Diesel Injector Fuel Injector 0445120185 Bosch for Dodge RAM 4500 / 5500 6.7L Cummins Turbo Diesel I6 Engine

Developing the Model of Fuel Injection Process Efficiency Analysis for Injector for Diesel Engines （part 4）

A particular feature in determining the mean pressure upstream the nozzles is the necessity to consider the features of different injection modes, in which the needle can not only oscillate, but also set in the seat, and therefore the time of non-zero flow through the atomizer orifices may not coincide with the cycle time. Therefore, the mean pressure is proposed to be calculated by dividing the integral from the pressure upstream of the orifices of the atomizer in time by the time integral corresponding to a non-zero flow through the orifices of the atomizer (1).

The package LMS Imagine.Lab AMESim is capable of representingn the model results in the form of the curve of caluclated values versus time. Therefore, it is possible to select several parameters to be used for comparison of the systems’ options and building regression models based on the analysis of the mean pressure variation upstream the orifices as full injection cycle characteristics, for example:

- a finite or a maximum mean pressure value upstream the nozzles;

- the time for reaching the maximum mean pressure value upstream the nozzles

Building these curves depending on the parameters varying through the modelling process extends the result analysis possibilities to the design stage. The tool model in the LMS Imagine.Lab AMESim software package is represented in fig. 2.General view of the injector with the above blocks is given in fig. 3

2.2 Determining Sauter mean drop diameter and jet range

The fuel atomizing quality is directly related to the geometry of the fuel spray, the nature of the jet disintegration and the diameter of the drops.