本文使用計算軟體，進行防火安全用防火爐流場之分析。其目的在探討縮小比例的防火爐，在高溫氣體流入後，防火爐和循環管路流場分析。且討論循環管路對於防火爐流場之影響和縮小防火爐比例下，爐內升溫曲線是否能在較低的速度之下符合國際規範的溫度曲線。本研究採用計算軟體Fluent之PISO數值方法進行模擬計算。
在程式驗證，在循環式防火爐架構下，主要進行三維T型管流場驗證、三維空穴流場和三維自然對流流場驗證，以確保其準確性。
實際物理模型長寬高尺寸為2m*2m*2m，並外接直徑為0.2m的圓管來模擬循環管路，並在管路入口流入逐漸增溫的高溫氣體，觀察其內部溫度流場是否有良好的升溫現象，且是否符合國際標準規範的CNS昇溫曲線。並在管路出入口計算出運轉此循環式防火爐，需要多少的能量驅動。計算結果顯示，本研究所設計之循環式防火安全用防火爐，可以達到CNS昇溫標準，且藉由壓力變化，所需要做功隨時間增加而逐漸減少，在模擬時間為30分鐘後，所需要能量約為853J。

In this paper, the flow fields in a fire safety furnace have analyzed by a numerical software. The purpose of this research is to analyze the flow structures and temperature distribution when the high temperature gas go through close-type fire safety furnace. The numerical simulations of flow field in the closed-type fire safety furnace is made by commercial program Fluent.The PISO method is chosen in this program.
Three test cases,three-dimensional t-junctions, three-dimensional cavity flow and three-dimensional natural convection problem, are simulated to see the accuracy of the numerical method.
The physical model of the closed-type fire safety furnace has the size of 2m*2m*2m , and a circular pipe with diameter 0.2m of added. By injecting the elevated temperature gas from the inlet, the temperature distribution in the furnace is observed and is designed to conform the CNS elevated temperature standard. According to the computed data at the inlet, the work consumption in the Closed-Type Fire Safety Furnace is calculated. Our simulation results show, the proposed Closed-Type Fire Safety Furnace achieves the CNS elevated temperature standard and by The work consumption is reduced by time. After 30 minutes of simulation, the work consumption needed is 853J.

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