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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/61225

    Title: 垂直軸風力發電機之氣動聲學特性;Aeroacoustic Analysis of a Vertical Axis Wind Turbine
    Authors: 高國峻;KAO,KUO-CHUN
    Contributors: 機械工程學系
    Keywords: 垂直軸風力機;ANSYS FLUENT;氣動聲學;FW-H方程式;Vertical Axis Wind Turbine;ANSYS FLUENT;Aeroacoustics;FW-H equation
    Date: 2013-07-24
    Issue Date: 2013-08-22 12:15:26 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 本研究探討垂直軸風力渦輪機之聲學特性,利用ANSYS FLUENT計算風力機周邊之流場,並使用其Acoustics Model進行聲學模擬,氣動聲學之理論中藉由FW-H 方程式,風力機葉片上之速度與壓力可選為聲源,其物理意義為單極子與偶極子;此外由permeable FW-H 方程式,聲源可為包含葉片與紊流流場之流體介面,意義為包含單極子、偶極子與四極子的影響,並針對不同聲源設定,在不同風速、轉速下進行模擬。
    In this study, the aeroacoustic characteristics of a small vertical axis wind turbine are analyzed by using ANSYS FLUENT. The FW-H theory with a permeable surface is chosen for formulation. The pressure and the velocity on the rotating blades surface provide the monopoles and dipoles while turbulences surrounding the blades give the quadrupole effect. Then, the aeroacoustic noise due to the rotating wind turbine are investigated for different wind speeds and rotating frequencies.
    For a simple model of blades with or without considering the supporting tower, the numerical results show that the maximum sound pressure, due to blade rotating, usually occurs at the blade passing frequency although it is in the subsonic region. There is additional broadband noise, resulted from turbulences, near the frequency region 200Hz to 500 Hz. Actually, the broadband noise dominates the sound from a turbine. The maximum sound pressure level and its corresponding frequency usually increase with rotational frequency.
    Appears in Collections:[機械工程研究所] 博碩士論文

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