Abstract
A hydraulic turbine for an open channel can generate power at low head and doesn't affect the environment because it doesn't have incidental equipment. However, because the rotational speed is low, the hydraulic turbine outer diameter becomes large. Therefore, we proposed an axial flow hydraulic turbine with collection device, using kinetic energy of open channel flow. The analysis performances and flow fields of runner only, collection device only and combination of runner and collection device were clarified. However, open channel flow has a free surface, so it is not sufficient for the analysis so far assuming uniform flow into the hydraulic turbine, which is installed in a wide space. In this study, for the purpose of evaluating the quantitative performance characteristics of this hydraulic turbine, we conducted performance tests and PIV measurements of the flow field around the hydraulic turbine.
