Abstract
Purpose. The success of fire extinguishment directly depends on discharging the necessary and sufficient amount of extinguishing agents onto the fire. Analysis of the characteristics of modern extinguishing agents and the research works in this area has shown that when extinguishing fires at power facilities the application of water is not always appropriate, and the specifics of using other means, such as, for example, compressed air foam, have not been fully studied. The article presents the findings of the research and mathematical modeling of fluid and gas dynamics of compressed air foam through delivery hoses when extinguishing fires at power facilities. Methods. The developed measuring system, programmes and experimental techniques have been applied in the research. Existing accurate models of mathematical evaluation of fluid and gas dynamics parameters of two-phase medium have been applied for numerical modelling. Findings. As a result of experimental study and mathematical modeling pressure loss indicators have been obtained along the hose line length when compressed air foam is supplied in a wide range of expansion from 2 to 20. The relative deviation of results has been no more than 7 %. Research application field. The obtained results and further research have practical significance in improving the efficiency of fire service units in performing firefighting tasks. Conclusions. The conducted research allowed obtaining data and their application in practical activity of firefighting units will make it possible to evaluate the capacity of firefighting units in preparing preliminary planning documents for critical facilities, including power facilities, and increase the efficiency of fire extinguishment.
Published Version
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