计及动态失速和有限展弦比的立轴风力机气动分析

Aerodynamic Performance Prediction for Darrieus Wind Turbine in View of Dynamic Stall and Finite Aspect Ratio Effects

结合Darrieus立轴风力机运行时叶片非定常气动特性,对B-L动态失速模型进行了适当修正。考虑叶片有限展弦比效应和叶尖气动损失,修正了等截面叶片的气动性能。基于DMST气动评价方法,给出了考虑动态失速和有限展弦比效应的Darrieus立轴风力机气动性能计算模型。对Sandia实验室17 m风力机进行了气动评价,分析了动态失速与有限展弦比对叶片气动特性的影响,与实测的功率和功率系数的对比表明,该模型能较好地预测Darrieus立轴风力机的气动性能。

Considering the unsteady aerodynamic characteristics of the vertical axis wind turbine（VAWT） blade at low speed ratios,the B-L dynamic stall model was modified.The finite aspect ratio effects and blade tip loss were taken into account to modify the aerodynamic characteristics for constant chord blade.Based on the double-multiple stream tube method（DMST） in aerodynamic analysis,an improved aerodynamic performance prediction model for VAWT was developed combining with the dynamic stall model and predicting method for the effects of finite aspect ratio.The aerodynamic performance of 17 m VAWT by Sandia National Laboratory was calculated.The effects of the dynamic stall and finite aspect ratios were analyzed,and the rotor power and power coefficients were compared and analyzed between the test and evaluation results.Feasibility of the prediction model to evaluate the aerodynamic performance for VAWT was proved.