Abstract
An experimental investigation was conducted to study the effect of variable engine parameters like injection timing and compression ratio on performance and emission characteristics of single cylinder four stroke Ricardo E6/US diesel engine at a constant speed (1800rpm) running on diesel fuel biodiesel blends with nano additive. By transesterification process, the biodiesel was produced from waste cooking oil. The mixture percentage consisted of diesel fuel (B5, B10, B15, and B20) vol%, iron oxide nanoparticle (Fe2O3), particle size of 20 nm and different weight fractions (10ppm, 30ppm, 50ppm, 70ppm, and 100ppm) wt%. The injection timing was regulated for (20°, 30°, 38°, and 40°) bTDC, while compression ratio was (16:1, 17:1, 18:1 and 20:1). The design of experiments (DOE) approach of Taguchi method was employed to predict the optimum parameter settings for engine performance like biodiesel blend (B20), nano additive (100ppm), injection timing (38° bTDC), and compression ratio (17). The experimental results showed that the addition of nano additive to biofuel gives increased brake thermal efficiency (BTE) by 15.05% and reduced brake specific fuel consumption (BSFC) by 10.73%. Furthermore, the exhaust emissions like CO, HC, and smoke density reduced by 62.5%, 63.01%, 28.9%, respectively, but NOx, PM increased by 16.19%, 15.30%, respectively, compared to diesel fuel.
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