Abstract
Currently, there is progressive use of fire protection systems that use the high-pressure water mist. The extinguishing effect of water mist on flammable liquids is not sufficiently elucidated. Therefore, experiments were designed to gain new knowledge about the mechanism of the high-pressure water mist extinguishing.As a source of the pool fire, gasoline, kerosene, diesel and ethanol were used. Flammable liquids were stored in a circular steel container with a diameter of 165mm and a depth of 12mm. The container was placed in an enclosed room of 2.7 x 2.7m x 3m. In the experiment, the time to extinguish flammable liquids was measured using nozzles of different spray characteristics of the water mist. The nozzles with orifice 400 µm, 800 µm and 1000 µm were used at a constant pressure of 70 bar.
Highlights
Many types of transport use automatic fire protection systems
The experiment focused on determining the time to extinguish the flammable liquids with water mist using various kinds of nozzles
A pump with a working pressure of 70 bars, the pipe system and various nozzles were used for creating the water mist
Summary
Many types of transport use automatic fire protection systems (e.g. locomotives, aircrafts etc.). In measuring the heat flux and temperature, authors were set to calculate the effectivity of extinguishing with reference to various working pressures (4-10 bars) on the mist system and various distances of the nozzle from the test container They concluded from the results obtained, that the greater the distance of the nozzle from the fuel, the harder it is to extinguish the fire (especially during the pressure being below 6 bars). They found out that extinguishing kerosene could be easier than extinguishing ethanol, under the condition that the water mist has a greater mass loading and a higher momentum of droplets. The aim of experiment, presented in this article, was to determine the extinguishing time of ethanol, kerosene, gasoline and diesel using water mist
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