Diesel Injector Fuel Injector 0445120148 Bosch for Man TGL TGM D0834lfl50 D0836lfl53

Effect of Double Injector on Combustion Process in a 396 Series Diesel Engine (part 4)

Figure 3 and Figure 4 show that, when compared with the case of adopting 5-hole injector, the case of adopting 8-hole injector has lower combustion heat release rate, pressure in cylinder, average temperature in cylinder, accumulated heat release and thermal efficiency, and combustion process becomes incomplete. In addition, when compared with the case of adopting 8-hole injector, the case of adopting 4-hole dual-injector has better combustion process, and the pressure in cylinder and combustion heat release rate are between those of the case of adopting 5-hole and 8-hole injectors.

However, when compared with the case of adopting 5-hole injector, the case of adopting 4-hole dual injector has lower maximum average temperature in cylinder, slightly higher average temperature in cylinder during the latter combustion period and basically the same accumulated heat release. Under the condition that the injection duration and the effective flow area are unchanged, when the holes are increased and the diameter is reduced, the size of fuel spray particles is smaller, the atomization quality is improved, but the penetrating distance of oil beam is decreased.

The distribution of fuel in space is synthetically determined by the number of nozzles and the fuel penetration distance.11, 12 the improvement of atomization quality is conductive to the formation of more pre-mixed gas during the ignition delay period and the acceleration of the diffusion combustion.

However, as the penetrating distance is reduced, the fuel is concentrated near the nozzle and fails to mix with the fresh air at the far end. This results in reduced pre-mixed gas volume during the ignition delay period and extended combustion duration.