Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 19, 2024 - November 20, 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. In addition, a volute was employed to inject pre-swirl into the front rotor. In this study, a small flow rate turbine with a design flow rate of 3l/s was designed, but its efficiency is lower than that of larger turbines. In order to investigate the cause of this low efficiency, a numerical analysis was conducted focusing on the clearance behind the main plate.
