Abstract
A visualization experiment of flow pattern in a piston cooling channel was performed for the investigation of an oil behavior in the cooling channel. Two- and three-dimensional acrylic-resin channel substitutes simulating the piston cooling channel of the engine were prepared for the experiments, and distilled water was used instead of cooling oil. In addition, the flow pattern was observed by a high-speed camera and rapid motion of liquid phase in the channel was visualized. The results showed that the visualized flow pattern was obtained and they indicated that the energy of the cooling oil jet was lost at the inlet branching point because of collision against the wall inside the channel. This caused the decrease of the total flow rate of the cooling oil.
