Modeling of gasoline compression ignition engine in partially premixed combustion mode

Yanzhao An, Qinglong Tang, Raman Vallinayagam, Hao Shi, Jaeheon Sim, Junseok Chang, Gaetano Magnotti, Hong G. Im, Bengt Johansson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This study aims to model partially premixed combustion (PPC) with flame index concept for low-octane gasoline in compression ignition (CI) engine. The validation experiment was carried out in a full-transparent AVL single optical CI engine. Fuel injection timing was fixed at -30 CAD aTDC to achieve PPC operation condition. Primary reference fuel, PRF77, with octane number of 77, was selected as test low-octane gasoline surrogate fuel. Multiple optical diagnostics were performed to validate numerical simulations, including high-speed color imaging and spray-tracer planar laser-induced fluorescence (PLIF) imaging. Full cycle engine simulations were performed using a CFD code CONVERGETM. The Takeno flame index was used to analyze the evolution of premixed and non-premixed flames. The simulation results show that the flame index could be used as a useful indicator for evaluating and quantifying combustion development under PPC operating condition. Premixed flames distribution is more consistent with the relatively low-temperature contour of 1500 K, most of the fuel/air mixture is burned out and less premixed flames exits at higher temperature contour of 2300 K.
Original languageEnglish (US)
Title of host publication12th Asia-Pacific Conference on Combustion, ASPACC 2019
PublisherCombustion Institute
StatePublished - Jan 1 2019

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