本論文主要探討小容量風能發電系統發電效能之表現。為了迎合實際全尺寸風能系統之量測與分析，風力發電機將在一特別設計之低速風洞測試段中以靜態皮托管來量測在各種不同的轉速下之上游與下游的流體速度及流場分佈。此研究利用量測風力發電下游的速度差推導出其阻力、誘導係數及功率係數等，並將此估計的參數值與實驗量測的數據做比較。根據擴散段測試區之校正速度分佈，其穩態平均速度範圍大約落在每秒5~10公尺左右。從實驗中得知，此範圍之中心流場速度並無明顯的速度驟降，而且最佳測試段坐落於擴散段出口下游50公分處。由實驗結果顯示，在發電系統有阻抗負載的狀況下，在風速7m/s下有最佳的117.04瓦特發電功率發生，其功率係數為0.16，誘導係數為0.082，而估計之阻力為35N，功率係數為0.28。此風速下的風力發電機轉速約在600 rpm以下，而隨著轉速增加，氣動力功率係數、誘導係數與阻力亦隨之增加。於此同時功率係數也呈現類似的趨勢，惟實驗結果顯示估算出之參数值略高於實際量測的結果。此一誤差來源可能是肇因於發電機上之電阻阻抗所發生的溫度效應。本文所建構之量測系統、實驗方法及結果，將可用以提供未來風力發電系統分析所需之概念及數據基礎。

This thesis studies the flow properties behind a small capacity wind power system and investigates its power efficiencies in a low-speed wind tunnel. In order to facilitate the full-scaled wind power system inside the wind tunnel, the test section is specially designed and constructed for measuring the velocity distributions by means of pitot-static tube. The flow properties for measurements include the forward and downstream velocities behind the wind turbine with different electric load states and the rotation speeds of the wind turbines will change accordingly. The drag force, induction factors and aerodynamic power coefficients are first estimated to construct the preliminary analysis for the wind power system to be and compared with the experimental results of the circuit power coefficients. According to the calibrations of velocity profiles at the divergent sections, the steady state mean velocity ranges between 5m/s and 10m/s. There are no abrupt drops of velocities in the center line of the operating test sections, and the best location of testing areas is at 50cm behind the exist of the divergent section. The experimental results show that under the electric resistance type load, the best generation power, power coefficient and induction factors are respectively equal to 117.04W, 0.16 and 0.082 at 7m/s, while the estimates of the drag forces and aerodynamic power coefficient are equal to 35N and 0.28, respectively. As the rotation speed of the wind turbine below 600RPM at 7m/s, the increase of the rotation speed follows the increases of the power coefficient, induction factors and drag force. The tendency of the aerodynamic power coefficients is similar but higher than the experimental results of the generation power coefficients. This discrepancy of power coefficients is believed to be due to possibility of the temperature effect on the electric resistance type load to cause the lower power generation. All the experimental results in the present thesis and the construction of measurement systems can provide a data base and further experimental purposes for the design and analysis of wind power generation systems.

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