A Study on the Analytical Methods for the Aerodynamic Characteristics of Vertical-Axis Darrieus Wind Turbine

수직축(垂直軸) Darrieus 풍력(風力) 터어빈의 공기역학적특성(空氣力學的特性) 해석(解析)에 관한 연구(硏究)

Performances of 3 different aerodynamic analytical models, single multiple and double multiple stream tube, for vertical axis Darrieus turbine were analyzed comparatively. From the study it has been found that the models derived from stream tube assumptions can be useful for simple prediction of basic design characteristics of Darrieus turbine. But, for a large tip speed and solidity ratios, the models has shown a certain limit in its applicability according to the formulation scheme applied. The results have shown that for the case having large tip speed and solidity ratios the consideration due to stream conditions, such as trailing vortices or wakes, should be included for accurate prediction of the aerodynamic performances of Darrieus turbine.