Auto Parts Fuel Injector Diesel Injection 0445120218 0 445 120 218 for Auto Fuel Common Rail Nozzle Injector

Simulation Study on the Impact of Uneven Fuel Injection of Each Hole of the Diesel Engine Injector on the Combustion Process (PART 7)

According to the measured whole injection rate and cycle fuel injection quantity, the uniform injection rate and measured uneven injection rate of each hole are made as the injection setting for the combustion simulation and the analysis of the impact of uneven injection rate of each hole on the diesel engine combustion process. Based on the model-based engine parameter characteristics and the uneven injection rate of the tested diesel injector, the following conclusions can be drawn. (1) As the injection rate of each hole is uneven, some holes with high injection rate have long fuel spray penetration distance, and the fuel spray is fully mixed with the air, so the ignition starting point is moved ahead. (2) The phase corresponding to the heat release rate at Uneven Condition is moved forwards when compared with that at Even Condition. The early combustion period is in the late compression stroke period, which makes the maximum cylinder pressure and temperature rise fast, the maximum cylinder pressure and the maximum average temperature in cylinder higher than those at Even Condition, the NO generation larger, and the Soot generation slightly larger. (3) The utilization of air in the hole-located cylinder by the fuel spray at Uneven Condition is uneven, a large injection quantity of the holes makes the oxygen of the fuel spray space relatively low, and the wall collisions of the hole with high injection rate are more, so the combustion is incomplete and insufficient.

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