本研究主要目的是探討設有喇叭狀入風口的外罩（Shrouded）式多葉片風力渦輪機之性能。風力渦輪機容量的設定為小型風力渦輪機，並以大的吸收風能面積為主要考量。實驗是將一抽風扇置於擴散尾管（Diffuser）後方，利用抽風方式帶動流道內空氣流動，同時以變頻器控制抽風扇馬達轉速，使抽風扇有不同轉速，得以控制流道內有不同風速，故此能測量風力渦輪機在不同風速下，其轉速有何變化，實驗中同時探討不同葉片數目下的渦輪特性，分析結果顯示，風力渦輪機確實在葉片數多時的啟動風速小，能量轉換效率也高，而喇叭狀入風口因面積縮小提高風速，進而提高風能，配合效率高的多葉式風力渦輪機更顯示出外罩式多葉風力渦輪機擁有一般風力渦輪機所沒有的優點。

　　The main purpose of the present study is to investigate in capability of shrouded multi-blade wind turbine with bell-shaped intake. The wind turbine capacity will be set in small wind turbine and the big wind energy area is main design point. In the present experiment, the exhaust fan will be set at the diffuser rear is used to make airflow and the inverter is used to control RPM of motor of exhaust fan and air speed in the flow pass. Thus the RPM change of the wind turbine under various air speeds could be obtained. Meanwhile, the different turbine characteristics under various kinds of blade amount will be discussion in the present experiment. From the result of this analysis, with multi-blade, it is observed that wind turbine have low cut-in wind velocity and high energy transformation efficiency. It could be augment air speed from decreasing bell-shaped outlet area in pass flow. Apparently, collocating high efficiency multi-blade wind turbine, shrouded multi-blade wind turbine has virtues that common wind turbine have not.

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