On the relationship between the sprinkler geometric parameters, stability and expansion rate of the generated foam
Keywords:automatic extinguishing system, sprinkler, foam, foam expansion rate, foam stability, geometric parameters of sprinkler, deflector working surface coefficient of sprinkler
Purpose. To analyze the influence of geometric parameters of the deflector type sprinkler on the expansion rate and stability of generated air-mechanical foam and to study the relationship between the expansion rate and the stability of low expansion foam generated in deflector type sprinklers for synthetic general-purpose foaming agents and wetting agents.
Methods. Theoretical research methods (analysis, synthesis and systematization) were used. To study the relationship between the expansion rate and the stability of low expansion foam the experiments were carried out, and the methods of regression and statistical analyzes for the mathematical description of the established relationship were used.
Findings. The geometric parameters of the frame arms and deflector of the sprinkler that affect the expansion rate and stability of generated foam were defined. The optimal values of these geometric parameters to obtain foam with increased expansion rate and stability were analyzed. The expression for determining the working surface coefficient Ks of the cone-shape deflector of the sprinkler was obtained. It was found that the previously revealed linear nature of the dependence of foam stability on foam expansion rate for the PO-6RZ (6 %) foaming agent is also typical for other foaming agents, in particular for the synthetic general-purpose foaming agent Sintek-6NS (6 %) and the wetting agent OPS-0.4 (1 %).
Application field of research. The expression for determining the working surface coefficient Ks of the cone-shape deflector of the sprinkler can be widely used in the development of new deflector type sprinklers for automatic extinguishing systems, as well as for the modernization of their design. In addition, the obtained expression for the dependence of foam stability on its expansion rate can be used to calculate the unknown value of these qualitative characteristics of foam, knowing the value of one of them (for the synthetic general-purpose foaming agent Sintek-6NS (6 %) and the wetting agent OPS-0.4 (1 %)).
Ahrens M. U.S. Experience with sprinklers. Quincy: NFPA Research, 2017. 35 p.
Romantsov I.I., Chaldaeva E.I. Effektivnost' ispol'zovaniya zhidkofaznykh ognetushashchikh sostavov na ob"ektakh energetiki [Efficiency of using liquid-phase fire-extinguishing compositions at power engineering facilities]. Proc. XXI All-Russian scientific-technical conf. «Energy: efficiency, reliability, safety», Tomsk, December 2–4, 2015. Tomsk: SKAN, 2015. Vol. 2. Pp. 160–164. (rus)
Kamlyuk A.N., Grachulin A.V. Kompressionnaya pena dlya nuzhd pozharnykh podrazdeleniy [Compression foam for the needs of fire departments]: monograph. Minsk: University of Civil Protection, 2019. 224 p. (rus)
Kamlyuk A.N., Likhomanov A.O. Eksperimental'nye issledovaniya vliyaniya konstruktivnykh elementov orositeley na kratnost' vozdushno-mekhanicheskoy peny [Experimental investigations of the influence of the structural elements of sprinklers on the expansion rate of air-mechanical foam]. Journal of Civil Protection, 2017. Vol. 1, No. 2. Pp. 167–177. (rus). DOI: https://www.doi.org/10.33408/2519-237X.2017.1-2.167.
Likhomanov A.O., Govor E.G., Kamluk A.N. Obosnovanie primeneniya rozetochnykh orositeley, izgotavlivaemykh pri pomoshchi additivnykh tekhnologiy, v eksperimental'nykh issledovaniyakh kachestvennykh kharakteristik vozdushno-mekhanicheskoy peny nizkoy kratnosti [The substantiation of the application of deflector sprinklers manufactured by additive technologies in experimental studies of qualitative characteristics of the low-expansion air-mechanical foam]. Journal of Civil Protection, 2018. Vol. 2, No. 1. Pp. 25–39. (rus). DOI: https://www.doi.org/10.33408/2519-237X.2018.2-1.25.
Kamlyuk A.N., Likhomanov A.O. Eksperimental'noe opredelenie ratsional'nykh geometricheskikh parametrov derzhatelya i razbryzgivatelya orositelya po kratnosti i ustoychivosti peny [Experimental determination of the rational geometrical parameters of the sprinkler frame arms and deflector on the expansion rate and stability of foam]. Proceedings of the National Academy of Sciences of Belarus. Physicaltechnical series, 2019. Vol. 64, No. 1. Pp. 60–68. (rus). DOI: https://www.doi.org/10.29235/1561-8358-2019-64-1-60-68.
Likhomanov A.O., Kamlyuk A.N. Matematicheskaya model' prognozirovaniya kratnosti peny v zavisimosti ot geometricheskikh parametrov rozetochnykh orositeley [Mathematical model for predicting foam expansion rate depending on the geometrical parameters of deflector type sprinkler]. Nauchnye i obrazovatel'nye problemy grazhdanskoy zashchity, 2019. Vol. 41, No. 2. Pp. 27–38. (rus)
Kamlyuk A.N., Likhomanov A.O. Innovatsionnye podkhody pri optimizatsii konstruktsii pennykh pozharnykh orositeley s pomoshch'yu additivnykh tekhnologiy [Innovative way to optimize the design of foam fire sprinklers with the help of additive technologies]. News of Science and Technologies, 2018. Vol. 46, No. 3. Pp. 53–59. (rus)
Likhomanov A.O., Kamlyuk A.N., Grachulin A.V. Eksperimental'noe opredelenie effektivnosti tusheniya pozhara klassa B penoy nizkoy kratnosti, generiruemoy rozetochnymi orositelyami [Experimental determination of the Class B fire extinguishing efficiency using low-expansion foam generated by deflector type sprinklers]. Journal of Civil Protection, 2020. Vol. 4, No. 3. Pp. 251–264. (rus). DOI: https://www.doi.org/10.33408/2519-237X.2020.4-3.251.
Kamluk A.N., Likhomanov A.O. Increasing foam expansion rate by means of changing the sprinkler geometry. Fire Safety Journal, 2019. Vol. 109. Pp. 102862-1–102862-8. DOI: https://www.doi.org/10.1016/j.firesaf.2019.102862.
Kamluk A.N., Likhomanov A.O., Grachulin A.V. Field testing and extinguishing efficiency comparison of the optimized for higher expansion rates deflector type sprinkler with other foam and foam-water sprinklers. Fire Safety Journal, 2020. Vol. 116. Pp. 103177-1–103177-10. DOI: https://www.doi.org/10.1016/j.firesaf.2020.103177.
Kamlyuk A.N., Grachulin A.V., Likhomanov A.O., Govor E.G. Sborno-razbornyy drenchernyy orositel' [Collapsible deluge sprinkler]: utility model BY 11801. Published October 30, 2018. (rus)
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