Combined seal lubrication analysis under influence of surface roughness and cavitation effect
To study the influence of surface roughness and cavitation effect on the sealing performance of the plunger seal pair of fracturing pump,based on the steady Reynolds equation,the elastohydrody-namic lubrication numerical model of the combined seal under the influence of asperity and cavitation effect was established.On the basis of numerical simulation,the finite volume method was adopted to solve the steady-state Reynolds equation to study the distribution of film thickness,film pressure and film velocity under the influence of surface roughness,and the influence of different reciprocating ve-locity and slip-ring surface roughness on the sealing performance.The results show that the dynamic pressure effect in outstroke is weak,and the cavitation phenomenon occurs near the air side of the con-tact area.Higher reciprocating speed is beneficial to reduce the leakage and friction resistance.When the slip-ring surface roughness increases from 0.8 μm to 1.8 μm,the net leakage and friction of out-stroke increase by 180.4%and 11.17%,respectively.Therefore,it is proposed to apply higher recipro-cating speed and lower roughness slip-ring in the working process to improve the sealing performance.
fracturing pump plunger seal pairsurface roughnessmixed-lubrication modelsealing performance
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