正弦微沟槽织构对柱塞密封副摩擦学性能的影响

Objective: To study the influence of sinusoidal groove textures on the friction performance of the plunger sealing pair under different working conditions, so as to reduce the friction and wear of the plunger sealing pair of the fracturing pump. Methods: Based on the geometric model of the plunger sealing pair of the fracturing pump and the fluid lubrication theory, a numerical theoretical model of the hydrodynamic lubrication of the sinusoidal micro-groove textured plunger - rubber sealing pair was established. The influence of different plunger sealing pressures and movement speeds on the anti-wear performance of the sinusoidal texture was studied through simulation. Results: Under different sealing pressures, when increasing from 40 MPa to 140 MPa, both the oil film bearing capacity on the textured plunger surface and its growth rate continuously increase, the friction coefficient increases, and the growth rate decreases. Moreover, the higher the plunger movement speed, the greater the oil film bearing capacity and the friction coefficient. Under different plunger movement speeds, the oil film bearing capacity and the plunger speed have a linear growth relationship, the friction coefficient continuously increases, and the growth rate shows a decreasing trend. For the commonly used working conditions of the fracturing pump, the plunger movement speed and the sealing pressure are in a staggered peak combination. According to the simulation results, it can be seen that under the working condition of the plunger movement speed - sealing pressure of 150 strokes/min - 80 MPa, the oil film bearing capacity is the largest and the friction coefficient is the smallest, while under the working condition of 300 strokes/min - 40 MPa, the oil film bearing capacity is the smallest and the friction coefficient is the largest. Conclusion: The sinusoidal groove texture can effectively improve the hydrodynamic lubrication performance of the plunger sealing pair. Under the sinusoidal groove texture parameters in this paper, with the increase of the plunger sealing pressure and movement speed, both the oil film bearing capacity and the friction coefficient show an increasing trend.

目的研究不同工况下正弦沟槽织构对柱塞密封副摩擦性能的影响,以降低压裂泵柱塞密封副的摩擦磨损。方法基于压裂泵柱塞密封副几何模型和流体润滑理论,建立了正弦微沟槽织构化柱塞-橡胶密封副动压润滑数值理论模型,通过仿真模拟研究了不同柱塞密封压力、运动速度对正弦织构减磨性能的影响。结果不同密封压力下,从40 MPa增至140 MPa时,织构化柱塞表面的油膜承载力及其增长率都不断增大,摩擦系数增大,增长率减小,且柱塞运动速度越高,油膜承载力及摩擦系数越大。不同柱塞运动速度下,油膜承载力和柱塞速度成线性增长关系,摩擦系数不断增大,增长率则呈现减小趋势。针对常用的压裂泵工况,柱塞运动速度和密封压力为错峰配合。根据仿真结果可以看出,在柱塞运动速度-密封压力为150冲次/min-80 MPa工况下,油膜承载力最大,摩擦系数最小,而300冲次/min-40 MPa工况下的油膜承载力最小,摩擦系数系数最大。结论正弦沟槽织构能够有效改善柱塞密封副的动压润滑性能,在文中的正弦沟槽织构参数下,随着柱塞密封压力、运动速度的上升,油膜承载力和摩擦系数均呈现增长趋势。