Quantitative description of the mechanisms of formation of low multiplicity air-mechanical foam for firefighting needs
DOI:
https://doi.org/10.33408/2519-237X.2024.8-3.276Keywords:
foam, bubble diameter, bubble blowing speed, bubble whipping speed, multiplicity, stability, dispersion, gas content, ejector, mesh, sprinklerAbstract
Purpose. To theoretically evaluate the influence of various factors on the generation of air-mechanical foam obtained in fire extinguishing devices. To compare the obtained data with the results of experimental studies.
Methods. Theoretical and empirical methods of analysis were used in the research process.
Findings. As a result of calculations, the data on the limiting (minimum and maximum) speeds for the liquid flow were obtained, in the range of which the generation of low-expansion air-mechanical foam is ensured for a wide class of foam-generating devices. The mechanisms of foam generation on grids in nozzles of fire trunks by the blowing method, on the surface of foam sprinkler rosettes of automatic fire extinguishing systems by the whipping method, and also by introducing air into the mixing chamber are considered.
Application field of research. The results of the analysis can be used in the development of foam-generating devices, as well as to determine the optimal modes of their operation.
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