Abstract
A ducted Darrieus-type turbine has been proposed for extra-low head hydropower utilization of total head less than 2m. Though the hydro turbine system, in general, consists of an intake, runner section and draft tube for higher efficiency operation, it was clarified in previous experiment that there was no need of a draft-tube and the side-walls of runner section for keeping the performance high, provided with nozzle at the inlet, which yields a simplification of the structure of the turbine system. In order to further simplify the structure, the effects of upper-wall of runner section and water levels of downstream pond on turbine performance were experimentally investigated. In the present paper, the experimental results are shown with various water levels of downstream pond.
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