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We are under obligation to coexist with natural ecosystem, for the next leap in the hydroelectric power development. In such circumstances, the authors have proposed the new type hydraulic turbine, named “Gyro-Type Hydraulic Turbine”, composed of some blades with high aspect ratio and the rotor is submerged nearly parallel to the stream. The turbine is suitable for shallow streams with high velocity in mountain torrents and/or rivers. This paper, continuously, discusses the flow conditions around the rotating blade using the flow visualizations by PIV and the numerical simulations by CFD. The visualizations and the simulations proved that the self-motive power is generated by the drag force of the blade facing to the downstream. With the increase of the rotational speed, however, the rotational torque comes to be caused by the lift force of the blade not only facing to the upstream but also facing to the downstream, and the maximum torque/output is at the higher rotational speed.

Development of Gyro-Type Hydraulic Turbine Suitable for Shallow Stream (2nd Report, Flow Conditions and Rotor Works)