Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
NUMERICAL METHODOLOGY FOR ANALYSIS AND CHARACTERIZATION OF THE FUEL SPRAY IN A COMBUSTION ENGINE
Submission Author:
Helder Alves de Almeida Junior , MG
Co-Authors:
Helder Alves de Almeida Junior, Ramon Molina Valle, Claudio Santana
Presenter: Helder Alves de Almeida Junior
doi://10.26678/ABCM.COBEM2019.COB2019-1118
Abstract
The computational simulation for the spray characterization of an internal spark ignition internal combustion engine presents a great challenge to new technologies and systems that seek better fuel utilization and a lower level of emissions. New technologies such as direct injection of fuel into spark ignition engines have emerged in the face of strong environmental appeal and the limitation of fossil fuel sources, which require increasingly efficient and less polluting vehicles. With the increasing insertion of this technology in the automotive market, the characterization of fuel spraying by the injector is important to increase combustion efficiency and avoid abnormal or incomplete combustion. For the numerical analysis of the spray there are several commercial CFD software, Computational Fluid Dynamics, which can be applied in this study, but there is an increasing and substantial need for less expensive software. Within this context, this work has as main objective to propose a methodology for numerical characterization of the spray in an internal combustion engine of direct injection. Taking into account academic and industrial interests in the manipulation of open CFD codes the OpenFOAM software for the characterization of the spray was used in this work. Spray dispersion models such as LISA, TAB, Reitz-Diwakar and KHRT were used and modified to converge with the experimental data obtained in dynamometer tests. Important parameters of the spray, such as break-up length, cone angle, penetration, droplet diameter, droplet dispersion, velocity fields, among others, were calculated and analyzed in this work. The main results showed that the spray dispersion models are well implemented in the software compared to the literature. The work also demonstrates that the Rosin Rammler model reproduces better the distribution of Spray drops by comparing the results of the simulation with the experimental results.
Keywords
CFD, Fuel-Spray, OpenFOAM
