Effect of compression ratio on compression ignition engine with RUCO biodiesel/ diethyl ether/ diesel fuel blends

Abstract

ABSTRACT The aim of the present investigation is to examine the characteristics of diesel engine for varying concentrations of diethyl ether (DEE) as an oxygenated additive in repurpose used cooking oil (RUCO) biodiesel and diesel blends. In the beginning, several pilot experimentations are carried out on diesel and B20 blend. Afterward, 0.8%, 1.6%, 2.4%, 3.2%, and 4% of DEE was blended with biodiesel/diesel. The IS standards are followed for investigating the various properties of biodiesel blends. Property investigation results revealed that the increasing concentration of DEE reduces the density, viscosity, calorific value, flash point with increase in cetane number. All the prepared blends are examined on water-cooled diesel engine at six distinct loads and constant engine speed. The investigation revealed that the BTE (brake thermal efficiency) increased by 16.06% while BSFC (brake specific fuel consumption) decreased by 4.12% for 0.8% concentration of DEE in a blend when contrasted with diesel. All tested fuel shows nearly the same trend of BSEC at all loading conditions and compression ratios. Further, the CI engine fueled with biodiesel-DEE-diesel blends has shown 20.41%, 34.69%, and 23.33% a maximum reduction in CO, HC, and NOx emissions as compared to diesel fuel at notable working conditions. The CO2 emission reduced in ternary blends due to lower carbon content in the blend. It can be noted that the minimum 0.8% concentration of DEE at CR15 in the ternary blend provided significant increment in BTE as 16.06%, with a 4.12% reduction in BSFC while CO, HC and NOx emissions minimized by 15.07%, 3.45%, and 14.70% than that of diesel fuel. In minimum concentration of DEE, the A0.8B19.2 blend provided luminous results in both performance and emission characteristics at CR15.