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楊士震01

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Savonius風機葉片重疊比對輸出功率影響之研究

Studies of the overlap ratio influences on power performance of a Savonius wind turbine

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Keywords：Savonius、重疊比、扭力、功率係數

Savonius, overlap ratio,torque,power coefficient

Abstract：垂直軸式Savonius 風機具有啟動風速低和較大輸出轉矩，其結構簡單、製造成本低、不須固定風像等優點，近年來受到高度重視，本研究以數值模擬配合實驗量測，探討小型垂直軸式Savonius風機葉片，配合風洞系統與扭力量測，數值模擬則採用標準k-ωSST紊流模式及SIMPLE算則，求解不可壓縮雷諾平均Navier-Stokes方程式，實驗結果顯示當葉片周速比增加時，風機旋轉中心處的迴流變大，葉片尖端的渦流變小，而風機葉片間的重疊比可使風機旋轉中心處的迴流變小，同時提升風機葉片的氣動力性能與扭力值。此外，風機扭力系數隨著葉片周速比增加而降低，當葉片重疊比0.2與周速比1.2時，風機功率係數最大值為0.23、實驗測量與數值模擬結果比較頗為符合。

For vertical axis Savonius wind turbine,the starting velocity is low and the output torque is high.The advantages for Savonius wind turbine include the simple structure,low cost and no fixed wind direction,and it is getting more attention recently.In this study,the experimental and simulation methods are performed to investigate the aerodynamic,the torque coefficient and output power coefficient with different values of blade overlap ratio and tip speed ratio.By means of experimental method,the blades of Savonius wind turbine are manufactured.Incorporating the wind tunnel and torque measurement equipment system,the rotating speed of and the torque of wind turbine are measured.The numerical simulation employed the standard k-w SST turbulent model and SIMPLE scheme to solve the incompressible Reynolds-Averaged Navier-Stokes Eq.The experimental results show that the vortex at the center of wind turbine becomes larger and the swirling flow becomes small at the blade tip with the tip speed ratio.With the overlap of blades,the vortex at the center of wind turbine becomes small and it increased the aerodynamics of wind turbine.In addition,the torque coefficient decreases with increase of tip Speed ratio.When the overlap ratio is 0.2 and the tip speed ratio is 1.2,the maximum of power coefficient is 0.23.The simulation results are quite consistent with those of experiments.

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