Abstract
The aim of this study is to develop an ultralow-head water turbine for an open channel,such as an irrigation channel,in order to effectively use hitherto unused hydropower energies.By focusing on a cross-flow runner,we eliminated the casing and used the application as a water turbine(undershot-type cross-flow water turbine) for an open channel.We investigated the effect of flow rate on the internal flow of the water turbine by an experiment and a CFD analysis.As a result,the following facts became clear.At a large flow rate,water region is wide at the outer and inner circumference of a runner.Moreover,the influence that a shock loss gives to water turbine efficiency is large.
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