區劃空間火場內撒水液滴行為之研究

A Study on the Droplet Behavior of Spray under Postulated Fire in an Enclosure

王瓊媚(Chiung-Mei Wang)

指導教授 ： 鄧治東

中原大學/工學院/機械工程研究所/碩士(2002年)

https://doi.org/10.6840/cycu200200352

摘要

本研究的目的，係探討單一區劃空間火災時在撒水設備作動下，不同粒徑的液滴在火場中的行為及其濃度分佈，並對液滴粒徑對火災流場、溫度和煙層分佈的影響作進一步的探討。
本研究以計算流體力學之控制體積積分法，利用PHOENICS套裝軟體，模擬單一室內空間火災時的物理現象，對於撒水頭作動之火場使用雙流體模型(two fluid model)，並採用界面滑動運算法則(inter-phase slip algorithm, IPSA)，分析其暫態現象；在亂流模式方面，本研究使用標準k-e 模型，以求得火場中溫度、速度、煙層濃度及液滴濃度之分佈。

關鍵字

撒水頭 ； 液滴 ； 區劃空間火災

並列摘要

The purpose of this research is to study the behavior of droplet and the distribution of the spray droplet concentration under the enclosure fire. By carrying out this study, a more detailed knowledge can be achieved for the understanding of the effect of the droplets with different diameters on the flow field, the temperature, and the smoke layer distribution.
The finite-volume formulation associated with the PHOENICS computational methodology was used in the enclosure fire study. For the cases with spray, the two-fluid model coupled with the inter-phase slip algorithm (IPSA) was used. The turbulence model used was the standard κ-ε model. For various simulations of the fire scenarios, the parameters evaluated were concentration (expressed in terms of the mass fraction), temperature, and velocity.
The results obtained from the numerical simulations appeared to be reasonable. However, the methodology developed by this study can be validated by comparing the results obtained from this method with experimental data.

並列關鍵字

spray ； droplet ； enclosure fire

參考文獻

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