Simulation Analysis of the Impact on Gasoline Engine Power Performance by Optimizing the Structure of Intake Ports

Abstract

The performance of internal combustion (IC) engine is influenced by the characteristic of the intake process. The intake process of is very complex because the pressure waves transmission and reflection lead to pulsation and resonance in the pipes. The intake quality is directly related to the structure size of intake ports. The objective of this study is to use a one-dimensional simulation methodology to optimize the intake ports structure of a four-cylinder gasoline engine equipped with turbocharger and intercooler. Steady-state simulation was performed and the results were verified by the experiment data. The impact of the structure size of intake ports on power performance was identified and analyzed. The length of intake ports influences the pressure wave in the intake ports, and then the volumetric efficiency was impacted. The length of the intake port is inversely proportional to the resonance frequency, which means the longer the pipe is, the smaller the resonance frequency is, and then the lower engine velocity the resonance point moves to. This analytical methodology has significant advantages and can be applied to optimize the structure and the performance of the engine.