Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
ANALYSIS OF THE CONCEPT OF FUEL INJECTION IN DUCTS - DFI WITH DIFFERENT STAND-OFF DISTANCES IN A DIESEL CYCLE RESEARCH ENGINE.
Submission Author:
Fábio Dias , SP
Co-Authors:
Fábio Dias, Pedro Lacava, Ezio Garcia
Presenter: Fábio Dias
doi://10.26678/ABCM.COBEM2021.COB2021-0500
Abstract
The present work aimed to investigate the application of the concept of fuel injection in ducts (Ducted Fuel Injection - DFI) with different Stand-off distances. The DFI concept consists of making the fuel spray pass through a small cylindrical duct immediately after leaving the nozzle injector injection orifice, thus improving the pre-mixing phase between air / fuel in the fuel auto-ignition zone in compared to the conventional model which is called free spray, where it is directly launched into the combustion chamber. This concept shows a significant potential for reducing soot in diesel engines, which is very interesting to meet current emission standards, and also to reduce costs with after-treatment systems. The spacing distance has a great effect on the results that will be obtained with the installation of the ducts, because if the ducts are too far from the injector nozzle, ignition can occur upstream of the duct, which would cause an increase in soot in the combustion. However, the duct cannot be installed too close to the nozzle, as this would make the mixture very rich due to the deficiency of air inside the duct, as there would be no space for air to enter the duct to have a good air/fuel mixture increasing soot levels as well.
Keywords
Engine, Cycle Diesel, DFI, Stand-off Distance, Soot.
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