Study on Transport of Lubricating Oil and Fuel in Automobile Engine Using Gas-liquid-liquid Three-phase Flow Simulation Considering Moving Object

Abstract

We predicted the transport of fuel around the piston rings with the post injection by multiphase flow simulation based on computational fluid dynamics. We validated proposed numerical method based on dam break test with respect to the mixing of the different liquids. The computational region of our final goal is focused on the sliding surface of the top ring. From the visualization of the streamlines, it was observed that the air flowed from the ring grooves to the lower part of the piston. The mass flow rate at each part of the piston during the piston ascent suggested that part of the fuel and lubricant adhered to the piston due to the action of the top ring. In order to understand the behavior of fuel and lubricating oil in detail, it would be effective to use high grid resolution and set up an analysis region focusing on a thin oil film.