Mathematical modeling of external heat load on the fireman during combustion of liquid oil products in reservoirs

T. V. Kostenko, S. V. Pozdyeyev, O. L. Zav’Yalova, V. K. Kostenko, D. A. Zurbinskiy

Abstract


Abstract. Purpose is the analysis of conditions and factors that determine extreme values of the heat load on the rescuer during combustion of fire in reservoirs with oil products based on mathematical modeling of the thermodynamic processes in the system "thermal energy source - space around the fire - protective clothing - human body" using the finite element method. With the help of ANSYS 9.0 validated and studied the role of factors that significantly affect the temperature distribution in the system. A new approach to modeling is the totality of the elements of the system that combining into a single chain of processes from the combustion source to the surface body rescuer taking into account the properties of the environment, protective clothing and etc. For detailed analysis were constructed temperature distributions on the outer and inner surfaces of the protective equipment and on the body surface. Two variants of placing the body of the rescuer near the source of combustion are considered, namely, standing and lying. The distribution of temperature along the surface of the soil in the radial direction from the reservoir was obtained in the 20th minute of the continuation of the developed fire. This allowed to study the dependence of the maximum temperature and time of heating the body surface of the firefighter-rescuer from the distance to the reservoir with a fire. When analyzing the obtained calculated dependences for smoothing the obtained data, regression dependences for the parameters that characterizing fire hazard thermal influence over the reservoir for fire-fighters – maximum body surface temperature and heating time to reach the critical temperature of the body surface, depending on the distance to the reservoir with fire. In the most dangerous area for the researched positions (standing and lying) of his body established dependences of the maximum temperature of heating the body surface of the firefighter-rescuer and the time to reach the critical temperature from the degree of blackness of the soil surface. To construct a mathematical model of the influence of a complex of factors on the body of a firefighter-rescuer, a complete factor experiment was carried out. The matrix of the experiment was planned and developed, simulation was realized and regression equations were obtained describing the mechanism of heat propagation in the system. The estimation of the modeling error, the relative deviation does not exceed 5,3%. The results will be used to develop practical recommendations for the prevention and preliminary preparation of rescue units for the combustion of fires in reservoir parks.

Keywords


mathematical modeling; full factorial design; external heat load of the rescuer; the critical temperature of the body; the time of protective action

References


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 Стаття поступила до редколегії 26.04.2017 
 



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