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- W2080511050 abstract "The investigations of Townend and co-workers (1934) have revealed that the spontaneous ignition of higher paraffins in admixture with air consists in certain temperature ranges usually between 270 and 400°C., of a two-stage process, preceded by a time interval t 1 prior to the appearance of a cool flame, and a subsequent interval t 2 before the occurrence of normal ignition. The reactions involved may be indicated as proceeding from A → B → C , Where B denotes the rapid formation of intermediate products by the passage of a cool flame. Above and below this temperature range the ignitions are no longer composite and after a time interval t appear to result directly from the process A → C . Apart from their intrinsic interest, these results have a practical bearing on the problem of knock in internal combustion engines. For, whereas the minimum pressures for ignition in the cool flame region of the paraffins and olefins containing more than three carbon atoms have been shown to be related to their knocking propensities in engine practice, non-knocking fuels such as methane have failed to reveal any cool flame systems at all, even at pressures up to 30 atm. While the precise mechanism of knock is as yet not entirely understood, it is generally recognized that the phenomenon arises as the outcome of the passage of an explosion flame through a fuel-air mixture which has attained a state of enhanced chemical reactivity (cf. Egerton and co-authors 1938)." @default.
- W2080511050 created "2016-06-24" @default.
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- W2080511050 date "1938-07-07" @default.
- W2080511050 modified "2023-10-18" @default.
- W2080511050 title "The two-stage auto-ignition of hydrocarbons and knock" @default.
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- W2080511050 doi "https://doi.org/10.1098/rspa.1938.0119" @default.
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