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Numerical Simulation On Flow Field Of Vertical-axis Variable-pitch Turbine

Posted on:2011-08-21Degree:MasterType:Thesis
Country:ChinaCandidate:L JiaoFull Text:PDF
GTID:2120330332459834Subject:Fluid Mechanics
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Nowadays every country in the world are confronting with the shortage of energy. Wind energy and hydropower for their remarkable characters of renewable energy, no pollution, widely distribution, steady and so on have become one of the most important energy attracting researching of people. Therefore, the exploition and use have become one of the most noticeable researches in the world. The conversion of hydropower/wind energy is becoming one of the important factors in the exploition or use of hydropower/wind energy, thus the pattern of the equipments and their power performance of hydro-kinetic force which is very important in our study is becoming the core technology of the conversion of hydropower/wind energy.This thesis is mainly to calculate the dynamic performance of swing-type device and vertical-axis variable-pitch turbine for the conversion of hydropower/wind energy.Firstly , CFD software FLUENT is adopted to make two-dimension numerical simulation of unsteady flow. Using independence programming combined with the function of the popular computational fluid dynamics software FLUENT, which can deal with the moving mesh of moving borderline, therefore, the dynamic performance of swing-type device is simulated, and then calculate the dynamic hydrodynamic force performance of two-dimension aerofoil, and we discussed the influences of the interference between the wings to the dynamic performance of swing-type device.Secondly,mathematical model basing on single-stream tube model combined with the equation of the blade motion is presented to calculate the hydrodynamic performance of the swing-type device. We discussed the influences of some parameters to the hydrodynamics performance of the turbine,including initial swing angle, the speed of stream and the compactness .Finally,the numerical simulation of blades from a vertical-axis variable-pitch turbine was given in this thesis. According to the balanced force equation and balanced torque equation of blade, compiling UDF processing, and using FLUENT combined with user defined function(UDF), and the combined method of sliding grid and moving mesh, the vertical-axis tidal-current turbine with inertial force system is simulated. We ultimately studied the fleet angle movement law of blade and the power efficiency characteristics of turbine.
Keywords/Search Tags:the dynamic performance of swing-type device, passive angle modulation of vertical-axis variable-pitch turbine, power performance, moving mesh, stream tube method, the numerical simulation with inertial force system hydrodynamic force
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