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A platform for research: civil engineering, architecture and urbanism
Water mist is increasingly being used as a fire suppressant, replacing environmentally harmful halon compounds. There are now dozens of companies worldwide that offer various forms of water-mist fire-protection systems. There has been relatively little research to explain the fundamental physical, thermal, and chemical interactions between water mists and flames. Modeling is used as a means to characterize the structure and the extinction of premixed, freely propagating, methane-air flames, with fine water mists in the unburned mixture. The model and the computational algorithm must accomodate strong coupling between the droplet dynamics and the gaseous flow. The gas-phase conservation equations, which include elementary chemistry, are discretized and solved on an adaptive Eulerian mesh, while the droplet dynamics are represented in a Lagrangian framework. A modified arclength-continuation method is used to follow the solutions through the extinction turning point and thus predict flame-extinction limits. The model predicts how burning velocity and extinction conditions depend on droplet size and number density. The results compare very favorably with previously published theoretical analyses.
Water mist is increasingly being used as a fire suppressant, replacing environmentally harmful halon compounds. There are now dozens of companies worldwide that offer various forms of water-mist fire-protection systems. There has been relatively little research to explain the fundamental physical, thermal, and chemical interactions between water mists and flames. Modeling is used as a means to characterize the structure and the extinction of premixed, freely propagating, methane-air flames, with fine water mists in the unburned mixture. The model and the computational algorithm must accomodate strong coupling between the droplet dynamics and the gaseous flow. The gas-phase conservation equations, which include elementary chemistry, are discretized and solved on an adaptive Eulerian mesh, while the droplet dynamics are represented in a Lagrangian framework. A modified arclength-continuation method is used to follow the solutions through the extinction turning point and thus predict flame-extinction limits. The model predicts how burning velocity and extinction conditions depend on droplet size and number density. The results compare very favorably with previously published theoretical analyses.
The effect of monodispersed water mists on the structure, burning velocity, and extinction behavior of freely propagating, stoichiometric, premixed, methane-air flames
Der Einfluss von monodispergierten Wassernebeln auf Struktur, Brenngeschwindigkeit und Löschungsverhalten von offenen, stöchiometrischen, vorgemischten Methan-Luft-Flammen
Combustion and Flame ; 130 ; 322-335
2002
14 Seiten, 10 Bilder, 36 Quellen
Article (Journal)
English
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