Experimental Study of Temperature Distribution of Pool Fires Flames Extinguished by Water Mist in Confined Space

Abstract：Experimental observation on temperature distribution and flame structure in the course of extinguishing pool fire by water mists in confined space was conducted by using IR (Infrared) thermograph technique.The result indicated that in the pool fire flames there are three regions, namely core reaction region, ventilation-controlled region and fuel-controlled region, and the thermographs showed that the combustion was strengthened when water mists were applied suddenly, for which the possible reason was that the combustion of fuel was quickened by turbulence.With the successive application of water mists, turbulence of flame enhanced and discontinuous zone extended.Meanwhile, high temperature zones reduced gradually until fire extinguishments along with the vaporization of water mists.

Keyword：water mist;pool fire;IR technique;temperature field;flame structure;