Application of Oxygenated DEE and Ethanol on the Performance and Emission Characteristics of Diesel-Fuelled CI Engine in the Context of Variable Injection Timing

Abstract

In a direct injection CI engine, the ignition delay and combustion characteristics are very sensitive to changes in fuel injection timing as the peak pressure and temperatures change significantly close to TDC. The addition of DEE and ethanol to diesel fuel causes retarding of the dynamic injection timing. Hence, it desires to study the effect of variable injection timing on emission and performance of DEE-ethanol-diesel blended CI engine and find out the optimum injection timing. In this experimental study, the optimum performance DE8E10D (8% DEE, 10% ethanol and 82% diesel by volume) blended fuel is selected for investigation. The engine tests are carried out at no load, 25%, 50%, 75% and 100% of full load with 3° and 6° advancement, base injection timing and 5° retarded injection timings. The test results reveal that BTE has improved and the smoke, CO and HC emissions have reduced with advanced injection timing. At full load condition, the 6° advancement in injection timing has reduced the smoke by 10.66% than the base injection timing. A sharp decrease in NOx emissions has been observed in 5° retard in injection timing. Overall, the results validate that 6° advancement is the optimum injection timing which has improved the overall performance and emissions of DEE-ethanol-diesel blend fuel in the CI engine.