Internal Flow in Gyro-Type Hydraulic Turbine to Coexist with Natural Ecosystem

Abstract

We are under obligation to coexist with natural ecosystem, for the next leap in hydroelectric power developments. In such circumstances, this paper proposes a new type hydraulic turbine, named "Gyro-Type Hydraulic Turbine", accompanying with the flow visualizations by PIV and the numerical simulations by CFD around the blades in the rotating conditions. At low rotational speed, the most of the rotational torque is generated by the lift force of the blade facing to the upstream. On the other hand, at high rotational speed, the torque comes to be caused by the lift force of the blade not only facing to the upstream but also facing to the downstream.