Analysis and optimization of nozzle structure parameters of direct-drive giant magnetostrictive injector

Abstract

The related parameters of electronically controlled injector have profound influence on the fuel injection performance of injector. However, most of the current researches focus on some parameters of actuator, but few on some parameters of nozzle.Based on the direct-drive giant magnetostrictive injector, the simulation model of this injector was built with AMEsim simulation software, and the effects of nozzle parameters such as half cone angle of needle valve, diameter of needle valve stem and diameter of nozzle hole on the injection performance of this injector were studied. In view of the many research parameters, the orthogonal experiment method was adopted to design the experimental scheme reasonably, and finally L16(45) orthogonal experimental table was selected for the experiment. The results show that the parameters that have the greatest and smallest influence on the fuel injection performance of this injector are the cavity parameters and the number of injection holes. The optimum combination of nozzle parameters was obtained, and the fuel injection performance of injectors before and after the optimization of nozzle parameters was compared. It was found that the optimized combination of nozzle parameters had a better correspondence between fuel injection rate and needle valve displacement, which provided the possibility for further improving the flexibility of fuel injection rate.