压裂泵头体排液过程的非定常流动数值模拟  

Unsteady Flow Simulation of Fracturing Pump-head Fluid Discharge Process

作　　者：魏超 周思柱[1] 李美求[1] WEI Chao;ZHOU Si-zhu;LI Mei-qiu(Institute for Strength and Vibration of Mechanical Structures, Yangtze University, Jingzhou, Hubei 434023)

机构地区：[1]长江大学机械结构强度与振动研究所,湖北荆州434023

出　　处：《液压与气动》2022年第4期26-33,共8页Chinese Hydraulics & Pneumatics

基　　金：国家科技重大专项(2016ZX05038-001-LH002);国家自然科学基金(51674040)。

摘　　要：相贯线处高速流体冲击会加速泵腔局部腐蚀和裂纹萌生,缩短泵头体服役寿命。为得到相贯线处流速变化规律,联合泵阀及柱塞的运动方程和动网格技术,模拟了不同排出压力、柱塞冲次、柱塞直径及压裂液黏度条件下泵头体排液过程,拟合了相贯线处的流速预测公式。结果表明:左右两侧相贯线处的流速高于邻近区域,曲柄转角位于262°~328°时,右侧相贯线处的流速相对稳定;相贯线处流速对排出压力不敏感;增大柱塞冲次,相贯线处的流速线性增大;柱塞直径增大,相贯线处流速呈比例增大;而黏度对流速的影响取决于柱塞冲次;拟合得到的流速预测公式的误差低于2.35%。模拟结果可为泵头体流动加速腐蚀试验研究提供理论依据。The high-speed fluid impulse at the intersecting line causes the acceleration of local corrosion and crack initiation,and shortens the service life of the pump-head.The fluid flow velocity during the pump-head discharge process was simulated under different discharge pressure,plunger frequency,plunger diameter and fracturing fluid viscosity with the aid of dynamic mesh technology and motion equations of valve and plunger.And the prediction model for the flow velocity was fitted.The results show that the flow velocity at the intersecting line of the left and right sides is higher than surrounding area,and the flow velocity of the right side is more stable while crank angle is between 262°and 328°.The flow velocity increases linearly with the increasing of plunger frequency,and increases proportionally as the plunger diameter increasing,but not sensitive to discharge pressure.The influence of fracturing fluid viscosity on the flow velocity depends on plunger frequency.The prediction error of the flow velocity model is less than 2.35%.Above results could provide a theoretical basis for the experimental study on flow accelerated corrosion of the pump-head.

关 键 词：泵头体 排液过程 数值模拟 流速 流动加速腐蚀 

分 类 号：TH137[机械工程—机械制造及自动化] TE925[石油与天然气工程—石油机械设备]