效率,提出一种基于多次Bezier曲线的Savonius风力机叶片设计新方法,通过调整设计公式中4个设计参数(叶片弦长L、叶片顶点偏向控制系数k_x、叶片顶点高度控制系数k_y、叶片头部宽度控制系数k_a)来修改叶片形状;结合CFD数值模拟、正交试验、响应面法分析得到最优风轮尺寸参数及其性能特点。研究结果表明:所提出的叶片优化设计方法适用于所有Savonius风力机,优化过程直观、便捷,优化结果准确;优化后风轮的风能利用系数、扭矩系数明显提高,且风速越低,提高越明显。风速为3.0 m/s时,风轮的最大CP值增大4.2倍,最大CM值增大3.7倍,优化后的风轮更适宜在低风速下运行。
In order to improve the efficiency of Savonius wind turbine, a new Savonius wind turbine blade design method based on multiple Bezier curves is proposed. By adjusting four design parameters (blade chord length L, blade vertex bias control coefficient k_x, blade vertex height control Coefficient k_y, blade head width control coefficient k_a) to modify the shape of the blade. Combining with CFD numerical simulation, orthogonal test and response surface analysis, the optimal rotor size parameters and their performance characteristics were obtained. The results show that the proposed blade optimization design method is suitable for all Savonius wind turbines, the optimization process is intuitive and convenient, and the optimization result is accurate. The wind energy utilization factor and torque coefficient of the optimized wind turbine are obviously improved, and the wind speed is lower, the more obvious the improvement . When the wind speed is 3.0 m / s, the maximum CP value of wind wheel increases by 4.2 times and the maximum CM value increases by 3.7 times. The optimized wind wheel is more suitable for operation under low wind speed.