Y. Jiang, J. T. An, R. Qiu, Y. Hu and N. Zhu (2013) Improved understanding of fire suppression mechanism with an idealized extinguishing agent. Journal/International Journal Of Thermal Sciences 64 22-28. [In English]
Web link: http://dx.doi.org/10.1016/j.ijthermalsci.2012.08.004
Keywords: Fire suppressants, Diffusion flames, One-dimensional turbulence (ODT), model, Kinetic modeling, ONE-DIMENSIONAL TURBULENCE, CONDITIONAL MOMENT CLOSURE, JET DIFFUSION, FLAMES, IRON PENTACARBONYL, MODEL FORMULATION, INHIBITION, RANGE, FLOWS
Abstract: An idealized extinguishing agent with two main inhibition mechanisms including recombination of radicals and HO2 destruction was designed to test the chemistry of hydrogen flame extinguishment. The One-Dimensional Turbulence (ODT) model was used to perform an in-depth analysis on the role of turbulence-chemistry interaction in flame suppression. The results show that fire suppression effect is generally significant under a higher Reynolds number due to the increasing global mixing rate. The Reynolds-averaged mean and rms of the chain-carrying radical are very sensitive to the agents. Furthermore, it is shown that the differential diffusion effects are strong in the near field. The numerical results also show that a higher global mixing rate would lead to the high discrepancy of flame temperature in the near-field, and flame temperature appeared to be unaffected by the different mixing rate in the far-field. Increasing the global mixing rate will lead to larger extinguished regions even without addition, and extinction mainly occurs in the near-field, the local extinction is a rapid process while the reignition of the extinguished mixture is slow. (C) 2012 Elsevier Masson SAS. All rights reserved.