臺灣博碩士論文加值系統

本研究是利用FLUENT套裝軟體進行防火安全用防火爐流場之數值模擬，其主要目的探討防火爐中，在加溫過程中爐內升溫上升之均溫現象，並採用可壓縮流流場模型來模擬防火爐流場分佈的情形，數值方法選擇SIMPLE來進行模擬計算。
在程式驗證方面，選取了幾個簡單的例子：三維空穴流、三維自然對流、自然對流和強制對流共四個物理模型來實用FLUENT的準確性與可靠度。其中三維空穴流為了驗證不可壓縮流在三維結構的可靠度，而三維自然對流和自然對流其目的是要了解熱傳遞的特性，最後因本研究屬強制對流的部份，故須對此做驗證。
實際物理模型的部份為國立成功大學防火安全研究中心所提供的防火爐，其尺寸為4.4m(x)*4.2m(y)*2.1m(z)，用實驗所量測出可接受的最低風速來做全尺寸模擬並討論其防火爐在高溫氣體下的流場變化情形，計算結果可以驗證防火中心的防火爐有很好的升溫現象，符合CNS之升溫曲線要求。

This thesis uses the numerical method to study the homogeneous temperature phenomenon of heating process in the fire safety furnace. The method applies the incompressible or compressible Navier-stokes to simulate the distribution of flow field in fire safety furnace. Numerical simulations obtained from commercial software (FLUENT) were also performed to validate experimental results. Here the SIMPLE algorithm is chosen in this software.

In this study, four simple examples, 3D cavity flows, 3D natural convection, natural convection and forced convection, are chosen for programming verification. Numerical Simulations confirms the accuracy and credibility in performing with the four physical models. Among them, the 3D cavity flows is used to identify the credibility of incompressible flow in the 3D structure. The purpose of 3D natural convection and natural convection is to understand the characteristic of the heat transfer.

The inlet velocity, v=22.15815 m/s and is imposed. The CNS elevated temperature is used as inlet temperature. The flow structures and temperature fields are investigate in this study.
The simulation results indicate the temperature distribution in the fire safety furnace is very uniform. It suggests that the furnace can be used as a fire safety facility.

中文摘要 I
Abstract II
誌謝 III
符號說明: IV
第一章 緒 論 1
1-1前言 1
1-2動機與目的 3
1-3內容大綱 4
第二章 數值方法 6
2-1統御方程式 6
2-2數值方法 11
2-3 程式操作設定流程與軟體簡介 11
2-3.1 二維穩態傳熱不可壓縮流 13
2-3.2 二維穩態傳熱可壓縮流 16
第三章 程式驗證 17
3-1 三維空穴流(Three-Dimensional Cavity Flow) 17
3-2 三維自然對流(Three-Dimensional Natural Convection) 20
3-3 自然對流(Natural Convection) 22
3-4 強制對流(Forced Convection) 23
第四章 數值模擬結果與分析 25
4-1防火爐流場之模擬 25
4-1.1 邊界條界設定 25
4-2防火爐之溫度回饋裝置 26
4-3 FLUENT基本設定 28
4-3.1 結果與討論 29
第五章 結論與建議 34
5-1結論 34
5-2建議 35
參考文獻 37
自述 149

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