Experimental investigation on the characteristics of diesel oxygenated fuel blends in a di diesel engine using two spring split injection

Abstract

Diesel engines are efficient prime movers for heavy duty vehicles, so they have attracted many automobile and research institutions for their use as main prime movers of vehicles. Considerable research has been carried out on the applicability of such engines to light duty vehicles and small engines. In pilot injection, a small amount of fuel injected during the ignition delay period is a means of reducing diesel knock and the pilot injection is used to shorten the ignition delay and to control the rapid pressure rise. In this present work, experimental investigation was carried out using eddy current dynamometer to investigate the performance, emission and combustion characteristics of diesel and diesel- oxygenated compounds blends such as DEC, EAA and DEG in the proportions of 5%, 7% and 10%. by volume in a direct injection single cylinder diesel engine using standard single injection and two spring split injection. The final conclusions obtained from the experimental analysis are: 1. Among the three oxygenates the 10%DEC oxygenated blends show optimum performance for both the standard single and two spring split injection 2. Considering the emission parameters 10%DEC oxygenated blends with injection timing of 270 bTDC is found to be the best for two spring split injection method compared to single injection method. 3. The split injection concept using two spring injector is useful for the reduction of NOx emission and also better than the other two oxygenates with respect to the performance characteristics such as brake thermal efficiency, and SFC. By split injection concept the combustion characteristics such as cylinder pressure, rate of pressure rise, heat release rate and cumulative heat release show optimum results. 4. It is concluded that10%DEC-diesel oxygenated blend is found to be better with 29.3% of Brake thermal efficiency, 1.32 g/kW.hr of NOx emission and 36%opacity of smoke level with two spring split injection at an Injection timings of270 bTDC. newline newline newline