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.
After diesel fuel injection, when the spray droplets in the air hit the wall, an oil film may be formed on the wall, and the surface roughness is the key parameter. To analyze the influence of roughness on the formation of oil film, a combustion model of the engine cylinder is built in this paper. The main part of the model is the simulation of diesel injection, and a related fuel injection model is built. The influence of cylinder wall roughness on the oil film formation in the diesel engine cylinder is analyzed through a wall-droplet interaction model.
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