臺灣博碩士論文加值系統

鼓風機目前已廣泛泛地應用在工業通風與空調系統之中，而在工業製程及室內公共場所的需求上有極高的依賴度，亦是關鍵的零組件之一。由於節能減碳與舒適環境品質越來越受到大眾的重視，開發、普及使用高效率運轉的風機，是在能源漸趨短缺之下各國所共同努力的目標，因此發展出高效能和兼具低噪音環境的鼓風機變得相當重要。而本研究主要是將應用計算流體力學(Computational Fluid Dynamics, CFD)技術，將模擬風機的各點實驗並描繪成靜壓流量曲線(P-Q Curve)，對各種不同靜壓條件下所對應之風量進行差異比較，將模擬數值與實驗結果進行比對，並進行效率分析比對，可以發現鼓風機的特性曲線，模擬與實驗值相當接近，得以使分析結果應用於未來風機設計改善之參考依據。以往的鼓風機流場分析，是以MRF(Multi Reference Frame)與穩態模式進行分析，是一種動態的交互影響，因此若用穩態來模擬，其結果為類似一個平均值，其氣流之間交互作用所造成的影響，很難加以分析。故本文將應用CFD中的動態網格技術進行暫態分析，進行兩款鼓風機的流場分析，為穩定後一段時間的模擬平均值與實驗值進行比較，可以發現模擬與實驗的結果亦相當接近，並比較此兩款鼓風機之性能差異。此外，本研究也將進行鼓風機運轉噪音的探討，進一步地將運算結果應用至聲壓場的音源輸入，進行模擬估算鼓風機的氣動力噪音，再與實際量測的噪音值作比較，其之間的誤差值可作為未來在改善鼓風機效能與噪音降低上的設計參考重點。

The blowers have been used in industrial ventilation and air-conditioning systems extensively, and the industrial process and indoor public places are highly dependent on them, they are one of key parts and components. The energy saving and carbon reduction and comfortable environment quality are paid increasing attention to, developing and popularizing high efficiency fans are the common objective of various countries while the energy is becoming short gradually. Therefore, it is quite important to develop a high-performance and low noise blower. This study uses Computational Fluid Dynamics (CFD) technology to simulate experiment on various points of fan and describes them as P-Q Curve, the air volumes corresponding to different static pressure conditions are compared, the simulation values are compared with the experimental results, and the efficiencies are analyzed and compared. According to the characteristic curve of blower, the simulation and experimental values are quite similar, the analysis results can be reference frame for improving the fan design in the future. The blower flow field was analyzed by MRF (Multi Reference Frame) and steady-state model in the past. It is a dynamic interaction. Therefore, if the steady state is used for simulation, the result is similar to a mean value, it is difficult to analyze the effect of the interaction of air flows. Therefore, this paper will use the dynamic grid technology of CFD for transient analysis. The flow fields of two blowers are analyzed. The mean value of simulation and experimental value after a period of stabilization are compared, the simulation and experimental results are quite close to each other, and the performance difference between the two blowers is worked out. In addition, this study will discuss the blower running noise, the computing result will be used in the sound source input of sound pressure field to estimate the aerodynamic noise of blower, which is compared with the measured noise level. The error value can be used as the key reference for improving the blower effectiveness and noise reduction in the future.

摘 要 I
ABSTRACTIII
致 謝 V
目 錄 VIII
表 目 錄 XI
圖 目 錄 XIII
符號說明 XX
第一章 緒論1
1.1 前言 1
1.2 研究動機與目的3
1.3 論文架構6
第二章 背景與文獻回顧10
2.1 風機介紹10
2.1.1 風機分類10
2.1.2 離心風機工作原理12
2.1.3 葉片型式介紹14
2.1.4 鼓風機概述與文獻17
2.2 噪音介紹19
2.2.1 聲音定義與特性19
2.2.2 室內噪音指標與規範24
2.2.3 風機噪音與測量31
2.2.4 噪音概述與文獻34
2.3 數值模擬分析概論36
2.3.1基本統御方程式36
2.3.2 紊流流場模式39
2.3.3 數值分析概述與文獻41
第三章 實驗架設與研究方法43
3.1 離心式鼓風機測試標準43
3.2 多翼式鼓風機測試標準44
3.3多翼式鼓風機實驗架設45
3.4 多翼式鼓風機環境噪音量測55
第四章 數值模擬與分析58
4.1 問題與討論58
4.2 數值模擬軟體應用59
4.3 風機實體建模62
4.3.1 離心式鼓風機建模62
4.3.2 多翼式鼓風機建模63
4.4 數值模擬流程64
4.4.1 離心式鼓風機邊界條件設定65
4.4.2 多翼式鼓風機邊界條件設定71
4.5 聲學模擬軟體應用75
4.6 聲學模擬流程77
第五章 結果與討論79
5.1 實驗流場分析79
5.1.1 離心式鼓風機流場分析 79
5.1.2 多翼式鼓風機流場分析 81
5.2 數值模擬流場分析85
5.2.1 離心式鼓風機模擬分析 86
5.2.2 多翼式鼓風機模擬分析 93
5.3 實驗噪音量測分析101
5.3.1 離心式鼓風機噪音量測 101
5.3.2 多翼式鼓風機噪音量測 102
5.4 噪音模擬數值分析107
5.4.1 離心式鼓風機噪音分析 107
5.4.2 多翼式鼓風機噪音分析 117
6.1 結論 125
6.2 未來展望129
參考文獻 130

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