Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
ANALYSIS OF MERGED REACTION MECHANISMS IN AN INTERNAL COMBUSTION ENGINE USING C GASOLINE
Submission Author:
Bruno Silva de Lima , MG
Co-Authors:
Bruno Silva de Lima, Rafael Megale de Oliveira, Gabriel Mendes de Almeida Carvalho, Arthur Delfim, Bernardo Murta
Presenter: Arthur Delfim
doi://10.26678/ABCM.COBEM2017.COB17-1464
Abstract
Abstract. The main objective of this paper is to study a set of reaction mechanisms applied in engine simulations, focusing in making the simulation more reliable, since this is crucial to make the process practicable in the design of new engines. The experimental and numerical tests were obtained in an Otto engine using C gasoline, the initial and contour conditions from the tests were acquired in a dynamometer. The engine tested was 1.6 Flex, 4 cylinders and 16 valves. This engine works with PFI and has a compression ratio of 11:1 and the fuel used was E27 with lambda 1,0 and the engine speed used was 3500 rpm. The simulations cover mechanisms that apply for gasoline and anhydrous ethanol, which have to be combined to make the simulation run. A tool to combine them was employed in Converge-CFD and tested in a 3D engine simulation. The first mechanism used had 66 species and 215 reactions, the second 80 species and 422 reactions and the third 63 species and 380 reactions. The simulations were run in the Converge-CFD software with RANS turbulence model to model the turbulence .The results showed that two of the mechanisms had good convergence between them but one of them had a low pressure peak. Comparing with the experimental results the flame speed and consequently the pressure peak had low values, to overcome this problem the ignition advance was increased and then the results of the simulation were validated.
Keywords
Adaptive reaction mechanism, CFD, INTERNAL COMBUSTION ENGINES, Three dimensional simulation
