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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/84789


    Title: 具外罩小型風力機流場之數值模擬
    Other Titles: Numerical Simulation ofthe Flow Field of Small Wind Turbines with Diffuser
    Authors: 陳慶祥;劉欣怡
    Contributors: 淡江大學航空太空工程學系
    Keywords: 外罩;風力機;數值模擬;diffuser;wind turbine;numerical simulation
    Date: 2010
    Issue Date: 2013-03-22 19:38:36 (UTC+8)
    Publisher: 臺北縣淡水鎮 : 淡江大學航空太空工程學系
    Abstract: 本研究探討小型風力機加入外罩後流場的變化,為了暸解不同型式的外單產生的效能,一開始先與實
    驗值互相驗證無外罩的風力機,再探討加入外罩和無外罩的風力機流場分佈與效能,當風力機加上外
    罩後,得到的風速變大,最後得到的效能也較好。影響外罩的參數有擴散器的長度(L) 、入口直徑(D) 、
    擴張的角度(θ) 以及外緣的長度(T) ,本研究選用外緣伸長的長度、擴散器出口與中心軸的距離和
    後段據散器的擴散角度來分析。研究與結果顯示,外緣伸長的長度有決定性的效果,且當外緣伸長的
    越長,得到的效能也較好。擴散器出口與中心軸的距離則必須具有一定長度,若太短或太長皆無法得
    到好的效能。最後,後段擴散器的擴散角度至少要在14 度以上才能得到好的效能。
    The aim of this study is to investigate the efficiency and flow field of small wind turbines with diffuser. In
    doing the performance analysis, we first compare the power coefficients of bare wind turbines with
    experimental data. The numerical results show consistent trend with that of experimental data. We then
    compare the performance and flow field of bare wind turbines and wind turbines with diffuser. The
    conclusion is that the power coefficients of the latter are higher than that of the former. Three parameters,
    diffuser length, expansion angle, and flange length, were investigated to determine their effects on the
    performance of the diffuser. According to the results, the flange length has the decisive effect. A longer
    flange gives higher power coefficient. There is an optimum value for the diffuser length, too long or too short
    gives worse result. Finally, expansion angle must be greater 14 degrees if a favorable effect is to be obtained.
    Relation: 第七屆海峽兩岸航空太空學術研討會論文集,頁189-195
    Appears in Collections:[航空太空工程學系暨研究所] 會議論文

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