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박다인 ( Da-in Bak ),이상호 ( Sang-ho Lee ),이상설 ( Sang-seol Lee ) 한국환경기술학회 2021 한국환경기술학회지 Vol.22 No.1
Experimental analysis has been carried out to investigate the seawater flow fields and turbine output characteristics of vertical dual channels in a tidal current power generation system. The turbine outputs such as rotational speed and power generation of the dual channel blades are severely affected by the seawater flow field and the electrical load of the generator. Compact scale model by 3D printing method with the dual channel turbines were constructed in a water tank test device, and the rotational speed and power output of the turbines at the upper and lower channels were compared for various inlet flow velocities and electric loads. Axial flow velocity was decreased as it approached the entrance of the dual channel turbine system while the velocity for the upper channel was relatively lower than that for the lower channel. This results in relatively high rpm speed and power output of the turbine in the lower channel due to flow momentum and blade torque. The speed was also increased with the electrical load of the axially connected generator for less than 200Ω, and it was a little lower for upper channel. The generation efficiency gradually increased with the tip speed ratio, and then decreases after the peak while it depends on the inlet flow velocity. It is expected that these results can be used as applicable design data for the development of the multi-channel tidal power generation system.