本研究以風洞實驗的方式研究垂直軸風力發電機的特性，研究內容分成兩部份：第一部分探討垂直軸風力機在均勻風場、柵網紊流兩種不同的來流風場其輸出功率差異，研究結果顯示，紊流場對其效率具有較佳的表現，主要差異為高風速的區域；且輸出功率與風速為乘冪趨勢關係，紊流場高於均勻流場的指數，並略高於風速的三次方。第二部份為量測垂直軸風力機運轉時葉片周圍的瞬時擾動，研究結果發現紊流場下的自由流因具有較高擾動能量，會壓制葉片本身的氣動現象，譬如翼後緣渦流剝離。於較高尖端速度比時，攻角變化幅度小，且前後兩葉片經過同相位角的時間間隔極短，使翼後緣渦流無足夠時間形成。紊流場雖具有一定的擾動能量，但經相位平均後的周圍流場特性具有高度相似性。

This study is aimed to study the characteristic of a VAWT by Wind Tunnel Experiment. Experiments were first carried out to compare the VAWT working in uniform flow and turbulent flow generated by a grid upstream, and discuss the difference of power generation and performance. The result indicates that turbulent flow has better performance. The main difference occurs at the high wind speed, the power generator is proportional to the power of wind velocity. The exponent obtained under the turbulent flow condition is higher than that under the uniform flow condition, and slightly higher than the cube of wind velocity.
Experiments were made to study the velocity fluctuations produced by the rotating blades. The result indicates the turbulence flow field contained higher fluctuation energy, meanwhile it suppresses the aerodynamic characteristic, such as the vortex shedding of trailing edge. The variation of angle of attack is much smaller during the high tip speed ratio, the time period is much shorter between two blades passes through the same azimuth angle, it causes the vortex shedding of trailing edge have no enough time to develop. The ensemble average results of wind fluctuation around VAWT is highly similar between turbulence flow and uniform flow.

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