Wyniki wyszukiwania - BazTech

Ograniczanie wyników

1 2025

Znaleziono wyników: 1

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: CFD technology

Sortuj według:

Ogranicz wyniki do:

Evaluation of the fire extinguishing effectiveness of sprinklers in fires of selected flammable materials using computer simulation method

Gałaj Jerzy, Smerdel Bartosz

Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej

2025

Nr 95 (tom 1)

89--122

The main objective of this study was to analyse the feasibility of using PyroSim software to evaluate the extinguishing effectiveness of sprinklers in case of fires involving selected combustible materials, which are often found in modern interiors, such as polyurethane and pinewood. To perform numerical calculations, a geometric model of the computational domain, consisting of a selected room and its furnishings located at the Military University of Technology in Warsaw, was established. This model was parameterised and four thermocouples and two sprinklers were deployed. A numerical model of the combustion reaction of the selected combustible materials was also developed. This model was used to conduct numerical analyses for two selected sprinkler models from The Viking Corporation, Model M, and Grinnell, Model A. HRR fire rate curves, the total heat release curves, and the smoke distributions at 10, 20, 40, and 60 seconds of the fire duration, as well as the room temperature curves at 10, 30, and 60 second were obtained during simulation studies. Furthermore, also presented were the temperaturę curves recorded by the four thermocouples. Analyses of the obtained results enabled the assessment of the extinguishing effectiveness of the selected sprinklers and their impact on the combustion process of selected materials, and thus on the development and spread of fire hazards such as smoke and thermal impact. Based on the analysis, several conclusions have been formulated. It was found that both sprinklers used did not provide complete control of smoke spread, and that the Grinnell sprinklers were more effective in reducing temperature and overall heat release than the Viking sprinklers. Comparing the total heat released after 60 seconds, the Grinnell sprinklers were found to be approximately 40% more efficient than the Viking sprinklers. This is further confirmed by the fact that the maximum temperature recorded by thermocouple No. 1 was approximately 120°C lower during polyurethane combustion and approximately 150°C lower during pine wood combustion for the Grinnell sprinklers. This results from their faster activation due to their lower temperature threshold (57°C for the Grinnell and 68°C for the Viking) and the activation of two sprinklers rather than one within the assumed simulation window. Therefore, it is recommended to use the Grinnell model in situations requiring rapid and effective temperature control.