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A TECHNIQUE WAS DEVELOPED TO OBTAIN TIME- AND SPATIALLY-RESOLVED GAS SAMPLES FROM THE DEVELOPMENT VOLUME OF A RECIPROCATING ENGINE. The technique was used to investgate the distribution of fuel and products of combustion, with emphasis on the sources and formation mechanisms of gaseous hydrocarbons, in a single cylinder -141 TCP engine. A mathematical model predicted the actual sample gas origin, relative to the instantaneous sampling orifice position, as a function of the local gas motion and properties. Samples were taken at times ranging from 30 deg CA BTDC to 60 deg CA ATDC. Gas chromatography gave the sample composition, including the concentration versus carbon number distribution of the hydrocarbons. Local stoichiometry, local reactant hydrogen/carbon ratio and apparent local particulate concentration were also calculated. Significant vertical stratification persists in the L-141 TCP combustion chamber as late as 60 deg CA ATDC, indicating that mixing in the vertical direction in the central part of the chamber is inhibited by solid body rotation of the gases. Exhaust hydrocarbons consisted primarily of heptane, probably originating from the bowl surface, and species having two carbon atoms. Total hydrocarbons and the relative proportion of heptane to C2 species decreased with increasing load, because of the higher gas temperatures. (Author).
Beginning in 1985, one section is devoted to a special topic
This book contains the proceedings of the International Symposium on Alternative and Advanced Automotive Engines, held in Vancouver, B.C., on August 11 and 12, 1986. The symposium was sponsored by EXPO 86 and The University of British Columbia, and was part of the specialized periods program of EXPO 86, the 1986 world's fair held in Vancouver. Some 80 attendees were drawn from 11 countries, representing the academic, auto motive and large engine communities. The purpose of the symposium was to provide a critical review of the major alternatives to the internal combustion engine. The scope of the symposium was limited to consideration of combustion engines, so that electric power, for example, was not considered. This was not a reflec tion on the possible contribution which electric propulsion may make in the future, but rather an attempt to focus the proceedings more sharply than if all possible propulsion systems had been considered. In this way all of the contributors were able to participate in the sometimes lively discussion sessions following the presentation of each paper.
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