Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
EXPLORING THE LIMITS OF LEAN BURNING PERFORMANCE IN A SINGLE CYLINDER RESEARCH ENGINE
Submission Author:
Lucimar Amaral , MG , Brazil
Co-Authors:
Lucimar Amaral, Fabricio José Pacheco Pujatti, Álvaro César Martins Duarte, Rita Sebastiao, Ana Carolina Bueno Bontorin, Guilherme Machado, Rogério Carvalho
Presenter: Álvaro César Martins Duarte
doi://10.26678/ABCM.COBEM2019.COB2019-1713
Abstract
The demand for more efficient vehicles is growing worldwide. A promising technology is the Gasoline Direct Injection (GDI) engine combined with lean mixture (excess-air). An experimental investigation was performed to evaluate a GDI Single Cylinder Research Engine (SCRE) performance, fueled by a Brazilian premium gasoline in different air/fuel mixture conditions. Excess-air factor (λ) was set from 0.85 (rich mixtures) up to 1.50 (lean mixtures) in steps of 0.05, at engine full load and 4000 rpm. The engine spark timing was adjusted for Maximum Break Torque (MBT) condition or limited by knocking occurrence. Indicated Mean Effective Pressure, Indicated Specific Fuel Consumption, Mass Fraction Burned and Fuel Conversion Efficiency were obtained based on cylinder pressure and crankshaft position data. The combustion variability was analyzed from 200 recorded engine cycles for each operating condition. Results showed the use of lean mixtures can improve Indicated Specific Fuel Consumption, contributing to increase engine efficiency.
Keywords
premium gasoline, gasoline direct injection, single cylinder research engine, Lean burning
