Performance of a CI Engine Operating in Highly Premixed Late Injection and Low Temperature Combustion Mode to Achieve Cleaner Emission – A CFD Analysis

Abstract

A comprehensive study on a single-cylinder four-stroke cycle Diesel engine that runs in HPLI and LTC modes to achieve a cleaner emission than existing normal diesel combustion has been carried out in this CFD analysis. The impact of HPLI and LTC mode on the engine's performance is also examined. Low Inlet Temperature and varying percentages of cooled EGR technology with Injection Timing Retardation were employed to accomplish HPLI and LTC mode. The program utilized for this investigation was ANSYS FORTE 19.2, which was developed by ANSYS. CHEMKIN, a very efficient and comprehensive pre-defined industry-standard chemical kinetics software, is included with this package. At 323K, 353K, 383K, and 413K, this analysis was carried out at various amounts of EGR ranging from 0% to 60%. The results reveal that as the EGR temperature rises, the heat release rate and ignition delay decrease. With an increase in EGR percentage from 0% to 60%, EINOx was lowered from 77.3 g/kg fuel to 1.99 g/kg fuel burned at 323K temperature. EINOx increased from 10.3 g/kgfuel to 14.7 g/kgfuel for 40% EGR with the increase in EGR Temperature. CO increased from 41.8 g/kgfuel to 385 g/kgfuel for 30% EGR with an increase in EGR Temperature. However, when considering UHC and CO emissions, it has been discovered that the percentage of EGR should not be increased further than 50% to reduce NOx emissions. That will also increase CO and UHC emissions. With a high proportion of EGR (40%) and a low temperature, the results were better.