A two dimensional Darrieus-type turbine with a vertical shaft, in dammed extra-low head waterway, has been proposed.
As a flow rate in the waterway is varied temporally and seasonally in the practical use, it should be considered at the design
stage to avoid the flooding from the waterway and to squeeze the hydropower effectively even at low flow rates. In the present
paper, while useful data for a high performance design, based on the present stage of authors' experimental investigation
are shown, how to select key parameters of the turbine geometry such as a Darrieus turbine diameter, a blade spanlength
and a weir-height in the turbine section is at first demonstrated against the waterway with a rectangular section.
Secondly the effective operations will be discussed for various flow rate conditions by an adjustment of an inlet nozzle
height.
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