基于CFD织构表面柱塞适用工况的数值模拟  

Numerical simulation for suitable working conditions of surface-textured plunger based on CFD

作　　者：胡嵩 张心明[2] 郑龙 任露泉 HU Song;ZHANG Xinming;ZHENG Long;REN Luquan(Key Laboratory of Bionic Engineering,Ministry of Education,Jilin University,Changchun,Jilin 130022,China;College of Mechanical and Electrical Engineering,Changchun University of Science and Technology,Changchun,Jilin 130022,China.)

机构地区：[1]吉林大学工程仿生教育部重点实验室,吉林长春130022 [2]长春理工大学机电工程学院,吉林长春130022

出　　处：《排灌机械工程学报》2019年第9期746-751,762,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51375204);吉林省科技发展计划项目(20140101056JC)

摘　　要：采用数值计算的方法对抽油泵泵筒与织构表面柱塞间流场进行研究,分析不同间隙值和进出口压差对抽油泵漏失比、承载力比以及摩擦系数比的影响.结果表明:柱塞表面织构对环隙内部压力场、速度场有影响;在相同工况下,随着间隙值的增大,环隙内流量增大,油液平均速度增大,造成织构对速度场和压力场分布影响变大,致使其漏失比和摩擦系数比减小、承载力比增大;在相同工况下,随着进出口压差值的增大,间隙内部压力梯度增大,油液平均速度增大,由于织构对流场的影响,使得抽油泵漏失比和摩擦系数比减小、承载力比增大.因此,实际油田中合理应用表面织构化的柱塞,选取较大泵隙、较大进出口压差工况可充分发挥织构对油液的作用,可有效减小抽油泵的漏失量、减少柱塞的磨损,实现提升泵效、延长柱塞使用寿命的目标.The flow field between barrel and plunger with surface-textured in a pumpjack was investigated numerically by using CFD method and effects of size of the gap between the barrel and the plun-ger and pressure difference on pump jack oil leakage flow ratio,load-carrying capacity ratio and friction coefficient ratio were analyzed.Results show that the texture on the plunger surface affects the pressure and velocity fields in the gap.Under the same pressure difference,the oil leakage flow ratio and oil mean velocity in the gap increase with increasing gap size.As a result,the influence of the texture on the velocity and pressure fields gets dominated,resulting in a decrease in both leakage flow ratio and friction coefficient ratio,and an increase in load-carrying capacity ratio.For the same gap size,with the increase of pressure difference,the pressure gradient in the gap rises,and the mean velocity becomes fast.Due to the influence of texture on the flow field,the leakage flow ratio and friction coefficient ratio decrease but the load-carrying capacity ratio increases.This suggests that surface-textured plungers should be applied in oil fields properly.A bigger gap size and a larger pressure difference will allow the surface-textured to demonstrate a resisting effect on the oil fully.In sequence,oil leakage through the gap can be reduced effectively and wear of the plunger can be mitigated to achieve the objectives such as improvement of pump efficiency and prolonging service life-span of the plunger.

关 键 词：抽油泵柱塞 织构 漏失比 承载力比 摩擦系数比 

分 类 号：S277.9[农业科学—农业水土工程] TE933[农业科学—农业工程]