On the relationship between the sprinkler geometric parameters, stability and expansion rate of the generated foam

Authors

  • Aleksey O. Likhomanov State Educational Establishment «University of Сivil Protection of the Ministry for Emergency Situations of the Republic of Belarus»; 220118, Belarus, Minsk, ul. Mashinostroiteley, 25 https://orcid.org/0000-0002-9374-1486
  • Eduard G. Govor State Educational Establishment «University of Сivil Protection of the Ministry for Emergency Situations of the Republic of Belarus»; 220118, Belarus, Minsk, ul. Mashinostroiteley, 25 https://orcid.org/0000-0002-4040-3264
  • Andrey N. Kamlyuk State Educational Establishment «University of Сivil Protection of the Ministry for Emergency Situations of the Republic of Belarus»; 220118, Belarus, Minsk, ul. Mashinostroiteley, 25 https://orcid.org/0000-0002-9347-0778

DOI:

https://doi.org/10.33408/2519-237X.2021.5-2.174

Keywords:

automatic extinguishing system, sprinkler, foam, foam expansion rate, foam stability, geometric parameters of sprinkler, deflector working surface coefficient of sprinkler

Abstract

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 %)).

Author Biographies

Aleksey O. Likhomanov, State Educational Establishment «University of Сivil Protection of the Ministry for Emergency Situations of the Republic of Belarus»; 220118, Belarus, Minsk, ul. Mashinostroiteley, 25

Chair of Automatic System Security, Lecturer

Eduard G. Govor, State Educational Establishment «University of Сivil Protection of the Ministry for Emergency Situations of the Republic of Belarus»; 220118, Belarus, Minsk, ul. Mashinostroiteley, 25

Department of Scientific and Innovation Activity, Researcher

Andrey N. Kamlyuk, State Educational Establishment «University of Сivil Protection of the Ministry for Emergency Situations of the Republic of Belarus»; 220118, Belarus, Minsk, ul. Mashinostroiteley, 25

Deputy Chief of the University on Scientific and Innovative Activity; PhD in Physical and Mathematical Sciences, Associate Professor

References

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Published

2021-05-25

How to Cite

Likhomanov А. О., Govor Э. Г. and Kamlyuk А. Н. (2021) “On the relationship between the sprinkler geometric parameters, stability and expansion rate of the generated foam”, Journal of Civil Protection, 5(2), pp. 174–185. doi: 10.33408/2519-237X.2021.5-2.174.

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Section

Fire and industrial safety (technical sciences)

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