20.500.12556/RUL-107600 Experimental and numerical investigation of injection timing and rail pressure impact on combustion characteristics of a diesel engine To explore the influence of fuel injection strategy on the combustion process, the Computational Fluid Dynamics (CFD) simulations were performed, and simulation results were validated against the experimental data measured at different rail pressures and injection timings. The experiments were conducted on a diesel engine equipped with an advanced injection system that allows full control over the injection parameters. To model the combustion process of EN590 diesel fuel, two different approaches were used: the General Gas Phase Reactions (GGPR) approach and the 3-zones Extended Coherent Flame Model (ECFM-3Z+). The calculated results, such as mean pressure and rate of heat release, were validated against experimental data in operating points with different injection parameters in order to prove the validity of spray and combustion sub-models. At the higher injected pressure, GGPR model showed better prediction capability in the premixed phase of combustion process, compared to the ECFM-3Z+ model. Nevertheless, in the rate-controlled phase of combustion process, ECFM-3Z+ model shows stronger diffusion of temperature field, due to the more detailed consideration of combustion diffusion phenomena in the ECFM-3Z+ governing equations. Furthermore, the results show that the rail pressure has a lower impact on the combustion process for injection timing after the Top Dead Centre (TDC). Both, single and multi-injection cases are found to be in a good agreement with the experimental data, while the GGPR approach was found to be suitable only for combustion delay determination and ECFM-3Z+ also for the entire combustion process. diesel engines combustion modelling fuel injection computational fluid dynamics general gas phase reactions coherent flame model sprays motorji s kompresijskim vžigom modeli zgorevanja vbrizg goriva računalniška dinamika tekočin true false true Angleški jezik Slovenski jezik Članek v reviji 2019-04-30 12:00:12 2019-04-30 12:00:16 2025-03-18 10:41:13 0000-00-00 00:00:00 2019 0 0 Str. 730-739 Vol. 185 Apr. 2019 0000-00-00 PostprintKoncna Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 2021-02-26 621.43(045) 0196-8904 10.1016/j.enconman.2019.02.039 16595739 2618919 RAZ_Juric_Filip_i2019.pdf RAZ_Juric_Filip_i2019.pdf 1 A47116D5F11AE599C80FF4DC44D36D94 9c800156ad5e2e89fa879bbe9258dd835d86fd7418b3581ef0d99b4e8a4d6e24 776c9a75-a1b6-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=118452 https://www.sciencedirect.com/science/article/pii/S0196890419302225?via%3Dihub 1 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=118451 Fakulteta za strojništvo 0 0 0