根據行政院衛生署的統計，惡性腫瘤為國人十大死因第一名，其中肺癌高居女性癌症死亡率第一名，然而國內女性吸煙人口比率並不高，但肺癌卻是一直位居女性癌症之首，因此推測其主要因素與烹煮所產生的油煙脫離不了關係；所以若有一台高性能、低噪音的抽油煙機，則能將油煙有效抽除以減少得到肺癌機率，並可使廚房的空氣品質更加良好。有鑑於此，本文將應用風機設計理論進行抽油煙機之性能改良，先藉由計算流體分析軟體的流場可視化功能，來探討抽油煙機內部所產生的物理現象，並系統化地分析評估其結果，再根據其流場缺失進行改善。而所改良之參數主要有入口圓錐體、葉輪、翼型葉片與蝸型流道等，經模擬後發現各個改善參數對抽油煙機之整體性能皆有影響；本文最後所得之最適化抽油煙機設計，在相同的轉速下，其出口流量與錶壓分別較原始市售產品大幅提升了64.7%與49.7%，而在相同出口流量為基準下相比，最適化設計之風機其所需要之馬力與扭力值皆比較低，可以說是一項達到節能效果之高性能設計產品。
為了驗證數值模擬的準確性，本研究將最適化設計之抽油煙機實體經CNC加工製作出來，以進行相關氣動力性能與噪音量測；其實驗結果顯示，模擬值與實驗值的壓力-流量曲線趨勢相當一致，且兩者之偏差值在4%以內，對數值模擬來說有一定的可信度與可靠度。為了方便評估本設計產品之優異性，利用風扇相似定律推算在相同之輸出風壓下，最適化設計只需要原始產品的79%耗電量，即可達到與市售產品相同之輸出壓力；而且也增加了27%的排油煙量，同時噪音方面也比降低了1.9dBA，可清楚看出最適化設計是一項高效能、低噪音及省電之產品。綜合歸納上述成果顯示，本研究成功地建立一套結合數值、實體製作與實驗的抽油煙機之研發設計系統，能大幅提升抽油煙機之氣動力與噪音整體性能，有效地解決廚房油煙之汙染與噪音問題，可供廠商進行系統化的研發工具。

Based on Taiwan governmental report, lung cancer is the most popular disease and has become the leading fatal factor for female patients during the past decade. Because of the small smoking female population in Taiwan, thus it is inferred that this phenomenon primarily results from the cooking smoke and soot pollutions inside the kitchen, where utilizes the range hood as the ventilation tool. Hence, a substantial demand for the high-performance, low-noise range hood exists and motivates this integrated CFD, experiment, and fabrication research. Firstly, a commercial range hood is chosen as the reference model based on the test report from the consumer magazine. Then, a comprehensive CFD simulation is executed to visualize the flow patters inside this device and identify the adverse circulation and reversed flow for finding out the possible improvement alternatives. In addition, this work considers several essential modifications such as inlet cone, rotor, airfoil blade, and casing redesign, which affect the overall performance of range hood. Consequently, with the aids of parametric study, the optimum range hood demonstrates a considerable enhancement on the maximum flow rate and static pressure by 64.7% and 49.7%, respectively. In addition, this numerical simulation provides the required motor torque, which is much lower than that of the reference model operating at the same condition.
With intension to support the CFD prediction, a prototype of range hood is fabricated via CNC machine to carry out the aerodynamic and acoustic performance tests inside the AMCA chamber and the semi-anechoic room for ensuring the reliable experimental outcomes. As a result, the calculated and measured results correlate well with an acceptable 4% deviation over the entire performance curve. Besides, a noise reduction is observed from comparing the test results between the reference and optimized range hoods. To clearly demonstrating the superiority on both aerodynamic and efficiency viewpoints, this study uses the fan law to transform those experimental performances under the same comparison criteria, such as a specified pressure output. It follows that the optimal design can deliver an extra 27% airflow at the same static pressure and only need 79% power consumption of the commercial range hood. Therefore, it is obvious that this optimal design is not only a high performance and low noise, but also an energy saving product. In summary, this research successfully establishes a rigorous and effective design scheme for serving as an important R&D tool to design and manufacture the high performance range hood.

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