Recent Progress in Methods of Generating Water Mist for Fire Suppression

Guangxuan, Liao; Xin, Huang; Beihua, Cong; Jun, Qin; Jianghong, Liu; Xishi, Wang

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자료유형: 학술저널

저자정보: Guangxuan, Liao (State Key Laboratory of Fire Science, University of Science and Technology of China) Xin, Huang (State Key Laboratory of Fire Science, University of Science and Technology of China) Beihua, Cong (State Key Laboratory of Fire Science, University of Science and Technology of China) Jun, Qin (State Key Laboratory of Fire Science, University of Science and Technology of China) Jianghong, Liu (State Key Laboratory of Fire Science, University of Science and Technology of China) Xishi, Wang (State Key Laboratory of Fire Science, University of Science and Technology of China)

저널정보: 한국분무공학회 한국액체미립화학회지 한국액체미립화학회지 제11권 제4호

발행연도: 2006.1

수록면: 251 - 265 (15page)

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연구배경

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연구방법

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To prevent the ozonosphere from being destroyed by Halon, it is an urgent task to find out Halon replacement. As one of the replacements water mist have showed broad applications by its advantages: little pollution to environment (not destroying the ozone layer or bring green house effect), extinguishing fire quickly, consuming a small quantity of water and having little damage to the protected objects. The methods of generating water mist strongly influence fire suppression effectiveness, which determine the cone angle, drop size distribution, flux uniformity, and momentum of the generating spray. The traditional water mist nozzle included pressure jet nozzles, impingement nozzles and twin-fluid nozzles. All of them have more or less disadvantages for fire suppression. Therefore, many research institutes and corporations are taking up with innovations in mist generation. This article provided some recent studies in State Key Laboratory of Fire Science (SKLFS) of University of Science and Technology of China. SKLFS have investigated new methods of generating water mist (i.e. effervescent atomization and ultrasonic atomization). and self developed a series of nozzles and developed advanced DPIVS (Digital Particle Image Velocimetry and Sizing) technique. Characteristics of water mist (the distribution of droplet sizes, flux density, spray dynamics and cone angle) produced by these nozzles were measured under different conditions (work pressure, nozzle geometry, etc.) using LDV/APV and DPTVS systems. A series of experiments were performed to study the fire suppression effectiveness in different fire scenario (different kindsof the fuel, fire size and ventilation conditions). The fire extinguishing mechanisms of water mist was also discussed.

#water mist #characteristics of water mist #fire suppression effectiveness #fire extinguishing mechanisms

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