China made new fuel injector valve assembly F00VC01001 for fuel injector 0445110009

Simulation Study on the Impact of Uneven Fuel Injection of Each Hole of the Diesel Engine Injector on the Combustion Process (PART 6)

From the perspective of the accumulated heat release rate, the heat release in the early combustion stage at Uneven Condition is larger, but it is slightly reduced in the later period, so the combustion at Uneven Condition is not as sufficient as that at Even Condition.

Due to the uneven injection rate of each hole, some holes have high injection rate and large fuel injection quantity, and some holes have low injection rate and small fuel injection quantity. For the holes with high injection rate, as the fuel spray distance is longer and the space distribution within the same time is wider, fuel can be mixed with the air to form more mixtures in a relatively short period; however, due to the excessive fuel injection quantity, the fuel attached on the wall surface is increased, and the air-fuel ratio in the corresponding area is relatively low, so the diffusion combustion is incomplete [17]. For the holes with low injection rate, as the evaporation, atomization and mixing of fuel spray is slightly slower but the air in the area where the fuel spray is located is relatively sufficient, the combustion is complete and sufficient. Under the combined effect of these situations, the combustion starting point is moved ahead, the maximum cylinder pressure and temperature are increased, the NO generation is larger, the Soot generation is slightly larger, the combustion is incomplete and insufficient, and the HC and CO emission is slightly higher when compared with those at Even Condition.

 4 Conclusion

The spray impulse and injection pressure of each hole of the 4-hole injector of F186 engine are tested by using the transient test system for flow coefficient and injection rate of each hole of the injector.