The influence of fluorinated hydrocarbons on the combustion of gaseous mixtures in a closed vessel

Chemical Transformations in Inhibited Flames over Range of Stoichiometry

“…The effect of various fire suppressants and inhibitors (chlorofluorohydrocarbons, bromine-containing hydrocarbons) on the FCLs of hydrocarbon-oxygen mixtures has been studied earlier (Saito et al, 1995;Shebeko et al, 2000) but the effect of OPCs have not been examined. Investigation of the inhibitors (including OPCs) influence on the FCLs allows, on the one hand, to evaluate the possibilities of their use as fire suppressants, and, on the other hand, to validate the inhibition mechanism by comparing experimental and modeling results.…”

“…Furthermore, the addition of TMP reduces the upper limit two times more effectively than the addition of CF 3 Br. It is known that many flame inhibitors, such as fluorinated hydrocarbons (for example, CF 3 Br), influence the upper and lower concentration limits differently: they reduce the upper limit more strongly and increase the lower limit less strongly (Saito et al, 1995;Shebeko et al, 2000). This effect is due mainly to the fact that the addition of an inhibitor to a combustible mixture leads to a change in the equivalence ratio, and, thus, to a reduction in both concentration limits for methane, and, as result, to different effectiveness of the additive for the upper and lower limits.…”

Effect of trimethylphosphate additives on the flammability concentration limits of premixed methane-air mixtures

“…It is known that many flame inhibitors, such as fluorinated hydrocarbons (for example, CF 3 Br), influence the upper and lower concentration limits differently: they reduce the upper limit more strongly and increase the lower limit less strongly [13,14]. This effect is due mainly to the fact that the addition of an inhibitor to a combustible mixture leads to a change in the equivalence ratio, and, thus, to a reduction in both concentration limits for methane, and, as result, to different effectiveness of the additive for the upper and lower limits.…”

“…One of the important combustion characteristics of premixed mixtures are flammability concentration limits (FCLs). The effect of various fire suppressants and inhibitors (chlorofluorohydrocarbons, bromine-containing hydrocarbons) on the FCLs of hydrocarbon-oxygen mixtures has been studied previously [13,14] but the effect of organophosphorus compounds has not been examined. Investigation of the effect of inhibitors (including OPCs) on the FCLs allows one, on the one hand, to evaluate the possibilities of their use for fire suppression, and, on the other hand, to determine the inhibition mechanism by comparing experimental data and results of numerical modeling using detailed kinetics.…”

Thermodynamic Analysis of Suppressant-Enhanced Overpressure in the FAA Aerosol Can Simulator

“…The results varied with fuel type, stoichiometry, agent type, and the presence or absence of turbulence-inducing spirals. In tests with a constant volume, closed vessel combustion device, Shebeko et al [8] found that various fluorinated inhibitors can enhance the combustion, creating both higher final pressures as well as higher rates of pressure rise, for hydrogen-or methane-air mixtures, under fuel-lean conditions. In shock heated mixtures of fuel, oxygen and argon, Moriwaki and co-workers [9][10][11][12] found that halomethanes (CH 3 Cl, CH 3 Br, CH 3 I), as well as CF 3 Br, promote methane ignition (i.e., lower the ignition delay), but inhibit ethane ignition.…”