NUMERICAL ANALYSIS OF LIQUID EFFICIENCY UNDER THE IMPACT OF TYPICAL "WATER BOMB" ON FLAME
PURPOSE. The main means of extinguishing and suppressing large-scale fires is the local water discharge from special tanks of airplanes and helicopters into the flame zone. At present there is no theory giving the assessment of liquid mass sufficient for flame localization and further combustion suppression. The article presents numerical analysis of liquid efficiency under the impact of typical sufficiently large water bomb (under different conditions and blow-outs in it) on flame. METHODS. Mathematical model of heat transmission processes includes the system of non-steady differential equations of heat conductivity. At each time step the longitudinal size of the “bomb” and the transverse size of conventional blow-outs were constantly calculated. The transverse size of “bomb” was considered to be constant. The given equations system describes heat transmission at maximum possible velocities of water vapourization in the system concerned. In order to assess the accuracy of numerical simulation results, the persistence verification of difference scheme was accomplished. FINDINGS. We have worked out a new approach to assessing liquid efficiency under the typical conditions of fire extinguishment by “water bombs”. It has been shown that the efficiency of water usage under the typical extinguishment conditions is less than 0,1 %. We have proved the rationalism of water vapourization area increase in the “bomb” by means of spraying. RESEARCH APPLICATION FIELD. These results are important for the research in the field of fire extinguishment and advancement of power efficient technologies of flame localization and suppressing ignition source hazards. CONCLUSIONS. Research results allow to come to the conclusion that it is rational to advance fire extinguishing technology with the help of aviation by means of special spraying extinguishing liquids.