The Analysis Of Fluid-Structure Interaction On Horizontal Axis Tidal Current Impeller

Along with exhausting of the traditional fossil energy,the use of renewable clean energy has become an urgent demand for the development of all countries.As a kind of new green energy,tidal power become the focus of the study.The horizontal axis turbine is a main kind of tidal current energy conversion device.With the improvement of technology,large-scale turbine has become the trend of development,the increasingly larger turbine will bring a series of problems,such as the cavitation of blade and the hydroelasticity.In this paper,for the horizontal axis tidal current turbine,studies were made on the hydrodynamic performance and structural performance,based on the theory of viscous fluid mechanics and structural finite element theory,using the method of one-way and two-way fluid solid coupling(FSI),combined with volume of fluid(VOF)multiphase flow model;apart from this,a kind of composite material blade of turbine with bend-twist coupling was designed and improved,based on the mechanics of composites and the bend-twist theory.This paper will provide references for the prediction of the performance of horizontal axis tidal current turbine and the design of blade.The following researches were carried out in this paper.Based on the method of numerical simulation of CFD,combined with the VOF model and the theory of free surface wave,making simulation of the hydrodynamic performance and cavitation characteristics of the horizontal axis tidal current turbine,simulating the formation and development of the sheet cavitation on the surface of the blade of turbine,discussing the main factors affecting the cavitation,and analysing the effect law of the cavitation on turbine performance.On the basis of the numerical simulation of CFD,according to the structural finite element theory,using the method of one-way and two-way FSI,analysing the hydrodynamic and structural performance and the coupling law of tidal power turbine,through comparing the result,discussing the advantage and disadvantage the two method on the prediction of the turbine performance.According to the mechanics of composites and the bend-twist theory,a kind of adaptive composite material blade with bend-twist coupling was designed,through the method of multi variable and multi objectives,the installation angle of blade and ply fiber thickness were optimized,the performance of hydrodynamics and structural and the cost of construction were optimal coordination,and two-way FSI were analyzed after optimization,the results showed that the blade after optimized would have better hydrodynamic and structural performance.