Impact of diesel-biodiesel-hexanol tri-fuel blends on the combustion and exhaust emissions characteristics of a diesel engine

摘要

The purpose of this study is to investigate the impact of diesel-biodiesel-hexanol tri-fuel blends on combustion and exhaust emissions characteristics of a diesel engine.The presence of a hexanol(C6H_(13)OH)in tri-fuel blends helps to increase the oxygen content in combustion phase.The experimental tests were performed with YANMAR TF120M single-cylinder,direct-injection diesel engine.The results of tri-fuel blends were investigated and compared with diesel fuel(DP)and neat biodiesel(B100).The engine was run at varying engine loads 0%,25%,50%,75%,and 100% at constant engine speed 1800 rpm.DP and palm oil methyl-ester(POME)were dispersed in 5%,10%,and 15% hexanol,which were formed as tri-fuel blends.The blending process of tri-fuel blends used ultrasonic emulsifier with cycle 0.5 and an amplitude of 70%,within 2 minutes.Compared to DP,the results reveal the in-cylinder pressure of BlOO,HE5,HE 10,and HE15,were reduced by 2.23%,1.95%,2.19%,and 2.00%,respectively at 50% engine load.Furthermore,the heat release rate at 50% engine load for HE15 was increased by 6.42%,gives the highest combustion efficiency.CO,CO2 and NOx emissions were decreased by 7.06%,12.20%,and 22.85% for HE15 at 75% engine load.This study concluded that HE15 fuel blend shows positive impacts in combustion and emissions characteristics of a diesel engine.