FORMALIZATION OF BOUNDARY CONDITIONS FOR MODELS AND ALGORITHMS OF FIRE IDENTIFICATION PROBLEM

Denisov Alexei Nikolaevitch, Nguyen Thee Tai

Introduction. Complications at extinguishing fires in reservoirs are caused by poor attention to the planning of fire management at the initial stage of a fire. The primary strategy for managing mobile firefighting assets when extinguishing fires at these facilities is to implement the deferred attack method - failure to extinguish the fire at the initial stage of the fire. Aims and objectives. To verify the models and algorithms of the task of identifying the situations developing on the place of fire, developed by the authors. To carry out experimental research (simulation) of the boundary conditions for the model and algorithms, published by the authors in 2022. Experimentally justify the possibility of extinguishing fires in tanks with oil and petroleum products with water. Methods. Methods of similarity theory and laboratory modeling, physical experiment, observation, comparison, finding empirical dependencies based on the mathematical processing of experimental data, description, generalization. Results and their discussion. Specialized test benches with models of vertical tanks (for fire and hydraulic tests) have been created. The parameters of replaceable nozzles of fire-extinguisher models have been selected to simulate the cooling and extinguishing of burning tanks. Water was used as the extinguishing agent; gasoline and light crude oil were used as the combustible liquid. Experiments on stoking the flame in the model of a vertical tank with crude light oil with water were successful. A number of boundary conditions for models and algorithms of the problem of identification of situations on the site of the fire have been formalized. Conclusions. When planning the management of combat operations in reservoirs with light crude oil to implement the method of immediate attack, not to cool the tank(s), and immediately proceed to extinguish the burning tank. Experimentally justified the possibility of extinguishing fires in tanks with crude light oil with water, with gasoline was not possible. A number of boundary conditions for the models and algorithms of the fire identification problem are formalized, among which are: the ratio of the spot area of the water jet on the liquid surface to the area of the tank model when supplying hinged jets is up to 10 %; the minimum time for stopping the flame in the burning tank model by the fire-barrel model that supplies water by hinged jets is 350 s, on average; the water consumption for stopping the flame - 864 l/c is determined.

Keywords:algorithm, boundary conditions, immediate attack method, delayed attack method, model, planning, fire suppression, tank, control, experiment