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| Combined seal lubrication analysis under the influence of surface roughness and cavitation effect |
| ZHANG Yi1*,XIONG Zijie1,LI Dajian2,XIONG Siyang1,ZHONG Sipeng1 |
| 1. School of Mechanical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China; 2. Oil and Gas Technology Research Institute of Changqing Oilfield Branch of CNPC, Xi'an, Shaanxi 710018, China |
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Abstract The surface roughness and cavitation effect have a great influence on the sealing performance of the piston seal pair of fracturing pump. Based on the steady Reynolds equation, the elastohydrodynamic lubrication numerical model of the combined seal under the influence of asperity and cavitation effect is established. On the basis of numerical simulation, the finite volume method is 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 velocity 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 contact 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 outstroke increase by 180.4% and 11.17%, respectively. Therefore, higher reciprocating speed and lower roughness slip ring should be set in the working process to improve the sealing performance.
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Received: 19 September 2022
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