EXPERIMENTAL DETERMINATION OF THE SUPPRESSION BURNING MODEL FOREST FIRES OF FINE DROPLET FLOW

In this paper the main attention is paid to a problem of increase of efficiency of fire extinguishing mechanisms with using sprayed water, in particular, to studying of extinguishment times of burning of the model forest fire with use of a fine droplet flow. The optimum sizes of sprayed water droplets, quantity of nozzles and their relative positioning which are required for the effective fire extinguishing are revealed with use of high-speed video registration equipment and panoramic optical methods. The reasons of emergence of the turning phenomenon of sprayed water droplets at extinguishment of ignitions are analyzed. The minimum extinguishment times of burning are defined. Comparison of researches results of single water droplets evaporation processes in the conditions of field tests (with use of model fire group) and when carrying out similar experiments in laboratory was executed. Rather satisfactory compliance of experimental data on liquid evaporation rates is revealed. It is established that systematic errors of measurement of the water droplet sizes were no more than 0.03 mm, random—no more than 5.9 %. The maximum measurement error of extinguishment times didn't exceed 1 sec.