為了保持廚房良好的空氣品質以及防止油煙污染產生，抽油煙機是廣泛使用於排除油煙的傳統工具，根據行政院衛生署的統計，在臺灣死亡率最高的癌症是肺癌，推估肺癌產生的原因是廚房油煙污染所造成，因此如有一台高性能的抽油煙機，將廚房油煙完全抽除，一定能減少國人得到肺癌的機率；有鑑於此，打造一台高性能之抽油煙機以及降低其噪音是本文研究的重點。因此本文延續李宜珊之最佳改良模型繼續進行性能改良，並且藉由流場可視化來探討其產生的物理現象，並分析評估其結果後根據其缺失作風機外殼與葉輪的改善。改良之參數主要有葉輪、翼型葉片、輪糓、葉輪大小、蝸型流道以及入口與出口圓錐體等，經由模擬後發現各個改良參數皆會影響抽油煙機之整體性能，其中葉輪大小以及出口圓錐體的影響最大；而本文改良後最佳性能之抽油煙機，其最大流量與出口錶壓分別較初始設計提升了29.8%與28.2%。為了驗證數值模擬的準確性，將抽油煙機實體製作出來，再採用AMCA規範之出口式風洞及CNS 8753聲壓量測技術，測量出抽油煙機之性能表現與噪音結果；實驗結果顯示，模擬值與實驗值誤差皆在10%以內，且壓力-流量曲線整體趨勢亦相當一致；有鑑於此，本研究已建立一套抽油煙機之完整設計模式，可提供廠商一系統化分析與研發工具，對提升抽油煙機整體性能將有所助益。

Range hood is utilized extensively in the kitchen ventilation to maintain the air quality and prevent the soot pollution, which are essential for cook’s health. Thus an increasing demand for the high performance and low noise range hood is generated and motivated this integrated CFD, mockup fabrication, and experimental work. At first, the detailed flow visualization on Lee’s optimum design is executed and examined carefully for serving as the modification reference with the aids of numerical calculations. Later, the systematic and thorough geometry variations on inlet cone, hub, airfoil blade, impeller, spiral housing, and outlet conical cone are implemented for improving its aerodynamic outputs. It is demonstrated numerically that inlet cone, rotor blade, and outlet cone have the strongest impact on this performance enhancement research. Also, 29.8% flow rate increase and 28.2% maximum static pressure gain are achieved by setting parameters appropriately. Thereafter, the range hood mockup is fabricated via a CNC machine and executing the performance measurements in AMCA chamber for experimentally validating the numerical outcome. A comparison between numerical and experimental results indicates an acceptable deviation percentage within 10% for the entire performance curve. In conclusions, this rigorous and integrated study successfully establishes a systematic and reliable design scheme for range hood manufacturer and enlarges the aerodynamic characteristics of Lee’s range hood by almost 30%.

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