Evaluación del Comportamiento de Motores a Gasolina Mediante Simulación del Flujo de Aire a Través del Cuerpo de Aceleración

In this research, the throttle body of a small 1.1 L gasoline engine was analyzed. The electronic control module receives information from the pressure, temperature and throttle valve position sensors to perform calculations that determine the amount of fuel injection necessary to produce combustion. The objective of this work was to increase the air flow entering the intake manifold, using computational fluid dynamics (CFD). Two throttle valve models were analyzed, the original one, where the internal behavior of the throttle body was studied, both in pressures and flows. While, the second modified model, with a cut in the axis of rotation, where an increase in the air flow to the intake manifold is proposed. Four simulations were performed, with relative opening of 0, 20, 40 and78%, obtaining average pressure values between 31.35 and 70.05 kPa, as well as average flows at the intake manifold outlet of 6.72 to 58.71 g m -1 as the throttle valve opens. For data validation, the outlet pressures obtained with the intake manifold absolute pressure sensor were compared with the simulation values. Without having experimental data for mass flow, the analysis was performed between the two simulated models, with an average flow of 28.22 g m -1 and a 9% increase in mass flow in the modified body. As the throttle valve opening increases, the pressure values become similar.