In this paper, a reduced mechanism for diesel engines is developed, including 148 species and 647 reactions. The reduced mechanism includes NOX and soot sub-mechanism. Based on the reduced mechanism, a three-dimensional simulation of a diesel engine is carried out. Diesel is injected directly into the cylinder. By changing the strategy of diesel injection, the combustion in the engine cylinder under fixed conditions is simulated, and the pollution of combustion is analyzed. According to the simulation results, it is found that the injection strategy can change the temperature and pressure in the cylinder. Hence a better strategy will improve the combustion efficiency, reduce the generation of no and no2, and maybe reduce the mass fraction of soot et.al. The simulation results showed that different injection strategies have a great influence on the in-cylinder pressure, temperature, and pollution. The conclusion will be helpful in improving the fuel injection strategy and improving the performance of diesel engines.
This paper constructed a reduced combustion mechanism for diesel to build a three-dimensional model of the in-cylinder combustion of a diesel engine, analyzes the changes of in-cylinder pressure and temperature under different EGR rates, draws the three-dimensional spatial distribution of in-cylinder temperature.
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.
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