Modification And Research Of Flange Reversible Marine Current Turbine

Marine current energy is a renewable clean energy, which reservation is huge,predicable and have less impact on the human living environment and marine animals.The horizontal axis marine current turbine is widely used for its smoothly running, good stability and high efficiency. It includes three forms: windmill, hollow and diffuser. This paper focused on the diffuser-type horizontal axis marine current turbine, namely the flange reversible marine current turbine.Flange Reversible Marine Current Turbine is a new type of axial flow structure. This paper explored the matching problem of blade structure and diffuser, realizing high bidirectional efficient operation. However, the research in this area was too less. Based on the design of both, as well as combining numerical optimization with test method, this article analyzed the hydrodynamic and structural performance.(1)Combined with the development of world energy, this paper summarized the research status of marine current turbine at home and abroad, as well as its capture type and performance analysis method. Afterwards, it proposed the main research content and technical route.(2)Based on the theory of wind turbine, this article introduced the airfoil theory,blade element- momentum theory and blade design methods of marine current turbine;modified the blade model by the use of Wilson method, Matlab software and fmincon polynomial, chose the bidirectional circular divergent diffuser as the initial design parameters, using the Pro / E software to establish three-dimensional model of the machine; using the CFD and BEM method, simulated its hydrodynamic performance through steady simulation; analyzed the diffuser's influence on capture coefficient and pressure distribution, then verified the results reliability by experiments; With the optimization goal of capture coefficient, made the geometric parameters of blades and diffuser as design variables, adjusted the diffuser's geometry through single variablemethod, while linearly and setting value adjusted the blade twist angle, analyzed the structural parameters impact on the hydrodynamic performance, searched the optimal model in a large area and optimized it at end.( 3) By the use of Workbench platform, this paper analyzed the one-way fluid-structure-interaction of blade at a certain range of tip speed ratio, obtained its stress and strain distribution in different conditions, and judged its strength and stiffness met the requirements or not, which provided an important reference to the blade design.