Numerical study of cavitation erosion in high-pressure fuel injector: The role of wobbling motion

Preprint, 2025

This study investigates cavitation erosion in high-pressure fuel injectors under static low lift and dynamic lift conditions. The static low lift simulation successfully identified erosion-prone regions, particularly near the needle tip and upstream of the orifice inlet, aligning well with experimental observations. Dynamic lift simulations were performed to analyze the effects of lift only and wobbling motions on cavitation dynamics and erosion patterns. When compared with the lift only simulation, it is revealed that wobbling
motion reduces the damage by redistributing pressure impacts from collapsing vapor structures. Thus, while wobbling motion cannot be intentionally controlled, its influence on cavitation-induced erosion provides valuable insights for injector design and offers a foundation for future exploration of wobbling motion in other cavitation-prone systems.