Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
SPRAY AND COMBUSTION BEHAVIOR IN A LOCOMOTIVE ENGINE USING DIESEL/ETHANOL BLENDS: A CRFD ANALYSIS
Submission Author:
Daniel do V Rotter , SC , Brazil
Co-Authors:
Daniel do V Rotter, Gustavo Hackbarth, John Adilson Henschel Junior, Leonel R Cancino
Presenter: Daniel do V Rotter
doi://10.26678/ABCM.COBEM2021.COB2021-0706
Abstract
Rail transport, since its creation at the beginning of the 19th century, has been essential for the development of the modern world. Despite having many initiatives for electrification in this segment, this means of transport is, in most cases, powered by diesel internal combustion engines, having relatively low efficiency, which leads to high fuel consumption and emissions. Considering that the fuel costs for rail freight are remarkably high, any efficiency improvement in the engines is beneficial. The optimization of injection system parameters, such as the fuel spray angle, swirl, squish, and tumble interactions, as well as the use of fossil/biofuels blends, can be considered to improve the efficiency and emissions of the engine. This work reports a numerical analysis, based on computational reactive fluid dynamics, of a DASH9-BB40W locomotive engine. The main focus was to numerically evaluate the effects of injecting four different diesel-ethanol blends E0, E2, E5, and E10 (0, 2, 5, and 10% Vol.%). The cylinder, piston, and injector geometric parameters used for simulation were obtained from DASH9-BB40W engine technical data and then adapted to reproduce the main engine parameters (compression and spray angle, e.g.) in the AVL-FIRETM CAD geometry manager. The set-up models for the base case simulation with mixture E0 (100% fossil diesel) were then tuned in terms of combustion, turbulence, and spray parameters to obtain engine power and torque values close to the actual operational data of the DASH9-BB40W locomotive. Preliminary results show that the higher the ethanol percentage, the lower the engine power and torque, as expected, because of the reduction in the low heating value of fuel blend as increases the ethanol content, additionally, the spray behavior changes as ethanol content increases.
Keywords
Rail Diesel Engine, Diesel-Ethanol blends, Computational Reactive Fluid Dynamics, AVL-Fire
