Large-Eddy Simulation of Laser-Ignited Direct Injection Gasoline Spray for Emission Control
نویسندگان
چکیده
Large-Eddy Simulations (LES) of a gasoline spray, where the mixture was ignited rapidly during or after injection, were performed in comparison to previous experimental study with quantitative flame motion and soot formation data [SAE 2020-01-0291] an accompanying Reynolds-Averaged Navier–Stokes (RANS) simulation at same conditions. The present reveals major shortcomings common RANS combustion modeling practices that are significantly improved using LES conditions study, specifically for phenomenon rapid ignition highly turbulent, stratified mixture. At different timings, benchmarks include spray mixing evaporation, propagation ignition, rich mixtures. A simulations experiments showed Dynamic Structure turbulence able capture correctly liquid penetration length, some extent, collapse demonstrated experiments. For early intermediate excellent agreement measurements terms structure, extent penetration, heat-release rate. However, (employing G-equation well-stirred reactor) much too spread heat release, connections predicted turbulent kinetic energy. With confidence motion, formation/oxidation also compared location well captured LES, but mass largely underestimated empirical Hiroyasu model. An analysis fuel–air used explain speeds production tendencies when varying timing.
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ژورنال
عنوان ژورنال: Energies
سال: 2021
ISSN: ['1996-1073']
DOI: https://doi.org/10.3390/en14217276