Inhibitor rankings for alkane combustion

Citation
V. Babushok et W. Tsang, Inhibitor rankings for alkane combustion, COMB FLAME, 123(4), 2000, pp. 488-506
Citations number
64
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Mechanical Engineering
Journal title
COMBUSTION AND FLAME
ISSN journal
0010-2180 → ACNP
Volume
123
Issue
4
Year of publication
2000
Pages
488 - 506
Database
ISI
SICI code
0010-2180(200012)123:4<488:IRFAC>2.0.ZU;2-Z
Abstract
The effect of hydrocarbon fuel type on the ranking of inhibitor effectivene ss has been investigated through computer simulations. The approach involve s carrying out sensitivity analysis on the detailed kinetics of the combust ion of C-1-C-4 hydrocarbons. Tt is demonstrated that the main reactions det ermining burning velocities are the same. Similar suppressant rankings from the combustion of different hydrocarbon fuels are largely due to the react ions of a number of small radicals that are common to ail of these systems. Inhibitor addition reduces the concentration of these radicals with the ac tive agents being recycled by the common breakdown products of the fuel. In hibitor effectiveness of additives in a variety of fuels was analyzed using experimental data on the effects of additives on burning velocity in small additive concentration ranges. An universal ranking of additive efficiency is presented. The results demonstrate that the active agents in practicall y all cases are the small inorganic compounds created from decomposition pr ocesses. Inhibition effectiveness of agents is at a maximum at low concentr ations. At higher concentrations, saturation effects, brought about by the approach of active radicals to their equilibrium concentrations, lead to su bstantial decreases in the effectiveness of high efficiency suppressants in comparison with their effects at small concentrations. The results show th at the probable maximum increase in total flame suppression effectiveness o f high efficiency agents will not exceed one order of magnitude in molar fr actions in comparison with the effect of halon 1301 (CF3Br). (C) 2000 by Th e Combustion Institute.