The effect of injection timing on the performance and emission of direct injection CI engine running on diethyl ether-diesel blends

Abstract

In diesel engine, fuel injection timing is a major parameter that affects combustion, performance and emission characteristics. Variation in injection timing has a strong effect on BTE, BSFC, BSEC, smoke and NOx emissions because of the change in maximum pressure and temperature in engine cylinder. In this experimental investigation, the optimum performance DEE-diesel blend ratio DE15D (15% DEE and 85% diesel by volume) was tested for variable injection timings to evaluate its effect and determine the optimum fuel injection timing, as the addition of DEE to diesel fuel causes retardation in dynamic injection timing. The engine tests were carried out at 10%, 25%, 50%, 75% and 100% of full load with 3º and 6º advancement, base and 3º and 7º retarded injection timings. The test results show that BSFC and BSEC provide the best result for the base injection timing at full load condition. The 6º advancement in injection timing at full load condition reduced smoke by 12.5% and HC by 15.38%. The retarded injection timing by 7º at full load showed improvement in BTE by 7.96% and in NOx by 3.66%.