Abstract: In order to solve the problem of hydraulic damping hole blockage caused by solid particles, this study uses the Euler-Euler multiphase flow model of software Fluent to calculate and analyze the three-dimensional solid-liquid two-phase flow in the flow region of a slender-type hydraulic damping hole. Simulated results show that near the entrance of the damping hole, the solid particles are in a heap-like silting state, the solid-phase volume fraction appears “step” phenomenon along the flow direction of the central axis. It is also found that the solid-phase volume fraction decreases with the increase of the viscosity of the oil, and increases with the density of the particles. The siltation of particles in the central area of the damper inlet hole is the main cause of the blocking to the damping hole.

Key words: hydraulic damping hole, blockage, solid particles, deposition, numerical simulation