Flame speeds of hydrogenairethylene mixtures at high equivalence ratios

✍ Scribed by A.D. Snyder; G.B. Skinner

• Publisher: Elsevier Science
• Year: 1964
• Tongue: English
• Weight: 147 KB
• Volume: 8
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(64)90046-x

✦ Synopsis

carried out in the same vessel the limiting pressures gradually decreased, but the temperature dependence did not change much.

The data obtained, though very approximate due to bad reproducibility, permitted determination of the rate constant for the chain branching reaction 2 from the temperature dependence of the limit. The limit was attained at equal rates of branching and termination. It was assumed that the hydroxyl radicals disappeared at the reactor wall within the diffusion range. It was found that k 2 -7 x 10 ~3 exp ( -18 O00/RT) cm ~/mole sec This constant is some thirty times lower than that calculated from burning velocities. It will be noted, however, that determination of constants is very approximate in both cases, and it would be scarcely justifiable to consider this discrepancy as essential. The authors are rather in favour of assuming the k., values, obtained under very different conditions, as sufficiently close and providing evidence that branching is responsible both for the specific properties of flame and for the limit of self-ignition in the fluorine-water vapour system.