Abstract
The present study intends to explore the in-cylinder combustion and evolution of soot emission during the transition from conventional compression ignition (CI) combustion to partially premixed combustion (PPC) under low load conditions. In-cylinder combustion images and engine-out emissions were measured in an optical engine fueled with low octane heavy naphtha fuel (RON = 50). Full cycle engine simulations were performed using a three-dimensional computational fluid dynamics code CONVERGE, coupled with gas-phase chemical kinetics, turbulence, and a particulate size mimic soot model. The simulations were performed under low load conditions (indicated mean effective pressure (IMEP) of ∼2–3 bar) at an engine speed of 1200 rpm. The start of injection (SOI) was advanced from late (−10 CAD aTDC) to early fuel injection timings (−40 CAD aTDC) to realize the combustion transition from CI combustion to PPC. The simulation results of combustion and emission are compared with the experimental results in both CI an...
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