Most recent discussion of the performance and emissions produced by a stratified Torch Ignition prototype engine fuelled by a blend of ethanol and gasoline.

Paper #:
  • 2017-01-0644

Published:
  • 2017-03-28
Abstract:
Vehicle emissions significantly increase the atmospheric air pollution and the green house gas (GHG) effect. This fact together with a fast global vehicle fleet growth requires a scientific technological solution, which introduces a significant reduction of vehicle fleet fuel consumption and emission to comply with future legislation. As a response to this requirement a prototype engine equipped with a torch ignition system and designed for stratified mixture conditions was made. The design is based on a commercial baseline engine layout. In this system, the combustion starts in a pre-chamber, where the pressure increase pushes the combustion jet flames through calibrated nozzles to be precisely targeted into the main combustion chamber. The combustion jet flames have high thermal and kinetic energy being able to promote a stable lean combustion process through enhanced mixture stratification. The fuel is supplied by direct fuel injection in the pre-chamber by means of a prototype gasoline/ethanol direct injector (GDI) developed to supply a low fuel flow rate. The paper presents the layut of the prototype engine and the developed fuel injection system. The paper continues with the most recent and detailed description of the performance of the torch ignition engine running on gasoline/ethanol blends for different mixture stratification levels as well as at different engine speeds and loads. Furthermore are made detailed analyses of the specific fuel consumption, the thermal and combustion efficiencies, the specific emission in particular of the CO2 and the main combustion parameters. The paper concludes presenting the most recent results obtained during this work, which show significant increase of the torch ignition engine performance in comparison with the commercial baseline engine. The results obtained in the present work show that the torch ignition system presents a promising and attractive path for the development of future internal combustion engine technologies. Authors M. Pontoppidan*, J. G. C. Baeta** * Numidis SARL, France ** Federal University of Minas Gerais (UFMG), Brazil
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