A study of the probability distribution of pool fire extinguishing times using water mist |
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| Institution: | 1. School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, China;2. Institute of Industrial Technology of Guangzhou and Chinese Academy of Science, Guangzhou 511458, China;3. Department of Civil and Architectural Engineering, City University of Hong Kong, Kowloon, Hong Kong, China;1. Department of Fire Protection Engineering, University of Maryland, College Park, MD, USA;2. United Technologies Research Center, East Hartford, CT, USA;1. Italian Aerospace Research Centre, Via Maiorisi, 81043 Capua, Italy;2. Department of Industrial Engineering, University of Naples “Federico II”, Piazz.leTecchio, 80 – 80125 Napoli, Italy;3. ITT Marie Curie, via Argine 902, 80157 Napoli, Italy;1. LEMTA, Laboratoire d?Energétique et de Mécanique Théorique et Appliquée, Université de Lorraine, UMR 7563, CNRS, Vand?uvre-lès-Nancy F-54500, France;2. CNPP, Centre National de Prévention et de Protection, Vernon, France |
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| Abstract: | Water mist, a replacement for Halon gaseous agents in fire fighting, has been studied for decades. However, the fire-extinguishing reliability of water mist is debated. For example, there are significant differences in extinguishing times between tests conducted under the same conditions, and water mists have difficulty extinguishing small fires. To date, no study of the probability distribution of extinguishing times has been reported. In this study a statistical analysis of the extinguishing time distribution of pool fires extinguished using water mist is presented. The fire sources were circular/square stainless steel pans with gasoline, diesel, ethanol or daqing RP-3 as fuel. Two types of extinguishing scenarios were observed. In one situation, the fire was extinguished via a blow off process, when the flames had not yet been suppressed. Flame cooling is the primary fire extinguishing mechanism; the mass loss rate and combustion heat of the fuel are two key factors. In the other situation, the fire was initially suppressed and subsequently extinguished after a long suppression stage. Surface cooling is the primary fire extinguishing mechanism; the flash point of the fuel is the key factor. |
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| Keywords: | Pool fires Water mist Fire extinguishment Flame cooling Surface cooling Variance analysis |
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