Performance Optimization of Variable Compression Ratio Diesel engine fuelled with Waste Fried Oil Methyl Ester-diesel blends using Respose Surface Methodology

Abstract

This article investigates the effect of compression ratio & injection timing on the performance characteristics (brake thermal efficiency, brake specific fuel consumption) and emission characteristics (Exhaust gas temperature, Smoke opacity) of single-cylinder direct injection variable compression ratio diesel engine fuelled with various blends of waste fried oil methyl ester and mineral diesel. The statistical tool like response surface methodology is used to design experiment. A single cylinder 3.5 kW engine was selected for this experimentation. Optimization of compression ratio and injection timing was performed using desirability approach of RSM. The analysis of variance was performed to check the adequacy of the proposed model. A CR of 17.23, BX of 20%, and IT of 23.310BTDC were found to be optimal values for the Waste Fried Oil Methyl Esters (WFOME) blended with diesel fuel operation in the test engine of 3.5kW at 1500 rpm. The results of this study revealed that at optimal input parameters, the values of the BTE, BSFC, EGT and smoke opacity were found to be 27.12%, 0.313 kg/kW h, 278.930C and 66.86 HSU respectively.