Solid-liquid Flow Characteristics and Sticking Mechanism in Clearance of Valve Core
External contamination particles or wear particles corroded by valve trims are mixed into the fluid,and as the fluid enters the fitting clearance of the valve core,the resistance of the valve core increases,and the valve core is prone to sticking.This paper takes a typical hydraulic spool valve as an example to analyze the solid-liquid flow characteristics in the fitting clearance and the sticking of the valve core based on Euler-Eulerian model.The oil flow characteristics with polluted particles in a cross-scale watershed are analyzed.There are dramatic changes in pressure and velocity in cross-scale fluid domain.With the increase of particle diameter,the volume fraction of particles in the clearance gradually increases,and there is agglomeration.The influence of particle characteristic parameters(particle concentration and particle diameter)on the particle distribution in the clearance and the sticking force of valve core was analyzed.The volume fraction of particles in the pressure equalizing tank is the highest,and the peak value also increases with the increase of particle diameter.With the increase of particle diameter,the sticking force first increases and then decreases.When the particle diameter is 12 μm,the sticking force is the largest,which is the sensitive particle diameter.
valve core stickingflow characteristicspolluted particlessticking force
万方数据
维普
