Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
STUDY OF ADVANCE AND DELAY OF PILOT AND MAIN INJECTIONS FOR DIFFERENT ENGINE OPERATING LOADS
Submission Author:
Fábio Dias , SP
Co-Authors:
Fábio Dias, Pedro Lacava, Caio Rufino, Ezio Garcia, Raphael Marinho Lomonaco Neto
Presenter: Fábio Dias
doi://10.26678/ABCM.ENCIT2022.CIT22-0292
Abstract
This work presents an experimental study carried out on a test bench using a single cylinder compression ignition (CI) research engine that is coupled to an active alternating current dynamometer. The diesel engine is instrumented to enable the measurement of some parameters such as: pressure in the combustion chamber, temperature of the exhaust gases, temperature and pressure in the air intake and temperature of the coolant, among others. The engine was adapted to receive the Ducted Fuel Injection-DFI concept, which makes the injected fuel pass through a duct installed downstream of the injection nozzle, making the air/fuel mixture more efficient, making it more homogeneous, improving so combustion. Therefore, an analysis was made for three different operating loads varying their injection point in order to obtain the lowest soot formation value and the highest IMEP value. This study also aimed to analyze the formation of soot and emissions in general such as THC, CO, NOx and Soot for each case. Emissions were measured with Fourier Transform Infrared Spectroscopy – FTIR equipment, and soot was measured with Laser Induced Incandescence – LII equipment. For each load studied, an optimal point was found for the advance and for the delay in the "pilot" and "main" injections, the advance and delay for each injection was analyzed independently, in order to evaluate which injection and if advanced or delayed brings more benefits in emissions and thermodynamic. The variation in the injection point showed that for the DFI mode, the delay in the "main" injection is more beneficial in the cases presented, considering that the IMEP value increased, the soot formation decreased and the NOx formation also decreased, not presenting a trade -off between soot-NOx.
Keywords
Engine Diesel, DFI, Soot, emissions
