Experimental study on the interaction of fine water mist with solid pool fires  

作　　者：刘江虹 廖光煊 厉培德 秦俊 陆夕云 

机构地区：[1]State Key Laboratory of Fire Science , University of Science and Technology of China [2]Department of Mechanics & Mechanical Engineering, University of Science and Technology of China

出　　处：《Science China(Technological Sciences)》2003年第2期218-224,共7页中国科学（技术科学英文版）

基　　金：supported by the China NKBRSF Project(No.2001cB409600);the CAS K.C.Wong Post-doctor Research Award Fund(No.47).

摘　　要：This paper describes experimental study of the interaction of fine water mists with solid pool fires. Fine water mist was generated by a single pressure nozzle and solid pool fires were produced from solid red pine or polymethyl methacrylate(PMMA). The LDV/APV system was em-ployed to determine the water mist characteristics. The water mist droplet sizes and velocities from the nozzle were measured under varying conditions and at different locations. The effects of solid type, water flow rate, and nozzle distance from the sample surface on extinguishments time were examined. At a given water flow rate, the extinguishment time is much longer for PMMA fires than for solid pine fires. The extinguishment time was found to decrease with increasing water flow rate. At very low water flow, the extinguishment time decreases when the nozzle is positioned further from the sample surface. On the contrary, at high water flow, the extinguishment time appears to be independent of the distance between the nozzle and the sample surface. The experimental re-sults show that flame extinguishments is due primarily to fuel surface cooling and wetting.This paper describes experimental study of the interaction of fine watermists with solid pool fires. Fine water mist was generated by a single pressure nozzle and solidpool fires were produced from solid red pine or polymethyl methacrylate(PMMA). The LDV/APV systemwas employed to determine the water mist characteristics. The water mist droplet sizes andvelocities from the nozzle were measured under varying conditions and at different locations. Theeffects of solid type, water flow rate, and nozzle distance from the sample surface onextinguishments time were examined. At a given water flow rate, the extinguishment time is muchlonger for PMMA fires than for solid pine fires. The extinguishment time was found to decrease withincreasing water flow rate. At very low water flow, the extinguishment time decreases when thenozzle is positioned further from the sample surface. On the contrary, at high water flow, theextinguishment time appears to be independent of the distance between the nozzle and the samplesurface. The experimental results show that flame extinguishments is due primarily to fuel surfacecooling and wetting.

关 键 词：water mist  SOLID POOL fire  MIST characteristics  extinguishment time. 

分 类 号：X932[环境科学与工程—安全科学]