Abstract
We have proposed an axial flow hydraulic turbine with a collection device, using water flow energy of open channel. In this study, we investigate the flow field around the hydraulic turbine by numerical analysis in consideration of free surface and PIV measurement with water tunnel. As the result, it showed the validity of the analysis because the calculated values and experimental values were in good agreement. There are the formations of large-scale vortex behind the brim of hydraulic turbine. In addition, there are separation vortex regions near the inner wall of the collection device. The separation vortex regions become larger with increasing rotational speed. Therefore, the diffuser pressure recovery decreases and inlet velocity ratio becomes lower with increasing rotational speed.
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