Increased power output and thermal load of pistons lead to the need for improved oil cooling to make pistons be able to sustain increased thermal load, a perfect method is to carry out an analysis and summarize a simulation of the coolant for a piston with an oil jet by AVL Boost and ANSYS.

Firstly, piston geometry would be simulated in ANSYS. This simulation uses dynamic mesh model and VOF model. And a computational mesh is also created for the fluid volume and the piston volume. In the simulation, different parts of the piston are illustrated clearly marked with different colors.

Then in a series of images of the under side of a piston crown shows the oil jet impingement on the piston underside and the cooling effect achieved for an entire engine cycle. From the six images the change of the temperature contours during different phases of a piston motion are illustrated. Thus it can be seen that the area where temperature is getting down gets larger and larger as the piston moves in fourstrokes starting with an up-stroke.

The practice shows this methodology is quite helpful for cooling enhancement.

Zhang Rui