Affiliation:
1. Institute of Public Administration and Research in Civil Protection
2. National University of Civil Defence of Ukraine
Abstract
The prototype of the compressed air foam system was improved based on the evaluation of the numerical parameters obtained with the help of the developed mathematical model of the foam generation process and the pneumatic-hydraulic scheme. The prototype provides the possibility of foam generation both in autonomous mode, due to the installation of cylinders with compressed gas, and in stationary mode, due to the supply of compressed air from an external source. This allows the use of an improved model of the compressed air foam system both in stationary mode (dry pipes, gas stations, etc.) and for use on heavy and light fire trucks, which is important for large cities. Testing of the improved prototype of the system for extinguishing model fires was carried out. The system provides extinguishing of model fires of class 183 B and 144 B when using both a general-purpose foaming agent and a special film-forming foaming agent. When using a film-forming foaming agent, the extinguishing time was reduced by 1.75 times, the consumption of fire extinguishing solution by 1.47 times. But at the same time, it should be taken into account that the cost of the film-forming foaming agent Sofir (sofirafff 6 %) is more than 3.2 times the cost of the general-purpose foaming agent Sofir. The effectiveness of the improved model in extinguishing class A fires was also confirmed. The autonomous compressed air foam system ensures extinguishing of a class 4 A model fire in 90 seconds. Dry foam with a factor of 14 is noted to be more effective in extinguishing solid combustible substances.
Publisher
Trans Tech Publications, Ltd.
Subject
Anesthesiology and Pain Medicine
Reference35 articles.
1. I. Abduragimov, On the problem of extinguishing large fires of solid combustible materials in buildings within the city, Fire and explosion safety, 2 (2012) 75–78.
2. D. Korolchenko, A. Sharovarnikov, Analysis of the dual mechanism of flame extinguishing. Fire and Explosion Safety. Special issue, (2014) 114–123.
3. D. Dubinin, K. Korytchenko, A. Lisnyak, I. Hrytsyna, V. Trigub, Improving the installation for fire extinguishing with finelydispersed water, Eastern-European Journal of Enterprise Technologies, 2 (2018) 38–43.
4. A. Semko, M. Beskrovnaya, S. Vinogradov, I. Hritsina, N. Yagudina, The usage of high-speed impulse liquid jets for putting out gas blowouts, Journal of Theoretical and Applied Mechanics, 3 (2014) 655–664.
5. The use of pulsed high-speed liquid jet for putting out gas blow-out;Semko;The International Journal of Multiphysics