English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 52047/87178 (60%)
造訪人次 : 8705307      線上人數 : 184
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜尋範圍 查詢小技巧:
  • 您可在西文檢索詞彙前後加上"雙引號",以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋,建議至進階搜尋限定作者欄位,可獲得較完整資料
  • 進階搜尋
    請使用永久網址來引用或連結此文件: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/102641


    題名: 阻力型垂直軸風機流場之數值模擬
    其他題名: Numerical simulation of the flow field of drag type vertical-axis wind turbines
    作者: 陳思瑜;Chen, Szu-Yu
    貢獻者: 淡江大學航空太空工程學系碩士班
    陳慶祥
    關鍵詞: 阻力型垂直軸風車;風力發電;Drag type vertical-axis wind turbines;FLUENT;wind power generation
    日期: 2014
    上傳時間: 2015-05-04 10:00:49 (UTC+8)
    摘要: 本研究利用FLUENT計算流力軟體來模擬阻力型垂直軸風車之流場,求解二維非穩態不可壓縮紊流的Navier-Stokes方程式,並與實驗數據進行比對。
    先利用Gambit繪製外型以及建構非結構網格且給定邊界條件,從圓柱的模擬開始,了解FLUENT對於此種外型的計算能力何在,接者透過使用不同紊流模式流經單一C型葉片,驗證何種模式為此幾何外型最適用的紊流模式,最後進行兩組阻力型垂直軸風車之模擬,第一組為兩葉片C型轉子加上分別為四片、六片以及八片所組成的導風罩,第二組則為六葉片C型轉子加上以四片、六片組成的導風罩進行模擬,計算風機的流場以及平均力矩。
    得到之結果為,不同的紊流模式對於得出之結果影響甚鉅,因此在紊流的使用上仍有許多不足且需要探討的地方。而與實驗數據的比對,整體趨勢大致與實驗相符,流場向量圖符合物理現象,於低轉速高力矩時得到的值誤差大約10%~20%,尚在接受範圍,然而高轉速低力矩時則與實驗值大相逕庭,可能是由於數值結果並未包含風車系統的摩擦阻抗。
    This study used the commercial CFD software, FLUENT, to simulate the flow field of drag type VAWTs and compare the numerical results with the experimental data. The governing equations are the two-dimensional, unsteady, incompressible, turbulent Navier-Stokes equations.
    This work were divided into three parts. Part 1 simulated the flow passing a circular cylinder with various Reynolds numbers to understand the predicting capability of FLUENT. Part 2 simulated the flow passing a single c-type blade subject to different turbulent models to find the applicability of turbulent model for such flows. Part 3 simulated the flow field of drag type VAWTs to obtain the average torque and power.
    The results show that different turbulence models affect the numerical results significantly. The applicability of turbulence models in VAWTs need to be investigated extensively. The trends of the performance curves predicted numerically match that obtained experimentally.
    The discrepancy between experimental and numerical results is about 10-20% when the rotational speed of turbines is lower and the torque is higher. The discrepancy is much larger when the rotational speed is high and the torque is low. This may be due to the resistance from the wind turbine system, which was not included in the numerical results.
    顯示於類別:[航空太空工程學系暨研究所] 學位論文

    文件中的檔案:

    檔案 大小格式瀏覽次數
    index.html0KbHTML113檢視/開啟

    在機構典藏中所有的資料項目都受到原著作權保護.

    TAIR相關文章

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - 回饋