電風扇在家庭中是一項不可或缺的電器產品，隨著科技進步與技術上的蓬勃發展，人們對於生活品質要求也有所提升，對於家電產品性能也特別重視；另因工業過度發展，使得溫室效應造成全球暖化，因此人們更加注重節能減碳，另外對於節能也可減少成本開銷。電風扇發展至今，鮮少有針對立地式電風扇之性能及氣流特性進行分析研究，市面上大都使用相似外型來進行販售，僅以改變馬達性能來達到節能之效用，另外對於扇葉保護罩僅以安全性為主要訴求，較少對於氣流場走勢及變化進行探討；因此，本研究將透過數值模擬方式進行流場分析，利用有系統的參數化設計來進行研究，並將最適化設計製作出實體化模型，利用模型來進行實驗量測，希望能用數值模擬來探討各設計參數之影響效益以及實驗與數值結果之可靠度。
首先，本研究將分扇葉單體及保護罩兩部份進行設計分析，扇葉單體本身對於電風扇性能影響較大，因此先針對扇葉單體進行研究探討，在此藉由CFD數值模擬軟體FLUENT，針對扇葉之安裝角、扭轉角及傾角等參數分析評估，並且觀察其流場情況及性能預測之差異；接著扇葉保護罩將搭配最適化扇葉進行研究分析，利用改變保護罩之距離、肋條外型及角度等參數進行改良，最後令兩者之最適化結果做整合，再將此最適化設計利用CNC加工製作模型，並進行相關氣動性能與噪音量測，以相互驗證實驗結果與數值模擬之準確性及可靠度。
氣動特性量測系根據能源之星(ENERGY STAR)吊扇量測規範及國家標準CNS 2061立地電扇量測標準，將兩者整合並建立一測試方式，測試得到之實驗數據與數值模擬相互比較後，顯示出不論是競品與最適化電風扇，得到實驗值與模擬值之性能趨勢結果一致，兩者的數值差異在10~14%之可接受範圍內，證實數值模擬方法具有一定的準確度。在性能之實驗測試上，最適化電風扇與競品電風扇之性能比較，結果顯示本設計電風扇在氣動特性表現上優於競品電風扇，其最大流量提升54%且氣流場分佈也較均勻廣闊，整體流場速度對於人體之影響也感到較為舒適。綜合上述之研究成果顯示，本文所研究之立地式電風扇已達到提升性能之目標，因此其設計流程、測試方式及相關參數應用可供後續業界作為研究開發參考。

For meeting people’s requirements on life quality, the high-performance stand fan has become an essential appliance in every family. On the other hand, energy saving can not only solve the problem of environment protection, but also can reduce the cost of energy consumption. However, the aerodynamic performance and flow characteristic of stand fan are rarely investigated and analyzed in a systematical manner. Therefore, this research intends to investigate the physical mechanism of the flow pattern and identify the design parameters of stand fan by combining the numerical and experimental tools.
First of all, a commercial 14-inch stand fan is chosen to analyze its construction and performance for serving as the reference fan. The stand fan can be divided into the rotor and the protective cover. Clearly, the impeller blade has a great influence on the fan performance so that the fan impeller is the first design target. In this work, CFD software Fluent is used to evaluate and observe the corresponding influences on flow pattern and aerodynamic performance caused by the design parameters such as the setting, twist, and inclining angles. Then, the protective fan cover is studied and improved to integrate with the designed rotor for a superior fan performance. The protective cover is modified by imposing the appropriate distance, shape and the rib angle in order to improve the fan’s flow field and performance. Finally, the optimal fan mockup is made via CNC technology for measuring the acoustic and aerodynamic performances, which are used to validate the accuracy and reliability of the numerical simulation.
After comparing experimental results with the numerical simulation, it is shown the experimental results are in agreement with the numerical simulation within the deviation range of 10~14%. Moreover, the test results show that the designed stand fan is better than the reference fan with a significant 54% increase on flow rate and a more uniform velocity distribution for the comfortable feeling for human body. In summary, this research successfully establishes a reliable and systematic scheme to design the stand fan. Also, the corresponding performance influences caused by those important parameters are analyzed and summed up for serving as the design reference for the stand fan.

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