A comprehensive study on the effects of 1-decanol, compression ratio and exhaust gas recirculation on diesel engine characteristics powered with low density polyethylene oil

Abstract

This research work evaluates the influence of compression ratio and exhaust gas recirculation on combustion, performance, and emission characteristics of a compression ignition engine powered with diesel/WLDPE oil/1-decanol. A ternary blend was prepared using splash blending technique and the blend ratio was designated as 70% volume of diesel + 20% by volume of WLDPE oil + 10% by volume of 1-decanol called as D70L20DEC10 blend. The experimental trials were carried at three compression ratios (16:1, 17.5:1, and 19:1) and three EGR rates (0%, 10%, and 20%) at the maximum power output of the engine. Results indicated that ignition delay period get shortened as the compression ratio got higher. The in-cylinder pressure and the rate of heat release dropped with escalating EGR rates and increased with the higher compression ratio. In comparison with CR 17.5:1 and CR 16:1, BTE increased by 4% and 6%, respectively, for CR 19:1 operation. CR 19:1 under 0% EGR rate gave diesel equivalent BTE. The NOx emission escalated with increasing CR and reduced upon increasing the EGR rates. At CR 19:1, NOx emission was reduced by 58.82% as EGR grows from 0 to 20%. When compared to CR 17.5:1 and CR 16:1 smoke emission got suppressed by 31.6% and 36%, respectively, with CR 19:1 under 0% EGR operation. On the other hand, smoke emission aggravated with higher EGR rates at all CR . Both HC and CO emission decrease with higher CR and increased with the inclusion of EGR. Finally, CR 19:1 and 10% EGR rate are suggested as the best operating parameters when the engine is fueled with the ternary blend.