| 研究生: |
王顥宇 Wang, Hao-Yu |
|---|---|
| 論文名稱: |
高塔式防火爐流場之數值模擬 Numerical Simulations of Flow Field in Towered-Type Fire Safety Furnace |
| 指導教授: |
林三益
Lin, San-Yih |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 航空太空工程學系 Department of Aeronautics & Astronautics |
| 論文出版年: | 2010 |
| 畢業學年度: | 98 |
| 語文別: | 中文 |
| 論文頁數: | 102 |
| 中文關鍵詞: | 高塔式防火爐 、升溫曲線 、燃燒模型 、非預混燃燒 |
| 外文關鍵詞: | Towered-type Furnace, Temperature Curve, Combustion model, Non-premixed Combustion |
| 相關次數: | 點閱:95 下載:2 |
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本文使用計算軟體,進行防火安全用防火爐流場及溫度場分析。其目的在探討相同比例的防火爐模型,內部的燃燒台經過點火燃燒之後,爐內溫度偵測點所偵測到的升溫曲線及速度偵測點所偵測到的速度隨時間變化,是否符合規範中所規定的範圍,並觀察爐內流場及溫度場的變化,其排熱效果是否優良。本研究採用計算軟體FLUENT之PISO數值方法進行模擬計算。
在程式驗證中,在高塔式防火爐架構下,主要進行二維非預混燃燒流場驗證、三維空穴流場及三維自然對流流場驗證,以確保其準確性。
實際物理模型為測試UL790之高塔式防火爐,屋頂設有一排氣裝置,並在空氣入口注入高速常溫空氣,瓦斯進口注入常溫的瓦斯(丙浣、少量丁浣),經過點火之後,觀察其內部溫度流場,及火燄蔓延趨勢,且觀察是否符合規範中所規定的溫度範圍。本研究所建置之高塔式防火安全用防火爐,為典型非預混燃燒模型。模擬結果顯示,其火焰溫度可達規範中所制定的範圍,模擬燃燒時間為10分鐘。
In this paper, the numerical simulations were performed for the flow and temperature analysis of furnace for fire safety. The research objective is to use proportional furnace model to discuss the temperature curve and speed, which were detected by the temperature and speed detectors in the furnace, accord with the stipulated range after internal combustion through burning ignition. In addition, the heat effect of furnace can be observed by the changes of internal flow field and temperature field in the furnace. This study used the PISO solution equation in the CFD (Computational Fluid Dynamics) program FLUENT to simulate the problems.
Three test cases, two-dimensional non-premixed combustion model, three-dimensional cavity flow and three-dimensional natural convection problem, are simulated to see the accuracy of the numerical method.
The real physical model is a towered-type fire safety furnace for UL790 test. The roof has an exhaust device, as well as high speed air which is at the room temperature and gas which is mixed by propane and a little butane inject into the air entry and gas entry, respectively. The internal temperature flow field and the tendency of the flame were observed after burning ignition. The numerical show that the design of results can satisfy the specification temperature range in the furnace. In this paper, the towered-type fire safety furnace is standard non-premixed combustion model. The flame temperature can reach the assigned range. The time period of simulation is 10 minutes.
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