新型具導風板打蛋型垂直軸風力機之扭力分析

Abstract

本研究利用模擬分析研究各種風力機運作行為，並根據模擬分析結果設計新型風力機。目的設計一種新型打蛋型垂直軸風力機，可提升風力機葉片轉速和降低啟動風速，讓風力機可設置在風場多變的都市環境。經由模擬分析，在風速10米下，風向對方位角90度位置之旋轉葉片設置偏轉約五度導風板可提升葉片平均扭矩約9%。在依序對方位角60，30度位置之旋轉葉片設置導風板後，對平均扭矩可依序提升約15.1%和17.9%。利用無因次化製作縮尺模型並置入風洞實驗，原始風機啟動風速約6.12米，在加裝導風板裝置後下降約6.2%。且在風速約11米風下時，轉速約提升13.4%。並再利用開放式風場實驗，設計可準確面風之導風板機構。驗證本研究新型風力機確實相較原有打蛋型垂直軸風力機，啟動風速下降，且當下風速的葉片轉速與原本風力機相比提升許多。

In this thesis, the rotational torques of several wind turbines used for wind power generation are simulated using different aerodynamic methods. Based on the above results, a new design of a Darrieus vertical axis wind turbine (VAWT) is developed. The proposed new Darrieus VAWT which has movable wind guiding panels can possess lower cut in wind speed and higher rotational speed during operation when compared with the traditional one. The simulation results has shown that the wind guiding panels with slant angles of 5 degree at the location angles of 90, 60, and 30 degrees can increase the average torques by 9%, 15.1% and 17.9s%, respectively at wind velocity 10 m/s. In experimental study, a scaling down model of the wind turbine determined in a dimensional analysis is fabricated through 3D printing. In the wind tunnel experiment, it has been shown that the wind guiding panels can lower the startup wind velocity by 6.2% in comparison with the original one and raise the rotation speed 13.4% at wind velocity 11 m/s. In testing the mobility of the wind guiding panels, it has been demonstrated that the wind guiding panels with a tail design can always face the incoming wind from any direction.