Abstract
In diesel engines, the fuel spray breakup and atomization process have tremendous dependence on the nozzle internal geometries, then the performance, fuel consumption and emission of the engines will be affected. Based on the synchrotron X-ray micro-tomography, the three-dimensional models of the diesel nozzles were established. Then the internal geometries of the nozzle orifices, such as the diameter, the length and the inlet chamfer radius of the orifice, can be measured, making it possible to analyze the impact of different nozzle orifice processing methods. Meanwhile, the nozzle digital models were successfully applied to simulate the internal flow of high pressure fuel inside the nozzle; the effects of nozzle geometries on internal flow characteristics have been analyzed. The results show that these works are significant to the promoting of diesel nozzle processing technologies, and the revealing of high pressure fuel spray breakup mechanism.
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