Common Rail Fuel Injector 0445120067 Compatible for Renault Truck Volvo Excavator Ec210 Ec210b

Simulation Study on the Impact of Uneven Fuel Injection of Each Hole of the Diesel Engine Injector on the Combustion Process (PART 4)

 Minimization of some fuel sprays are faster around the fuel spray with high injection rate in the early period, the ignition occurs at 348°CA [11]. However, under the uniform injection rate, a significant high temperature area occurs at 350°CA, and the fuel ignition occurs in cylinder. It can be found out that, under the uneven fuel injection rate, some holes with high injection rate shorten the ignition delay period and make the combustion starting point earlier. After the start of combustion, it is in the stage of piston upward approaching the top dead center [12]. The temperature and pressure in cylinder rise rapidly, the turbulence of air flow is strengthened, the fuel vaporization, atomization and mixing, and the ignition condition are accelerated, so the combustion is faster[13].

 The high temperature and pressure in cylinder accelerate atomization of the fuel particles. Figure 4 shows that, most of fuel particles sprayed in the early period at Uneven Condition have been vaporized and atomized at 355°CA; therefore, a large number of fuel can be used for the combustion, and the temperature and pressure in cylinder are significantly higher than those at Even Condition. The fuel particles are significantly reduced, the concentration of fuel components close to the wall surface in combustion chamber is relatively higher, the high temperature area in cylinder is widened, the temperature distribution in cylinder is widened, and the NO generation is increased due to higher and wider in-cylinder temperature distribution when compared with those at 360°CA at Even Condition [14]. At 380°CA, the high temperature area at Even Condition and Uneven Condition is almost the same, compared with the more fuel components for the early combustion at Uneven Condition, more fuel components are used for the combustion at Even Condition, the fuel component in areas outside of the hole is relatively even, the air volume is relatively abundant, so the combustion is sufficient.