Erosion Behavior and Influence Factors of Hydraulic Servo Spool Valve Working Edge
The working edge of the hydraulic servo spool valve is susceptible to erosion caused by particle pollutants in the oil,resulting in a degradation of the servo valve performance.This study investigates the erosion behavior and influencing factors of particles impacting the valve orifice's working edge using submersible jet erosion visualization experiments and solid-liquid two-phase flow numerical calculations.The results indicate that erosion behaviors can be categorized into four types:rubbing-sliding,bumping-sliding,suspension-overturning,and edge-collision.Edge-collision particles exhibit maximum velocities up to 40.41 m/s with high impact energy but minimal rebound speed of only 4.59 m/s,thereby causing significant erosion damage to the working edge.Moreover,at 1.2 MPa pressure level,both particle impact ratio and edge-collision ratio are higher compared to those at 0.9 MPa and 1.05 MPa levels with values of 46％and 7％,respectively.The impact ratio and edge-collision ratio increase with the increase of particle size.The impact ratio and edge-collision ratio of low viscosity oil are higher than those of high viscosity oil,and can reach 94％and 17％respectively when the viscosity is 0.01634 Pa·s.This study significantly contributes to understanding the mechanism behind erosion failure as well as anti-erosion design considerations for hydraulic servo spool valves.
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维普
