Effect of Oxy-Hydrogen Addition in Gasoline on Engine Performance, Combustion Characteristics and Combustion Process at Different CR and IA

摘要

Due to higher calorific value and flame velocity, oxy-hydrogen gas blended hydrocarbon fuels are known to improve performance and combustion characteristics of engine at fixed compression ratio (CR) and ignition advance (IA). This paper present investigations on changes in engine performance and combustion characteristics at different CRs (6:1-9:1) and IAs (25-40 degrees before top dead centre (DBTDC)) when fuelled by gasoline, blended with oxy-hydrogen gas at three flow rates (B1-100, B2-150 and B3-200 ml per minute) and four speeds (1300, 1450, 1600 and 1750 RPM) compared to non-blended (NB) gasoline. 8.19% improvement in brake power (BP) is recorded for 9:1-1750-B1 configuration at 25DBTDC. 26.56% improvement in brake thermal efficiency (BTE) is recorded for 7:1-1750-B3 configuration at 35DBTDC. 20.83% drop in brake specific fuel consumption (BSFC) is recorded for 8:1-1750-B3 configuration at 35DBTDC again. 7.37% and 25.90% improvements in peak combustion pressure and net heat release rate are recorded for 7:1 and 9:1 CRs respectively with B2 at 35DBTDC. With B2, oxy-hydrogen gas blending influences ignition delay compared to 90% combustion completion time. Amongst performance parameters oxy-hydrogen addition affect BTE followed by BSFC. Amongst combustion parameters effect is significant on NHRR. Overall, 7:1-1750-B3 configuration at 35DBTDC produces maximum improvements.