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Conceptual design of a very low head double effect bulb hydro turbine blade
Quang Huy Nguyen(응웬광휘),Ujjwal Shrestha(쉬레스트 우즈왈),Young-Do Choi(최영도) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.8
Seventy-one percent of the Earth’s surface is covered by sea with an enormous source of renewable energy, including tidal energy, marine current energy, wave energy, ocean thermal energy, salinity gradient energy. The tidal energy is a form of hydroelectric generation base on the change of sea level caused by the gravitational effect of the moon and sun on the ocean. The flood and ebb tides allow the water to rush into, and out. The flow of water generates enough power to rotate the turbines to create electricity. However, there exist some barriers to design the turbine such as variation of head and flow rate. Therefore, the bulb turbine type are the best adapted for the tidal power plant because of wide operating rage with relatively high efficiency. The design method is based on the lifting method. By using CFD analysis (ANSYS CFX), with the normal direction flow, the bulb turbine can reach 83.53% of efficiency at design point and 85.87% of efficiency at best efficiency point (BEP), with the inverse direction flow, the bulb turbine can reach 64% of efficiency at design point and 74.59% of efficiency at the BEP. [그림 본문 참조]