Simulation of fuel injection through a nozzle having different position of the spray holes

In the article, a method of hydraulic calculation of working process of a diesel fuel feed system having a nozzle with different positions of its spray holes was investigated. A research of diesel engine injector nozzle design which had two groups of holes was carried out. Entering edges of the first group with the coefficient of flow μhl were located in the sack volume and entering edges of the second group (coefficient of flow μhu) – on the locking taper surface of the nozzle body. The coefficients of flow μhl and μhu differ considerably and depend on the valve needle position. This enables to distribute rationally the injection quantity by injection holes taking into account operating conditions of the diesel engine and hence – by the combustion chamber zones.