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Detonation Characteristics of Some of the Fuels Suggested as Standards of Antiknock Quality
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Abstract
WHATEVER method is employed for measuring the detonation characteristics of fuels, some reproducible reference fuel or scale of fuels is needed. Reference fuels are needed to assure dependability of results and to provide a common basis of comparison between different laboratories. The fuels should be of definite chemical composition so that they can be reproduced with certainty at any time.
It is not the function of this paper to recommend the specific fuels that should be selected as standards of antiknock quality, but rather to present quantitative data on the detonation characteristics of some of the individual fuels that have been suggested. Such data are here presented in terms of compression ratio for incipient knock over the entire range of composition from zero to 100-per cent concentration, as determined in admixture with normal heptane.
Normal heptane seems to be the only one of the several fuels included in this survey that has a sufficient degree of tendency to knock to make it suitable to form the lower limit of a scale of antiknock quality consisting of two pure fuels mixed in various proportions, one of low and one of high antiknock quality. Of the fuels from which a selection might be made for the upper limit of such a scale, there are cyclohexane, iso-octane, benzene, toluene and alcohol, each having certain advantages and disadvantages, some of which are discussed.
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