Development of a rapid compression controlled-expansion machine for chemical ignition studies

作者: John Neuman

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摘要: DEVELOPMENT OF A RAPID COMPRESSION CONTROLLED-EXPANSION MACHINE FOR CHEMICAL IGNITION STUDIES John Neuman, B.S.M.E. Marquette University, 2015 The ability to accurately model fuel combustion processes is essential the development of transportation, power generation, and manufacturing technology. Models describing kinetics chemical oxidation are readily available highly refined for a wide range test fuels. However, these models still suffer from high levels uncertainty under engine-relevant conditions, largely due lack consistency between published validation data. An experimental testing apparatus, known as Rapid Compression ControlledExpansion Machine (RCCEM) has been designed fabricated conduct kinetic studies. RCCEM features pneumatically-driven, custom-designed cam, which governs volumetric compression expansion chamber. This machine various ratios, compressed pressures, temperatures. Central operation RCCEM, cam assembly modular with incorporate different cams unique profiles. capability intended control heat loss rates in experiments via expansion, result, increase understanding its influence on interpretation Performance characterization using iso-octane hexane, shown that capable conditions exceptional repeatability. Ignition delay times isooctane reported temperatures 630-700 K. Additionally, two computational fluid dynamics (CFD) studies have conducted investigate role non-uniform boundary potential cause discrepancies among data literature. effect ignition time predictions compressed-gas temperature field investigated heated RCM use either creviced or flat pistons. Three cases non-reactive simulations showed large gradient forms over crown piston heterogeneities present initial fields. Subsequently, five were reactive demonstrated non-uniformities predictions. Through this work, it was determined susceptible causing times, whereas only minimally influenced.

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