摘要
目的提高压裂泵柱塞表面的摩擦学性能。方法基于稳态二维不可压缩Reynolds方程,建立沟槽形表面织构化柱塞动压润滑理论模型,然后利用有限差分法和高斯-赛德尔迭代法求解柱塞表面的油膜压力分布和剪切应力,进而获得油膜承载力和摩擦系数,开展最小油膜厚度、织构的深度、横截面形状、面积占比以及分布角度对柱塞密封副油膜承载能力和摩擦系数影响规律的数值分析。结果随矩形沟槽织构深度从2μm增加到40μm,织构的动压润滑性能先增大后减小,当深度约为最小油膜厚度的0.6倍时达到最佳,并且最小油膜厚度越大,织构的动压效应越差。4种横截面沟槽织构的动压润滑性能优劣顺序为:矩形>内凸阶梯型>椭圆形>V型。随织构宽度从100μm增加到480μm,油膜承载力先增加后减小,宽度在360μm(72%面积占比)时达到最大。在6种分布角度中,60°矩形沟槽织构的润滑减磨性能最好。结论在流体动压润滑范围内,适当减小最小油膜厚度,沟槽底部尽可能平整,保持织构深度略小于最小油膜厚度,并使垂直速度方向油膜收敛区域的织构长度较长,便能获得润滑减摩性能较好的沟槽形表面织构。合理参数的沟槽形织构能够极大提高压裂泵柱塞表面的油膜承载力,降低摩擦系数,有利于延长柱塞密封副的使用寿命。
The work aims to improve the tribological properties on the surface of fracturing pump plunger.Based on the steady-state two-dimensional incompressible Reynolds equation,the theoretical model of grooved surface textured plunger dynamic pressure lubrication was established.Then,the finite difference method and Gauss-Seidel iteration method were used to solve the oil film pressure distribution and shear stress on the plunger surface.Furthermore,the oil film bearing capacity and friction coefficient were obtained,and the numerical analysis of the influence of the minimum oil film thickness,the depth,the cross-sectional shape,the area ratio and the distribution angle of the texture on the bearing capacity and friction coefficient of the plunger seal surface was carried out.As a result,with the texture depth of the rectangular groove increasing from 2 to 40μm,the dynamic lubrication performance of the texture first increased and then decreased.When the texture depth was about 0.6 times the minimum oil film thickness,the dynamic lubrication performance of the texture reached the maximum and the larger the minimum oil film thickness,the worse the dynamic pressure effect of the texture.The order of dynamic pressure lubrication performance of four cross-section groove textures was:rectangular>convex stepped type>ellipse>V type.With the texture width increasing from 100 to 480μm,the oil film bearing capacity increased first and then decreased.When the width was 360μm(72%area ratio),the oil film bearing capacity reached the optimum.In the groove texture of the six distribution angles,the 60°rectangular groove texture exhibited the best lubrication and wear reduction performance.In the hydrodynamic lubrication range,the minimum oil film thickness should be appropriately reduced,the bottom of the groove texture should be as flat as possible,the texture depth should be slightly smaller than the minimum oil film thickness,and the texture length of the oil film convergence region in the vertical direction should be longer,so that the groove-shaped surface texture with better lubrication and wear reduction performance can be obtained.The groove-like texture with reasonable parameters can greatly improve the bearing capacity of the oil film on the surface of the fracturing pump plunger and reduce the coefficient of friction,thus prolonging the service life of the plunger seal pair.
作者
王国荣
廖代胜
钟林
廖文玲
李梦媛
魏刚
WANG Guo-rong;LIAO Dai-shen;ZHONG Lin;LIAO Wen-ling;LI Meng-yuan;WEI Gang(School of Mechanical Engineering,Southwest Petroleum University,Chengdu 610500,China;School of Energy Equipment,Southwest Petroleum University,Chengdu 610500,China;School of Mechanical Engineering,Chengdu Technological University,Chengdu 610500,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2019年第12期165-173,共9页
Surface Technology
基金
国家自然科学基金(51775463)~~
关键词
压裂泵柱塞
表面织构
沟槽
动压润滑
织构参数
油膜承载力
摩擦系数
fracturing pump plunger
surface texture
groove
dynamic pressure lubrication
texture parameters
oil film bearing capacity
coefficient of friction
