Study on Valve Core Oscillation Induced Cavitation Based on Immersion Boundary and Adaptive Mesh Refinement

Poppet valve is one of the most important and core control components in hydraulic systems. As a pressure regulating valve, the valve core is prone to axial oscillation, leading to cavitation in the flow field. To study the mechanism of cavitation induced by valve core oscillation, a targeted twophase cavitation flow solver was developed based on the immersion boundary and adaptive mesh refinement technology in OpenFOAM. Combining visualization experiments, the solver was used to numerically simulate the oscillation of the valve core. The results showed that during the valve core closing stage, when the valve opening was 0.1mm, the vortex formed by the jet triggered the onset of wandering cavitation. When the valve opening was 0.02mm, the low pressure caused the wandering cavitation gas core to expand violently, resulting in secondary cavitation downstream of the valve cavity; The cavitation generated during the opening stage of the valve core is caused by the pressure difference driving the oil to flow through the valve port at high speed, forming jet cavitation. When the valve port opening is greater than 0.6mm, the cavitation collapses. Therefore, in practical use, the minimum opening of the poppet valve should be maintained at least 0.6mm to suppress cavitation induced by valve core oscillation.