Numerical Simulation Of Coupled Motion Of Fluid And Solid About Passive Vertical-axis Variable-Pitch Turbine

KOBOLD tidal-current turbine and spring-control vertical-axis variable-pitch turbine are two kinds of representative passive variable-pitch turbines. In this thesis, the main content is the prediction of hydrodynamic performance of these two kinds of turbines with numerical calculation methods. Much attention is focused on the comparison and studying of hydrodynamic performance of different parameters of the turbine. All of these are the important bases of the selection of turbine, the design of hydrodynamic performance, and the general design of marine tidal-currents energy plant.Mathematical model basing on double-disk multi-streamtube methodcombined with the equation of the blade motion are presented to calculate the hydrodynamic performance of the KOBOLD vertical-axis variable-pitch turbine. We discussed the influences of solidity, the position of blade shaft, and blade angle areas on the energy conversion coefficient of the KOBOLD vertical-axis variable-pitch turbine.Using the popular computational fluid dynamics software FLUENT combined with user defined function to solve the issue of fluid-solid coupling proved to be feasible by two simple examples ,FLUENT is used to calculate the hydrodynamic performance of spring-control vertical-axis variable-pitch turbine, and then compared with the experimental data. We particularly analyzed the kinetic rules of the blade and the relation between force of the blade attack and zimuth angle.then we discussed the influences of spring rate, blade angle areas on the energy conversion coefficient of spring-control vertical-axis variable-pitch turbine.At the end of the thesis,we proved that using FLUENT combined with the software ADAMS to solve the issue of fluid-solid coupling is feasible by one easy example.