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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/94496

    Title: 垂直軸風機流場之數值模擬
    Other Titles: Numerical simulation of the flow field of vertical-axis wind turbines
    Authors: 楊旭霖;Yang, Shiu-lin
    Contributors: 淡江大學航空太空工程學系碩士班
    Keywords: 垂直軸風車;風力發電;Vertical-Axis Wind Turbines (VAWT);FLUENT;Wind energy
    Date: 2013
    Issue Date: 2014-01-23 14:42:39 (UTC+8)
    Abstract: 本研究利用FLUENT計算流力軟體來模擬垂直軸風車之流場,求解三維非穩態不可壓縮紊流的Navier-Stokes方程式。
    本文裡有利用二維計算三種不同直徑的垂直軸風車,採用k-ε standard模式計算在不同尖速比下的扭力,其結果與實驗所得趨勢吻合,誤差在20%。
    This study used the commercial CFD software, FLUENT, to simulate the flow field of VAWTs. The governing equations are the two-dimensional, unsteady, incompressible, turbulent Navier-Stokes equations.
    The results show that the residual values should be set small enough to allow at least 200 iterations within a time step in order to obtain a converged solution. This is due to the highly unsteady and turbulent flow of VAWTs. The time step can be set larger to speed up the calculation if 200 iterations requirement is satisfied.
    The performance data of three small VAWTs were also measured in a low speed wind tunnel to validate the numerical results. The discrepancy between experimental and two-dimensional numerical results is about 20%. The trends of the performance curves predicted numerically match that obtained experimentally. Three-dimensional effects need to be further investigated. A two-dimensional simulation takes about 12 hours in a desk top computer with an Intel-I7 cpu. But a corresponding three-dimensional simulation takes about 8 days. Therefore, two- dimensional simulation is a good preliminary design tool.
    Our study also demonstrates that different turbulence models affect the numerical results significantly. The application of turbulence models in VAWTs need to be investigated extensively.
    Appears in Collections:[航空太空工程學系暨研究所] 學位論文

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