Modelagem de preenchimento da galeria de refrigeração de pistão de motor de combustão interna usando o método SPH (Smoothed Particle Hydrodynamics).

Abstract

The piston maximum temperature is a very important characteristic for the development of an internal combustion engine. Several parameters define the piston maximum temperature that must be minimized, and the piston cooling efficiency is one of the relevant issues which is tightly related to the piston cooling gallery filling ratio (FR) that can be improved aiming to optimize the piston heat-transfer efficiency. The virtual modeling of the piston cooling gallery filling is traditionally performed by a transient CFD (Computational Fluid Dynamics) approach, however the availability of the SPH (Smoothed Particle Hydrodynamics) method can achieve good results with a simple approach of model preparation and short processing time leading to confidence project development with accurate of results and attractive cost efficiency. The focus of this work is to validate the SPH technics to predict the FR for a specific condition comparing the simulation results with bench test. Later this modeling approach is applied in a real piston engine application comparing two pistons with different cooling channel designs where is possible to observe the relation of modeled FR with the piston temperature measurements in the engine.