Análise experimental dos parâmetros de combustão em um motor turboalimentado

Abstract

Currently within the context of internal combustion engines, there are several challenges to increase engine efficiency through new technologies and concepts in the automotive industry, such as downsizing and turbocharging. For this reason, understanding the phenomena and the fundamental parameters that influence the combustion behavior is important to conduct engine calibration procedures and increase the energy efficiency of internal combustion engines. This undergraduate thesis analyses the performance of a spark ignition engine through the combustion process and the heat release rate. Hereby, the influence of: charge, turbulence intensity, ignition advance and air/fuel rate on the combustion parameters is analyzed indirectly. The experimental procedure was conducted with a 1.8L 4-cylinder engine equipped with a turbocharger with 8:85 compression ratio and fuel injection system in the intake duct. Finally, results are presented to describe the heat release rate and combustion stability. Performance improvements and stable operating regimes with COV�� less than 3% were achieved for the evaluated points.