本研究提供了垂直軸風力發電機於風洞實驗之結果，風洞測試段高度為4米、寬度2.6米，自由來流紊流強度低於0.4%。風力發電機模型直徑為0.84米，轉子由三片NACA 4415葉片所組成，其弦長為0.15米，長度1.2米。實驗風速10~15米/秒。經由不同之自由來流可繪製出發電機之輸出曲線。

為了瞭解風力機周圍流場特性，實驗上使用熱線測速儀來量測風力機周圍流場，而使用扭力感測器架設於風力機轉子與發電機之間，量測得知轉子機械能輸出。利用熱線測速儀於λ=0.07、0.13以及0.43下量測流場平均速度與瞬時擾動量，這些資料可更加了解風力機之氣動力與非定常流場特性。

本研究主要成果在於將流場量測數據以平均速度、紊流強度、速度週期性分布以及週期速度之標準差無因次化來分析，並利用折合頻率判斷為擬定常或是非定常流場。此外，風力機扭力量測上發現扭力將因動態失速而有降低之現象。最後將流場量測結果與計算流體力學軟體模擬比較，未來將進行水洞視流實驗並與風洞流場量測相互相比較。

This research presents the experimental results obtained with a vertical-axis wind turbine tested in a wind tunnel. The test section of the wind tunnel has a height and a width of 2.6m and 4m respectively. The turbulence intensity of the free stream is less than 0.4%. The wind turbine, 0.84m in
diameter, is made of three straight blades, each of which is 1.2m in height and 0.15m in chord length. In studying the performance, the wind turbine was equipped with a power generator and a torque meter, and was conducted over
a speed range of 10-15 m/s . The experimental data obtained at two free stream velocities were reduced to the curves of the power output.

Moreover, the wake flow structures behind the wind turbine were studied with hot-wire probes situated around the wind turbine at λ=0.07, 0.13 and 0.43. The velocity data obtained enabled us to study the mean and fluctuating flow characteristics around the wind turbine. The major findings include the mean velocity distributions, turbulence intensity distributions and ensemble average velocity patterns with respect to the phases a cycle of wind turbine
rotation. From the results obtained one can further
differentiate the flow condition variations between quasi-steady and unsteady in terms of the reduced frequencies. Finally, the experimental results are compared and discussed with the results of CFD obtained by the co-workers. The data will also be compared with the flow visualization results in a water channel in the future.

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