Eventos Anais de eventos
ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
Characterization of the first combustion cycles operating on SI engine with PFI, lateral and central DI for gasoline-ethanol and gasoline fuel
Submission Author:
Maycon Silva , SP
Co-Authors:
Maycon Silva, Pedro Lacava
Presenter: Maycon Silva
doi://10.26678/ABCM.ENCIT2020.CIT20-0365
Abstract
Due to the difficulties in the first combustion cycles, providing ignition failures, and unstable combustion, a better understanding of the flame propagation behavior in this period was sought. With the aid of a research engine with optical access, the characteristics of the first cycles were investigated from the port fuel injection, lateral and central direct injection modes, being fed with gasoline and the gasoline-ethanol mixture. With the engine operated at a speed of 900 rpm for analysis of combustion behavior with low turbulent effects, optical and thermodynamic data were obtained. The results for port fuel injection suggest an increase in the flame area as the operation cycles increase, providing also a decrease in flame deformation. The absence of flame at the beginning of the process was observed, followed by unstable combustion. For the lateral direct injection mode, combustion achieved results close to the permanent thermal regime from the beginning, however, it presents great variability. The change of position to central direct injection showed improvements in the fuel distribution within the chamber, providing results with more speed and less variability. The increase in injection pressure also showed satisfactory results, thus proving to be an excellent technique to overcome evaporation difficulties.
Keywords
Combustion, First Cycles, SI Engines, gasoline and ethanol, Direct injection, port fuel injection
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