Effect of Compression Ratio, Injection Pressure and Injection Timing on Performance and Smoke Emissions of CI engine Fuelled with Waste Fried Oil Methyl Esters - Diesel Blend

Abstract

Objective of this paper is to investigate the effect of Compression Ratio (CR) and injection parameters such as Injection Pressure (IP), Injection Timing (IT) on the performance and emissions of diesel engine. Biodiesel, produced through transesterification from waste fried oil, blended with diesel was used as fuel. Necessary modifications were carried out to achieve variation in input parameters such as Compression ratio, Injection pressure and injection timing. Tests were carried out using different CRs (16, 17, 18, and 19), ITs (24o, 27o and 30o BTDC) and IPs (200, 225 and 250 bar) at 3 kW engine load and 1500 rpm. The results showed that Brake Thermal Efficiency increased (BTE) and Brake Specific Fuel Consumption (BSFC) decreased with increase in CR from 16 to 18. While minor reduction in BTE with increase in BSFC was observed for further increase in CR from 18 to 19. Exhaust Gas Temperature (EGT) found decreased with reduction in smoke opacity (OP) with increase in CR. The best results for BSFC, and BTE were observed at CR of 18, IP of 250 bar and original IT of 27o BTDC. For tested fuel, an increase in IP, IT and CR leaded to increase in EGT and reduction in OP.