To estimate the blade performance of a Darrieus-type cross-flow water turbine, differences between the characteristics of a Darrieus blade which moves along a circular path, and that of the blade at rest in a uniform steady flow are examined quantitatively by use of experimental data for three types of blades with different cambers or chord lengths from each other. It is found that a unique stall character strongly effects the drag force acting on the Darrieus blade. A model of the changing pattern of the drag coefficient by a dynamic stall is proposed from the results of measurement for estimating the blade characteristics. As the results, the blade characteristics and performances of the Darrieus-type runner are predicted well by the use of aerofoil data in a uniform steady flow and taking into account the effect of a circular motion, and the dynamic effect of the unsteady flow around the Darrieus blade.
|Title of host publication||Memoirs of the Kyushu University, Faculty of Engineering|
|Publisher||Publ by Kyushu Univ|
|Number of pages||14|
|Publication status||Published - Jun 1992|
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