Experimental and numerical investigation of injection timing and rail pressure impact on combustion characteristics of a diesel engine

Jurić, Filip (author), Petranović, Zvonimir (author), Vujanović, Milan (author), Katrašnik, Tomaž (author), Vihar, Rok (author), Wang, Xuebin (author), Duić, Neven (author)

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.

• Language: English
• Keywords: diesel engines, combustion modelling, fuel injection, computational fluid dynamics, general gas phase reactions, coherent flame model, sprays
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Author Accepted Manuscript
• Year: 2019
• Number of pages: Str. 730-739
• Numbering: Vol. 185
• PID: 20.500.12556/RUL-107600
• UDC: 621.43(045)
• ISSN on article: 0196-8904
• DOI: 10.1016/j.enconman.2019.02.039
• COBISS.SI-ID: 16595739
• Publication date in RUL: 30.04.2019

Record is a part of a journal

• Title: Energy conversion and management
• Shortened title: Energy convers. manage.
• Publisher: Elsevier
• ISSN: 0196-8904
• COBISS.SI-ID: 2618919

Secondary language

• Language: Slovenian
• Keywords: motorji s kompresijskim vžigom, modeli zgorevanja, vbrizg goriva, računalniška dinamika tekočin

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0401
• Name: Energetsko strojništvo