The burning velocity of methane-air flames inhibited by methyl bromide

✍ Scribed by H. Edmondson; M.P. Heap

• Publisher: Elsevier Science
• Year: 1969
• Tongue: English
• Weight: 799 KB
• Volume: 13
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(69)90086-8

✦ Synopsis

A nozzle burner, schlieren cone angle method of burning velocity de'~ermination, involving measurement of unburnt gas velocity under flame conditions, has been develoy~l to permit precise measurements of the burning velocity of inhibited flames. Data for methane-air flames inl~bited by methyl bromide indicate the following significant features: (!) Addition of methyl bromide causes a shift of maximum burning velocity towards leaner ~nditions;

(2) The effectiveness cf methyl bromide as an inhibitor increases as the methane content of the mixture increases;

(3) Successive, equal additions of methyl bromide causes progressively smaller reductions in burning velocity.

These features are shown to be consistent with the inhibition mechanism proposed by Rosser, Wise and Miller: decomposition of methyl bromide is considered to ~ p,,¢tically complete prior to combustion and inhibition is considered to depend on removal, by bromine substitution, of chain carriers essential to the critical stages of combustion. The alternative chain breaking/chain branching competition mechanism of inhibition has not yet been developed sufficiently to permit a reasonable comparison between predicted and measured trends in burning velocity.