Optimization on Manifold Injection in DI Diesel Engine Fuelled with Acetylene

Abstract Researchers proved that implementing new combustion technology and optimizing fuel quantity results in a significant reduction in conventional fossil fuel usage as well as emission levels. One of the low temperature combustion technologies is the Reactivity Controlled Compression Ignition combustion strategy, which is used to lower the overall combustion temperature and provide better control over the combustion. This study focuses on Reactivity Controlled Compression Ignition combustion technology, which is fueled by conventional diesel fuel as a high reactivity fuel injected through the injector and acetylene gas as a low reactivity fuel injected through the modified inlet manifold along with air to the cylinder. The modified engine setup was carried out for performance, emission and combustion tests under different load conditions, as well as different mass flow rate of acetylene gas as a low reactivity fuel which is injected along with air. The flow field of the low reactivity fuel at the inlet manifold is analyzed using the Computational Fluid Dynamics principle, which is used to select the optimum flow rate to improve combustion quality. According to the simulation results, the optimized flow rate of acetylene is 3 Liters Per Minute, and according to the experimentation, at 3 Liters Per Minutes acetylene injection, the brake thermal efficiency is improved by about 3.7%, and emissions such as Carbon Monoxide, Hydro Carbon, smoke intensity, and Oxides of Nitrogen are reduced by about 35%, 17%, 10%, and 21%, respectively.