風力發電機發展至今，已漸漸開始應用於一般小型家庭發電，在國內外皆有許多的廠商開發及販售；而許多販售之風力發電機之性能測試，皆是以平地為基本模型進行量測或是以風洞實驗取得其性能數值。然而，安裝於高樓或是裝置基地加高的風力發電機，其實際風場必定與平地實驗測試大不相同；而一般之風場量測觀察，亦是以區域性的量測為主，無法得知風場可能因建築物而造成局部風場之改變，更無從了解其對風力發電機的性能影響。因此本研究選用啟動性較佳的垂直軸風力發電機- Savonius風力機為對象，針對其運轉情形的流場及速度場之變化作討論分析；同時模擬此風力機在不同風場（平地、樓頂）及女兒牆後方不同位置下，所得到的流場與氣動力性能，以供架設風力發電機有可靠之參考。接著就不同高度的女兒牆進行系統化的參數模擬，並將所得到的結果作無因次分析的比較，以提供未來風力發電機在裝置前，可先依實際女兒牆後之風場進行評估。最後將建造出一台快拆式、可置換且裝機安全的風力發電機測試平台，進行實體風力發電機實際測式的工作，並且分析風力發電機所得到的性能數據，以供未來進行此測試平台之可靠參考。

Small scale wind power development has grown exponentially nowadays, lots of green-energy companies are trying to develop and make business to harvest wind energy. Most of their products performance are tested on-field and/or in the wind tunnel; however, the wind turbines’ performance deviate significantly when they are installed on the top of building due to local flow patterns. Therefore, realizing the corresponding performance influence caused by geometrical parameters becomes an urgent need and the goal of this research. At first, the installation position effect to vertical axis wind turbine’s (VAWT’s) performance technique is discussed step by step, by using numerical. The start-up ability, flow pattern, and performance characteristics are compared between the on-field and on the top of building installations. In addition, this investigation also discussed about the flow pattern behind the parapet wall and the performance of VAWT setting up at various locations behind the parapet wall with different height, and results being applied to VAWT on the building’s rooftop. Furthermore, a dimensionless analysis is performed to generalize these entire problems. Finally, a VAWT prototype is fabricated and installed on the flexible experiment platform to measure the power coefficient of wind turbine and make comparison with the corresponding simulation results. In summary, this integrated research successfully combines the simulations and experimental together to provide the capability to estimate the possibility in harvesting wind energy and reliable informations related with installing the wind turbine on the rooftop.

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