Effect of Different Droplet Impinging Models on Oil Film Formation of Diesel Engine’s Piston

Abstract

After diesel fuel injection, when spray droplets in the air hit the wall, four types of impingement states will be formed: stick, rebound, spread, and splash. There are already many models describing the impingement of droplets on the wall. In order to analyze the impact of the droplet-wall model on the formation of oil film, this paper constructed a three-dimensional model of the diesel combustion in engine’s cylinder. The main part of the model was the simulation of the diesel fuel injection process, and different droplet collision models were used to calculate their influence on oil film formation of engine’s piston.