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研究生: 陳柏祥
Chen,Po Hsiang
論文名稱: 創新式舌部應用於燃氣爐具之離心風機的性能及噪音優化
Innovative Tonque Applied on Performance and Noise Optimization for Centrifugal Fan
指導教授: 林顯群
Sheam-Chyun Lin
口試委員: 林榮慶
Zone-Ching Lin
周永泰
Yung-Tai Chou
學位類別: 碩士
Master
系所名稱: 工程學院 - 機械工程系
Department of Mechanical Engineering
論文出版年: 2022
畢業學年度: 110
語文別: 中文
論文頁數: 192
中文關鍵詞: 燃氣離心扇流/聲場數值模擬創新式舌部性能最佳化減噪
外文關鍵詞: Gas blower, Numerical flow/acoustic simulations, Innovative tongue, Optimized performance, Noise reduction
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摘 要 I Abstract III 致 謝 V 目 錄 VI 圖索引 XI 表索引 XVI 符號索引 XVIII 第一章 緒論 1 1.1 前言 1 1.2 文回顧獻 3 1.2.1 離心風機設計 4 1.2.2 風機降噪研究 13 1.2.3 數值模擬 21 1.3 研究動機與流程 24 第二章 燃氣爐具介紹及離心風機設計 30 2.1 燃氣爐具簡介 30 2.2 離心風機之理論介紹 32 2.3 傳統離心風機設計 38 2.3.1 葉輪設計 38 2.3.2 殼體設計 40 2.4 風扇噪音介紹及舌部降噪設計 42 2.4.1 風扇噪音介紹 43 2.4.2 舌部減噪設計 46 第三章 數值方法 48 3.1 統御方程式與紊流模型 49 3.1.1 統御方程式 49 3.1.2 紊流模組 50 3.2 聲學模式 53 3.3 數值求解流程 56 3.3.1 求解流程 57 3.3.2 離散化方程式 59 3.3.3 上風差分法 61 3.3.4 速度與壓力之耦合 62 3.4 邊界條件 64 第四章 原始風機之模擬分析 66 4.1 數值模型及網格劃分 66 4.2 風機性能之模擬結果與設計目標 72 4.2.1 原型風機之流場分析 74 4.2.2 風機之設計目標 78 第五章 風機的參數分析與性能改良 80 5.1 葉輪改良 81 5.1.1 大葉片之入、出口角度 82 5.1.2 大葉中段設計 87 5.1.3 翼型小葉設計 90 5.1.4 大葉根部之微調引導設計 98 5.2 傳統式舌部之優化設計 105 5.2.1 舌部位置 105 5.2.2 舌部前緣半徑 107 5.3 創新式舌部設計 114 5.4 葉輪高度調整 121 5.5 殼體迴流擋板與風機出口下方之迴流改善 125 5.5.1 殼體迴流擋板 129 5.5.2 風機出口截面之優化 133 第六章 創新舌部之風機性能及噪音模擬 137 6.1 裝配不同舌部之風機性能模擬比較 137 6.1.1 P-Q及效率之曲線比較 140 6.1.2 流場圖比較 143 6.1.3 壓力分佈圖比較 157 6.2 風機裝配不同舌部之噪音比較 162 6.2.1 風機暫態模擬方法及聲源位置 170 6.2.2 風機噪音模擬之結果比較 173 第七章 結論與建議 177 7.1 結論 177 7.1.1 離心風機之性能設計 179 7.1.2 裝配不同舌部風機之性能及聲學特性分析 182 7.2 建議 184 參考文獻 186

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