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研究生:吳友烈
研究生(外文):Yu-Lieh Wu
論文名稱:細水霧粒徑在不同側風與火源距離條件下之滅火效應研究
論文名稱(外文):Study the effects of droplet diameter and spray height on water mist fires suppression under various ventilation conditions
指導教授:鍾基強鍾基強引用關係
指導教授(外文):Kee-Chiang Chung
學位類別:博士
校院名稱:國立雲林科技大學
系所名稱:工程科技研究所博士班
學門:工程學門
學類:綜合工程學類
論文種類:學術論文
論文出版年:2006
畢業學年度:94
語文別:中文
論文頁數:99
中文關鍵詞:噴頭距火源高度通風條件細水霧滅火時間霧滴粒徑
外文關鍵詞:water mistextinguishing timewater droplet di
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細水霧滅火系統具有無環境污染、滅火迅速、耗水量低及對防護對象損害率小等優點,已被廣為研究並逐漸應用在各種場所作為滅火系統使用。然而迄今為止,細水霧系統並沒有相關之標準或規範可供依循,造成在設計、施工或驗收上,沒有統一的規範可以確認系統之性能與可靠度。主要原因是由於細水霧系統滅火機制之相關影響參數較多且複雜,有些參數並具有交互影響作用,需透過進一步之研究分析及實驗測試來找出細水霧滅火系統之最佳設計參數。
本研究以實驗研究為主,理論模式分析為輔探討細水霧系統之基本抑火特性,並透過全尺寸實驗進行不同細水霧粒徑大小、細水霧噴頭距火源高度及火場中不同通風條件所引起之側風效應對細水霧滅火效應之研究分析。細水霧系統之滅火效能透過實際火源撲滅時間與火場空間溫度變化情形進行比較探討。為探討粒徑對細水霧滅火性能之影響,利用自行設計之噴頭並配合不同放射壓力與流量,以產生不同細水霧粒徑。
研究結果顯示當細水霧放射壓力大於7kgf/cm2、粒徑小於700μm,所有實驗皆能在8秒內快速滅火,細水霧在此條件下,火場通風狀況或是噴頭距火源高度對細水霧滅火時間似乎沒有太大的影響。細水霧噴撒壓力較小時,撲滅火源所需時間隨著噴頭裝設高度與火源距離越遠,呈現增加的趨勢。若細水霧噴頭之設計流量較小,且其放射壓力也不夠大,將會延長有效滅火時間。同時在具有通風的環境下更容易受到影響,滅火時間會隨通風排煙量的增加而延長滅火所需時間。對於火場溫度的影響則呈現無論噴撒壓力大小,噴頭距火源高度越高,吸熱降溫效果越好。
An experiment was conducted in this investigation to study quantitatively the effect of water mist on fire suppression and extinction. In order to produce different water droplet sizes under specific water supply rates and discharge pressure, different characteristics of water mist nozzles were designed and fabricated for experimental program. The water droplet diameter and the distance of nozzle-to-fuel surface were used to investigate the performance of water mist fire suppression effects under different ventilation conditions. The results are discussed by using both gas temperature and fire extinguishing time for different spray characteristics.
As observed from the experimental data, when the water discharge pressure is greater than 7 kg/cm2 the fire extinguishing times are less than 8 seconds for all tests. It seems that when the water discharge pressure greater than 7 kg/cm2 and droplet size less than 700 mm, the fire extinguishing time appears to be independent of the nozzle-to-fuel distance and the ventilation conditions as well. Despite some scatter in the data, the extinguishing time in general decreases with increasing water flow rate. At low water flow rates, the extinguishing time increased when the nozzle was positioned further from the fuel surface. Also, significant reduction in extinguishing time was observed when small droplets were used at low water flow rate. For high water flow rates, the ventilation rate did not have apparent influence on temperature reduction rate.
目 錄
中文摘要 …………………………………………………………… i
目錄 …………………………………………………………… ii
表目錄 …………………………………………………………… iii
圖目錄 …………………………………………………………… iv
一、 緒論……………………………………………………… 1
1.1 背景緣起……………………………………………… 1
1.2 文獻回顧……………………………………………… 2
1.3 研究目的……………………………………………… 4
1.4 研究方法與步驟……………………………………… 5
二、 細水霧系統之理論基礎與滅火特性……………………… 8
2.1 細水霧系統之定義與分類………………………………… 8
2.2 細水霧系統適用範圍……………………………………… 12
2.3 細水霧系統之滅火原理…………………………… 14
2.4 影響細水霧滅火效能之相關參數分析…………………… 17
2.5 影響細水霧滅火機制相關理論分析…..……………… 21
三、 細水霧粒徑之定義與量測…………………………………. 25
3.1 細水霧粒滴尺寸與分佈定義…………..…………….…… 25
3.2 細水霧粒徑取樣可靠度與標準分佈範圍……..…… 27
3.3 細水霧粒徑與分佈相關理論模式…………………… 28
3.4 本研究細水霧粒徑與分佈量測方式………………… 34
四、 實驗計劃……………………………………………… 40
4.1 實驗設備概述……………………………………… 40
4.2 實驗規劃…………………………………………… 46
五、 實驗結果與討論………………………………………… 49
5.1 實驗背景值量測結果…………………………………… 49
5.2 細水霧滴完全蒸發所需時間估算.…………………… 51
5.3 粒徑大小對滅火效能之影響實驗結果…………………… 52
5.4 噴頭裝設高度對滅火效能之影響實驗結果……………… 53
5.5 噴頭裝設高度對滅火效能之影響實驗結果……………… 54
六、 結論與未來展望………………………………………… 78
6.1 結論……………………………………………………… 78
6.2 未來展望………………………………………………… 79
參考文獻 …………………………………………………………… 54
參考文獻
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