Cavitating Injector Flow Simulations Considering Longitudinal and Lateral Needle Displacement

Abstract

Present paper outlines the simulation technique for dynamic analysis of cavitating Diesel injector flow, considering longitudinal and lateral needle displacements. The current research is performed with the goal to eventually enable direct coupling of 1D hydraulic tools, providing exact needle positions in three coordinates, with 3D CFD tool AVL FIRER. At this stage the needle displacements in longitudinal and lateral directions have been predefined. In reality the needle will be pushed aside by the flow for different reasons; different radii at the hole inlet and non-equi-angular hole positioning. Predicted flow shows visible non-uniformity resulting from non-symmetric nature of the injector domain.