| This paper is mainly based on the national863projects,“the research of tidal currentenergy generation technology demonstration system”, which aims to make the design andanalysis method of the vertical axis tidal turbine accurate and reliable to predict theperformance. Therefore, the main work is to analyze the dynamic performance of three typesof tidal turbines simulations by model tests and numerical simulation method, which aresingle H-type fixed pitch vertical axis tidal turbine, double H-type fixed pitch vertical axistidal turbine and helical blades fixed pitch vertical axis tidal turbine.As the core component, the design of vertical axis turbine is the focus of the tidal powerstation. The advantages of single H-type fixed pitch vertical axis tidal turbine are simple andreliable structure, reliable operation, and low cost manufacturing. So it has become widelyaccepted. However, it has higher operating tip speed ratio, the load of blade is very large, theforce of turbine axis has great fluctuation, and the turbine has no capacity of self-start. So thepaper presents two type tidal turbines, which are double H-type fixed pitch vertical axis tidalturbine and helical blades fixed pitch vertical axis tidal turbine. Two types of tidal turbinescan be effective in reducing the blade load and force fluctuation, and have high energyefficiency.The data obtained by the model test is limited, so the analysis of performance parametersof tidal turbine is mainly by a large number of CFD numerical simulations. The paperanalyzes the impact of turbine parameters such as tip speed ratio, blade fixed axis and fixedpitch, blade airfoil, solidity, stream velocity, blade length, impeller phase angle and bladehelix angle, and so on. Compare the results of model test and numerical simulation, andanalyze the reasons for differences. Finally, compare the performances of three turbines, andprovide theoretical methods and design techniques for the design of tidal current energydevices. |
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