نوع مقاله : مقاله پژوهشی
عنوان مقاله English
نویسندگان English
The use of common rail diesel engines is increasing in commercial, road construction, mining, and agricultural machinery due to their compliance with environmental standards. The fuel system in these engines operates at high rail pressures up to 2000 bar. At such pressures, a temperature rise in the fuel system and physical changes in the fuel are inevitable. In this applied research, three injector nozzles from Bosch, Denso, and Delphi—with different manufacturing technologies but similar operational principles—were tested using the Bosch measurement method on a CRT2000 injector test bench. The evaluation was performed using four types of domestic diesel fuel (Mahshahr 0.5%, Mahshahr 1%, Bandar Abbas 1%, and Lavan 500 ppm) with identical density (820 kg/m³), viscosity (3 cSt), and cetane number (49), alongside one foreign diesel fuel (D6) with a density of 870 kg/m³, viscosity of 5 cSt, and a cetane number of 49. The results indicated that in all three injectors, the mass of fuel injected into the combustion chamber increased with rising pressure. However, the amount of fuel injected for the foreign diesel (D6) was greater than that for the domestic types. Based on the performance data, it was concluded that this increase is due to the higher density and viscosity of the foreign diesel fuel. Another finding was that the fuel injection rate at a constant pressure increased with a longer pulse width applied to the injector.
کلیدواژهها English
