针对现有垂直轴风力机流管模型中未经充分实验验证的流管假设,提出了一种针对垂直轴风力机的空气动力模型——双盘面随动流管模型.模型整体采用双盘面单流管模型,局部采用随动流管模型,同时考虑了叶片的动态失速效应,并结合了Gormont动态失速模型.其中,双盘面单流管模型假设风轮的上下盘面均具有各自恒定的来流风速；随动流管模型假设叶片的相对局部风场中存在随动流管,流管方向与叶片相对风速方向一致,并随叶片实时运动.在Matlab中建立了模型并进行了系统计算,通过与实验数据的对比分析发现,该模型可较好地预测风力机的整体气动性能.同时研究结果表明:为了较准确地预测风力机在低尖速比范围内的气动性能,动态失速效应是不可忽略的.%In multiple stream tube model for vertical axis wind turbine, stream tube assumption does not agree with the real flow and has not been validated by experimental data. This paper presents an aerodynamic model for vertical axis wind turbine, called double-disks moving-stream tube model. In this model, Double-disks Single-stream tube model (DDSM) and moving-stream tube model (MSM) were combined, where as the former acts as a macro-model and the latter acts as a micromodel. The Gormont model was also introduced, in considering the dynamic stall effect. It was assumed in the DDSM model that the rotor had been divided into two disks along the wind direction and each disk had a constant speed for inflow at any azimuth angle. Whereas, MSM assumed that there already existed a moving stream tube in the relatively local flow field of blade, which had a consistent direction of relative wind speed of blade and kept moving with the blade. After building the model in Matlab, performance of a prototype in Sandia national laboratory was then calculated. When comparing the experimental data, it was discovered that this model can predict the whole aerodynamic performance well, and the dynamic stall effect cannot be neglected for accurate prediction at low tip speed ratios.
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