Optimization of the geometry of the flow path of nozzles for the manual firefighting barrel SPRU-50/0.7 to form a compact jet of fire extinguishing agent
DOI:
https://doi.org/10.33408/2519-237X.2023.7-4.370Keywords:
firefighting barrel, nozzle, flow path, compact jet, modeling of fluid movement, flow rate, jet rangeAbstract
Purpose. To develop experimental samples of removable series-connected nozzles with an outlet diameter of 19 (type A) and 13 mm (type B) for the SPRU-50/0.7 manual firefighting barrel and optimize the geometry of its flow path in terms of the range of the compact jet of fire extinguishing agent at a given flow rate. To evaluate the compliance of experimental samples with the requirements of safety standards STB 11.13.14.
Methods. The general methodology of the work included the use of theoretical research methods (analysis, synthesis, comparison). The calculation of the geometric parameters of the flow path of the nozzles was carried out by numerical modeling in Ansys software using the finite element method. The range and flow rate of a compact jet of fire extinguishing agent were determined experimentally using the test method described in STB 11.13.14.
Findings. When numerically modeling the flow path of nozzles to the SPRU-50/0.7 manual firefighting barrel, it was established that to ensure the highest speed and conserve the energy of the water jet at a given pressure (0.45 MPa), inlet (40 mm) and outlet (13 mm) diameters, the flow path should gradually narrow along its entire length without cylindrical sections, and the length of the path should not exceed 200 mm. The range of the compact jet and water flow rate were experimentally determined for six developed sets of experimental samples of nozzles of various geometries. All samples provide the standard compact jet range and water flow in accordance with STB 11.13.14. It has also been established that for each unit of water flow, the greatest range of a compact jet is achieved when using: a set consisting of series-connected nozzles of type A and B with a conoidal flow path 50 mm long each – to ensure a flow rate of at least 2.7 l/s with an outlet diameter 13 mm; nozzle type A with a conical flow path 100 mm long – to ensure a flow rate of at least 7.4 l/s with an outlet diameter of 19 mm. At the same time, it is shown that instead of a set of conoidal nozzles 50 mm long, in practice it is advisable to use conical analogues of the same length due to the insignificant difference between the indicator “compact jet range/water flow rate” (about 3 %).
Application field of research. Development and optimization of nozzles for firefighting barrels to supply a compact jet.
References
Kamlyuk A., Parmon V., Morozov A. Stvol pozharnyy ruchnoy universal'nyy kombinirovannyy s raskhodom do 5 l/s i vozmozh-nost'yu formirovaniya vozdushno-mekhanicheskoy peny [Universal firefighter manual fire barrel combined with a flow rate of up to 5 l/s and the possibility of forming an air-mechanical foam]. Nauchnye i obrazovatel'nye problemy grazhdanskoy zashchity, 2019. No. 1 (40). Pp. 76–85. (rus). EDN: https://elibrary.ru/ZEUEPZ.
Morozov A.A., Kamlyuk A.N., Parmon V.V., Striganova M.Yu. Metody ispol'zovaniya sovremennykh ruchnykh pozharnykh stvolov pri tushenii pozharov [Methods of using modern hand-held fire barrels for fire extinguishing]. Journal of Civil Protection, 2019. Vol. 3, No. 4. Pp. 378–390. (rus). DOI: https://doi.org/10.33408/2519-237X.2019.3-4.378. EDN: https://elibrary.ru/ROWESN.
Marozau A., Tran Duc H., Kamluk A., Parmon V., Striganova M. Pump-hose systems with universal fire barrels for extinguishing buildings. Magazine of Civil Engineering, 2021. No. 3 (103). Article 10305. 9 p. DOI: https://doi.org/10.34910/MCE.103.5. EDN: https://elibrary.ru/ALXOEJ.
Kamlyuk A.N., Parmon V.V., Striganova M.Yu., Shirko A.V., Morozov A.A. Raschet i optimizatsiya geometrii protochnogo kanala pozharnogo stvola s raskhodom do 5 l/s [Calculation and optimization of the geometry of the flow channel at a rate of fire of the barrel to 5 l/s]. Vestnik Komandno-inzhenernogo instituta MChS Respubliki Belarus', 2016. No. 1 (23). Pp. 51–59. (rus). EDN: https://elibrary.ru/VKXNTD.
Frenkel' N.Z. Gidravlika [Hydraulic]: textbook. 2nd ed. Moscow; Leningrad: Gosenergoizdat, 1956. 456 p. (rus)
Lepeshkin A.V., Mikhaylin A.A. Gidravlicheskie i pnevmaticheskie sistemy [Hydraulic and pneumatic systems]: textbook. Ed. by Belenkov Yu.A. Moscow: Publishing Center «Akademiya», 2004. 336 p. (rus)
Kotousov L.S. Measurement of the water jet velocity at the outlet of nozzles with different profiles. Technical Physics, 2005. Vol. 50, No. 9. Pp. 1112–1118. DOI: https://doi.org/10.1134/1.2051447.
Published
How to Cite
License
Copyright (c) 2023 Ryabtsev V.N., Likhomanov A.O., Navrotskiy O.D., Morozov A.A., Kamlyuk A.N., Il'yushonok A.V., Goncharenko I.A., Shkinder O.V.
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
