Effects of octane number on autoignition and knocking phenomena in a stratified mixture View Full Text


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Article Info

DATE

2009-07

AUTHORS

T. Ihara, T. Tanaka, K. Wakai

ABSTRACT

The effects of the fuel concentration gradient and the octane number on the autoignition and knocking phenomena in a stratified mixture were studied experimentally on a using a rapid compression machine using stratified mixtures of air and fuels n-heptane, iso-octane, n-hexane, and n-pentane with different octane numbers (0, 100, 25, and 62, respectively). In the chamber, the lower the vertical location, the richer the fuel concentration of the mixture. The mixture contains no gradient in the horizontal direction. The experimental results show that rapid spread of the flame is caused not by flame propagation but by sequential autoignition. Although ignition delays of a stratified mixture are not dependent on the fuel concentration gradient in the mixture, they are constant as long as mean equivalence ratio is the same, and they decrease with the decreasing mean equivalence ratio. In excess of certain gradient value, the knock intensity is smaller as the gradient becomes larger for all fuels tested regardless of their octane number. More... »

PAGES

428

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10573-009-0053-1

DOI

http://dx.doi.org/10.1007/s10573-009-0053-1

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1013283442


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