Naslov
Numerical simulations of a diesel spray by using the Euler Eulerian multi-fluid approach

Autori
Pađen, Ivan ; Vujanović, Milan ; Petranović, Zvonimir ; Cerinski, Damijan

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Digital Proceedings of the 1st Latin American Conference on Sustainable Development of Energy, Water and Environment Systems / Ban, Marko [et al.] - Zagreb : SDEWES, 2018, 1-21

Skup
1st Latin American Conference on Sustainable Development of Energy, Water and Environment Systems (SDEWES)

Mjesto i datum
Rio de Janeiro, Brazil, 28.01.2018. - 31.01.2018

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
CFD ; Modelling ; Spray ; Primary atomization

Sažetak
In this research, atomization of liquid fuel is analysed using the computational fluid dynamics software AVL FIRE™. In internal combustion diesel engines, the high-velocity liquid fuel is injected into the combustion chamber through a small diameter nozzle. As a result, the turbulent and aerodynamic forces act upon the fuel jet surface, leading to the jet atomization. The atomization process is modelled by utilising the Euler Eulerian multi- fluid approach where both the liquid and the gaseous phases are considered as a continuum. Additionally, the liquid phase is separated into a finite number of droplet classes defined by the droplet diameter. Taking into account that the experimental investigation of the optically dense spray region is highly complex, the simulation results were compared to the available Direct Numerical Simulations (DNS) results. The axial and radial mixture volume fraction were compared, and the model coefficients have been chosen accordingly. The mesh dependency and sensitivity analyses were performed to evaluate the influence of mesh topology, time discretisation, model parameters, number of classes, and diameter of classes on the output data. Furthermore, the influence of the primary breakup process on the entire spray region was investigated by conducting non-reactive spray simulations. The spray characteristics, including the spray tip penetration, droplet frequency distributions, spray cone angle, and Sauter Mean Diameter (SMD) were analysed. Obtained results were compared to the available experimental data, and a good comparison was observed.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

POVEZANOST RADA