The Study Of Blade Design And Experiment Of Horizontal Axil Turbine

On earth, the reserve of traditional fossil energy such as oil and coal is extremely rich.Since the industrial revolution, Fossil energy powered the rapid development of society. At the same time fossil fuel resources are facing the danger of depletion and cause serious effects on the environment. Ocean energy is a new clean energy and there is rich in ocean energy because the sea covers 71% of the earth’s surface area. People pay more and more attention on how to extract energy from ocean energy, nowadays, it is an established technology that tidal current energy be used to generate electricity, tidal current energy is a kind of renewable energy and it is predictable, non-polluting, periodicity and doesn’t account for resources of the land. Our country has a long coastline and rich in resources of tidal current energy, the optimum use of resource of tidal current energy is of great importance to develop the socialist road with Chinese characteristics. Tidal power is a process that converts the kinetic energy of the sea into electrical energy. And the blades are an important part of horizontal axis tidal current energy turbine. So the design of blades is of great significance to efficiency and stability of tidal current energy device.This paper made a summary on the present situation and development trend of tidal power technology at home and abroad. By using the method to design blade of tidal current power device, based on the hydrofoil theory and Schmitz theory, in which loss of the rotation of the blades is considered, from the method of comparisons between pressure coefficient and cavitation coefficient to improve cavitation performance of blade. Section pith angle and chord length were calculated by using MATLAB and XFOIL, the 2D coordinates been turn into 3D coordinates by following the principle of coordinate’s transformation. Geometry model was created by Pro/E of 3D design program-Solidwork S,making of blade on the basis of 3D model.Through the study of blade design method and experiment, getting a better understanding of the performance of the blade of tidal current power device that if the relative camber of hydrofoil is greater and the relative thickness of hydrofoil is smaller than the blades are more efficient; In the case of low velocity and small tip speed ratio, the cavitation phenomenon is unlikely to happen; The more the numbers of blade, tip speed ratio will be reduced and blades has a better starting performance. The study of this article can provide some theoretical references for the research group and other researchers on the design of tidal current power device or the application in engineering.