Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : June 17, 2024 - June 18, 2024
In order to develop an in-line small hydroturbine that can generate 300W at a small flow rate of 3l/s, we adopted a contra-rotating rotors to achieve both miniaturization and high efficiency of our hydroturbine in this study. A centrifugal rotor that can be applied to small flow rates and high heads is used for a front rotor, and a hybrid rotor that combines a mixed flow rotor and an axial flow rotor is used for the rear rotors with the propose of recovering the same head as the front rotor. The performance of the front rotor was greatly improved by providing a pre-swirl by a volute, and the target performance was achieved. In this study, an experimental apparatus was constructed to understand the performance of the actual model, and a numerical flow analysis was conducted focusing on the exit angle and tip clearance of the front rotor to increase the swirl flow into the rear rotor.
