Abstract
The paper aims to analyze the flow field within the filter housing of a production fourcylinder, spark-ignition engine under steady-state conditions. To this purpose a numerical analysis was carried out adopting a finite volume CFD code. Specifically, the influence of the main filtering components on the performance of the intake system was evaluated.
The numerical results showed the great influence of the air filter on the flow distribution and on the volumetric efficiency. Furthermore, the analysis highlighted the improvements in the housing performances when the intake duct is added. This, in fact, produced a more uniform velocity distribution and pressure drop throughout the filter. Finally, a comparison between numerical data and Laser Doppler Anemometry (LDA) measurements was carried out, registering a good agreement.
Keywords: Internal Combustion Engine, air filter, CFD, LDA