Experimental Investigation of the Effect of Exhausts Gas Recirculation (EGR) On Nox-Smoke Trade-Off for SIE Fueled With Blends of Gasoline/Bioethanol

Abstract

Iraqi bio-ethanol can be used as an alternative fuel to gasoline to reduce the total CO2 emissions from internal combustion engines. This paper devoted to investigate the effect of usage of two blending ratios of 10 and 20% of bio-ethanol to gasoline with the addition of 10% hot and cool EGR. The experimental work was carried out on a multi-cylinders spark ignition engine at variable engine torque, speed, and spark timing conditions. The results show that adding bio-ethanol to gasoline reduced NOx and smoke opacity, and this influence alters with blends ratio complied with a certain pattern. EGR addition opposite smoke reduction consequence and limited it. Cool EGR resulted in lower NOx and higher emitted smoke. Retarding spark timing reduces NOx concentrations highly but increases smoke opacity. Advancing spark timing increases NOx but reduces smoke opacity.