Injector Dynamics Assumptions and Their Impact on Predicting Cavitation and Performance

From 2012 Automotive Simulation World Congress: For a transient fluid−structure interaction simulation of a current injector design, the geometry includes the injector’s nozzle and plunger, with the plunger being moved based on fluid forces in the axial direction. The simulation studies a full injection event, including filling of the sac via the volume of fluid (VoF) model, which allows for liquid fuel−air and liquid fuel−fuel vapor interactions. The overarching goal is to improve start-of injection (SOI) predictions and injector performance, investigate flow field inside the spray holes (studying cavitation and potential hysteresis effects), and gain a fundamental understanding of the injector process’ impact on emissions.

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