Synergistic Performance and Emission Optimisation of a Two-Stroke SI Engine Using Mg-PSZ Thermal Barrier Coated Piston With Ethanol–Butanol Blends Through ANN–NSGA-II–TOPSIS Approach

Resumo

This paper reaches an assessment of the performance and emission traits of a two-stroke spark-ignition engine that is run with gasoline, E20, and B20 fuel under normal and Mg-PSZ-coated piston set ups. The characterization of fuels through GC and FTIR-generated stable mixtures and effective incorporation of the oxygenated functional groups. E20 in uncoated form enhanced brake thermal efficiency (BTE) by about 4-6 % than gasoline, and lowered HC and CO by 8-12 and 10-15 % respectively. Mg-PSZ coating increased the BTE by 5-8 percent and decreased the total fuel consumption by 3-6 percent at all loads. Coated conditions resulted in a further reduction of HC and CO emissions of 10-18%. ANN modeling resulted in R2 values in excess of 0.92 and NSGA-II-TOPSIS optimization established a coated high-load case with an overall 9-12% improvement in the performance-emission which shows high level of synergy between oxygenated fuels and thermal barrier coating.