Diesel Injector Fuel Injector 0445120146 Bosch for Daewoo DV11 Euro 4 Doosan DV11 Euro 4 bh 120, Bx 212, Fx 116, Fx 117, Fx 120

Effect of Double Injector on Combustion Process in a 396 Series Diesel Engine (part 3)

Combustion model

The characteristic parameters of the 396 series diesel engine with flat-top convex basin combustion chamber are shown in Table 1. The geometric model is drawn by ProE software, the mesh division is completed by Hypermesh software, and then the mesh is optimized and encrypted by the AVL FIRE. The dynamic mesh is set for calculation and post-processing analysis. As the airflow movement in cylinder is asymmetrical and it has impact on the spatial distribution of the fuel spray and then on combustion process, the model is established for the whole combustion chamber. There are 56050 and 158900 mesh cells at TDC (top dead center) and BDC (bottom dead center) respectively, and the combustion chamber model at TDC is shown in Figure 1.9.

The main parameters of the 5-hole and 8-hole injectors and 4-hole dual-injector are shown in Table 2, and injectors with different injection holes have the same total effective flow cross section area. The distribution of spray particles in cylinder after fuel injection of 5°CA is shown in Figure 2. The eddy current ratio in cylinder is set to 2.9, the airflow movement in cylinder is asymmetric due to the position of the inlet valve, and the fuel spray is also impacted by airflow movement accordingly.10.

The chemical reaction dynamics calculation is carried out with the diesel standard component transport model of the FIRE, and the main calculation model selection is shown in Table 3. In the KHRT spray breakup model, the value of coefficient C2 is set to 12.

3. Simulation results and analysis Figure 3, Figure 4 and Figure 5 respectively show comparison and analysis of the pressure in cylinder, heat release rate, average temperature in cylinder, accumulated heat release and NO mass fraction when 5-hole and 8-hole injectors and 4-hole dual-injector are adopted.