On the relationship between the sprinkler geometric parameters, stability and expansion rate of the generated foam
DOI:
https://doi.org/10.33408/2519-237X.2021.5-2.174Keywords:
automatic extinguishing system, sprinkler, foam, foam expansion rate, foam stability, geometric parameters of sprinkler, deflector working surface coefficient of sprinklerAbstract
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 %)).
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