عنوان مقاله [English]
نویسندگان [English]چکیده [English]
Increasing the injection pressure and using blend fuels are two strategies for reducing the emission of diesel engines. Accordingly, in the present study, by using the CFD analysis, the influence of high injection pressures on the non-reacting behavior of the liquid HFO and HFOn-butanol blend spray as an alternative fuel is studied. Three different injection pressures of 1000, 2000 and 3000 (bar) in a constant volume chamber of the medium speed diesel engine at the temperature of 298 K have been considered. Furthermore, an Eulerian-Lagrangian multiphase scheme has been used for simulating the interaction of the discrete liquid phase of the fuel with continuous air phase, while the Reitz-Diwakar scheme has been utilized for modeling the secondary breakup. Furthermore, numerical results of spray characteristics are validated with experimental data and a favorable agreement has been achieved. Based on obtained results, increasing the injection pressure would cause an increase in the spray penetration length and the spray cone angle and a decrease in the Sauter mean diameter (SMD). However, increasing the injection pressure from 1000 to 2000 (bar) has more significant effect on improving spray characteristics than an increase from 2000 to 3000 (bar).