Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
Study of the influence of injection timing and direction in the performance of a spark ignition engine fueled with gasoline-ethanol
Submission Author:
Maycon Silva , SP
Co-Authors:
Maycon Silva, Pedro Lacava, Maria Esther Sbampato, Leila Ribeiro dos Santos, Alexander Penaranda
Presenter: Maycon Silva
doi://10.26678/ABCM.ENCIT2022.CIT22-0190
Abstract
One of the main energy sources in the transport sector in recent decades due to its high performance and reliability, internal combustion engines have been facing international obligations related to pollutant emissions and operations with renewable and more efficient fuels. Ethanol was one of the biofuels that received much attention due to its physicochemical properties and ability to be a partial or complete substitute for gasoline. One of the areas of analysis to obtain better thermodynamic and emission performance is fuel injection. Several configuration possibilities can be made, depending on the system configuration, which can provide great variability in thermodynamic behavior, in the optical behavior of the flame and in pollutant emissions. With this, it is essential to better understand the behavior and spatial propagation of the flame, for the development of more efficient engines, minimizing modifications in the engine design, less emissions and allowing to fully exploit the benefits of biofuels supply. The present work aims to study the effect of the injector position and its possible configurations, providing analysis of the best configuration that allows maximum efficiency and better operating conditions. To carry out the tests, an internal combustion engine AVL 5406 with spark ignition with optical access was used. A high-speed PCO.Dimax S1 camera coupled with a VS4-1845HS Scope dual intensifier and 105 f/4.5 UV-Nikon lens was used to obtain the optical data. For the engine and injector used, the configurations allowed analysis of the behavior of the spray with a jet of fuel directed towards the intake valve or the spark plug. In addition, the best angle for the start of injection was also analyzed, observing the influence of the residence time of the fuel inside the cylinder. For the spray directed to the intake valve, condensation of the fuel was observed, which provided inefficient combustion. As for the spray directed to the spark plug, the possibility of greater wear of the spark plug due to direct contact with the fuel and subsequent carbonization, especially at the beginning of the operation, stands out. Also noteworthy is the residence time inside the combustion chamber. The longer residence time for ethanol blends contributes to a better air-fuel mixture.
Keywords
gasoline-ethanol blend, Combustion, Injection timing, optical engine, Direct injection
