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We study how an augmentation device, which consists of a diffuser and brim, affects wind turbine properties. An augmentation device enlarges wind speed, and the rotational speed of a blade put in it i...s increased. Tip speed ratio, which is defined by the wind speed at far upstream, becomes large. Equations, which relate the tip speed ratio and the power coefficient without the augmentation device to those with the augmentation device, are presented. The equations are experimentally examined. It is found that they give good prediction. A two-flow model is proposed for an augmentation device with short-length diffuser. The results of the two- flow model qualitatively agree with experiments.続きを見る
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