主催: 一般社団法人 日本機械学会
会議名: 第26回 動力・エネルギー技術シンポジウム
開催日: 2022/07/13 - 2022/07/14
In this study, a tidal current energy is focused in ocean-based renewable energies. Collecting a tidal flow is very important because it is generally known that a power available from a stream of water is proportional to the cube of the free stream velocity of the current. In this research, a bi-directional turbine system is investigated for a tidal flow that changes the direction periodically. Numerical investigations are conducted on a bi-directional spiral flow collector which has 1.8 times larger maximum diameter than the turbine diameter. Calculated results showed that the collector with eight guide vanes was the highest angular moment at turbine inlet. The axial velocity at turbine inlet was larger for smaller value of the vane skew angle, whereas the tangential velocity at the turbine inlet was larger for larger value of the vane skew angle. As the results of both the profiles of axial and tangential velocity, the angular moment took the local maximum value at around the angle of 180 deg. in this study.
