空氣濾清器在優化居住環境扮演重要角色，其性能直接影響空氣品質優劣，為提升空氣濾清器之氣動力性能，本研究針對其動力來源斜流式風機進行數值分析及優化；首先將護罩及背板初步修改以配合空氣濾清器內部流場，並針對入口角、扇葉圓弧、出口角、葉數及加入NACA翼型進行初步優化，透過模擬確認改良參數組合使風機性能明顯提升最大流量53%、效率102%。接著將初步優化設計製作模型，安裝在空氣濾清器中執行AMCA風洞之性能實測，其實測數據與數值模擬進行比對後，結果顯示兩者誤差約為5%。隨後應用田口法分析進行兩階段優化，選用8項控制因子及3水準，控制因子分別為翼型、弦長、出口角、扇葉圓弧、安裝角、葉片數、翼型與Y軸及X軸相對位置，規劃兩次L9直交表排列，透過數值模擬分析各模型之流量與效率，並計算出訊噪比分析控制因子對風機性能之影響。最後針對護罩參數之曲率半徑以及空氣濾清器出口外型加入翼型，調整肋條之安裝角及彎曲半徑，最佳改良風機安置於空氣濾清器後，將最大流量與效率分別提升至782.32CFM(80%)與5.86CFM/W(128%)。歸納上述結論，本文所探討的斜流式風機經過系統化參數優化後性能獲得大幅的提升，並得知各項控制因子對性能之影響程度。

This research integrates numerical and experimental technologies to enhance the performance of air cleaner, which plays an essential role on improving the air quality in the living environment. First, a preliminary parametric study is conducted to improve the inclined-flow rotor under the housing of air cleaner with modified shroud and backplate. The rotor variables consider here include the number, the arc profile, the inlet and outlet angles of rotor blade, and addition of NACA airfoil. Subsequently, significant increases on flow rate (53%) and energy efficiency factor (102%) are attained and confirmed via the performance experiment on the 3D-priting prototype in an AMCA test chamber. Also, the reliability of CFD tool is verified by a 5% deviation between test and CFD perdition. Next, the comprehensive optimization on rotor is executed with the aids of Taguchi method with 8 variables and 3 levels. Besides parameters in the first optimizing stage, the setting angle, the chord length, and the airfoil position are taking into consideration. With simulation outcomes serving as test results, two L9 arrays are designed and analyzed the flow rate and efficiency factor for each model. In addition, the signal-to-noise (S/N) ratio was calculated to evaluate the performance impact of each parameter. Afterward, geometries of the shroud and the air-cleaner outlet are adjusted systematically for meeting the flow field generated by the aforementioned optimized impeller. In conclusion, the optimum air cleaner generates the maximum flowrate of 782.3CFM with the energy efficiency factor of 5.86 CFM/W, which represents 80% and 128% enhancements compared to the original design, respectively.

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