Simulation and Experimental Research on Pollutes Control in Direct Injection Diesel Engine

To simulate the combustion species for direct-injection diesel engines, the new flame let model is presented and used. The model is based on stoichiometric mixture fraction space, and a way of separating the numerical effort associated with the solution of the turbulent flow field from that of solving the chemistry is offered. The new species equations are carried out through coordinates´ transformation. The results from the species equation are developed and three-dimension entity model with the mixture fraction is got. Then the boundary conditions are put into the new flame let model. Furthermore the pollutions emissions are calculated and compared with the experimental data. The displacement is 300cc, combustion chamber is omega-shape bowl, bore is 70.0 mm, stroke is 78.0mm, connecting rod is 132.6mm, and compression ratio is 19.5.