ESTIMATING THE INFLUENCE OF THE WIND EXPOSURE ON THE MOTION OF AN EXTINGUISHING SUBSTANCE

• Yuriy Abramov National University of Civil Defence of Ukraine
• Oleksii Basmanov National University of Civil Defence of Ukraine
• Valentina Krivtsova National University of Civil Defence of Ukraine
• Andrii Khyzhnyak Cherkasy Institute of Fire Safety named after Chornobyl Heroes of National University of Civil Defence of Ukraine
Keywords: wind action, equation of dynamics, movement trajectory of a fire extinguishing agent, water jet

Abstract

One of the tasks to be solved when deploying fire extinguishing systems is to determine the range of the fire extinguishing agent supply to the combustion center. This problem is solved using data on the trajectory of the fire-extinguishing agent in the combustion center. The presence of wind impact on the process of supplying a fire extinguishing agent will lead to a change in its trajectory. To take into account wind impact, it becomes necessary to assess the result of such impact. Using the basic equation of dynamics for specific forces, a system of differential equations is obtained that describes the delivery of a fire extinguishing agent to the combustion center. The system of differential equations takes into account the presence of wind impact on the movement of the extinguishing agent. The presence of wind action is taken into account by the initial conditions. To solve such a system, the integral Laplace transform was used in combination with the method of undefined coefficients. The solution is presented in parametric form, the parameter of which is time. For a particular case, an expression is obtained that describes the trajectory of the supply of the extinguishing agent into the combustion center. Nomograms are constructed, with the help of which the operative determination of the estimate of the maximum range of the fire-extinguishing agent supply is provided. Estimates are obtained for the time of delivery of a fire-extinguishing agent to the combustion center, and it is shown that for the characteristic parameters of its delivery, this value does not exceed 0.5 s. The influence of wind action on the range of supply of a fire extinguishing agent is presented in the form of an additive component, which includes the value of the wind speed and the square of the time of its delivery. To assess the effect of wind impact on the movement of the fire extinguishing agent, an analytical expression for the relative error was obtained and it was shown that the most severe conditions for supplying the fire extinguishing agent to the combustion center, the value of this error does not exceed 5.5%. Taking into account the wind effect when assessing the range of supply of a fire-extinguishing agent makes it possible to increase the efficiency of fire-extinguishing systems due to its more accurate delivery to the combustion center

Author Biographies

Yuriy Abramov, National University of Civil Defence of Ukraine

Research Center

Oleksii Basmanov, National University of Civil Defence of Ukraine

Department of Problems of Civil Protection and Technogenic-Ecological Safety of the Research Center

Valentina Krivtsova, National University of Civil Defence of Ukraine

Department of Physical and Mathematical Disciplines

Andrii Khyzhnyak, Cherkasy Institute of Fire Safety named after Chornobyl Heroes of National University of Civil Defence of Ukraine

Department of Automatic Safety Systems and Electrical Installations

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Published
2020-09-30
How to Cite
Abramov, Y., Basmanov, O., Krivtsova, V., & Khyzhnyak, A. (2020). ESTIMATING THE INFLUENCE OF THE WIND EXPOSURE ON THE MOTION OF AN EXTINGUISHING SUBSTANCE. EUREKA: Physics and Engineering, (5), 51-59. https://doi.org/10.21303/2461-4262.2020.001400
Issue
Section
Engineering