Abstract
The Darrieus-type cross-flow turbine, set in the duct casing, has been proposed for utilizing water generation at low head site in rivers and conduits. A weir existing anywhere in river might be replaced with this turbine system, flow passage of which consists of an intake, the runner section and a draft tube. Influences of runner casing geometries and draft tubes with various diverging angles on the turbine efficiency, that is a ratio of the generating power to supplied water head power, were investigated experimentally. In the present paper, measured velocity profiles in the passage are shown and preferable geometries of the casing and draft tube are discussed for effectively utilizing low head water power. And finally guiding principles for its design with efficiency of 57%, is demonstrated with useful data.
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