油气管道弯管肘部二次流动侵蚀数值模拟

Numerical Simulation on Secondary Flow Erosion at Elbow of Oil and Gas Pipeline

关于管道二次流动的系统分析较少。为此,利用CFD仿真模拟弯管冲蚀,计算不同流速以及不同颗粒直径对于管道肘部二次流动冲蚀的影响,分析冲蚀和空蚀耦合时管道肘部的侵蚀情况以及耦合作用对肘部二次流动的冲蚀产生的影响。分析结果表明:管道冲蚀最严重的区域主要集中在弯管肘部靠近出口处的外壁面以及肘部出口直管段内壁面;颗粒直径增加,因二次流动产生的在肘部出口直管段内壁面冲蚀会相应减弱;当流速增大时,受到二次流动驱动的颗粒增多,在肘部出口直管段内壁面产生的冲蚀更加严重;高流速时,出口直管段受二次流动影响的冲蚀中心区域逐渐减小。所得结论可为管道的安全运行及检测提供理论参考。

Erosion caused by secondary flow has rarely reported.CFD was used to simulate the erosion of elbow, calculate the influences of flow rate and particle diameter on the secondary flow erosion of pipeline elbow, and analyze the erosion of pipeline elbow at the time of erosion and cavitation coupling and the influence of coupling effect on the secondary flow erosion of elbow.The analysis results show that the most severe erosion areas of the pipeline are mainly concentrated on the outer wall of the elbow near the outlet and the inner wall of the straight pipe section at the elbow outlet.With the increase of particle diameter, the erosion on the inner wall of the straight pipe section at the elbow outlet caused by secondary flow becomes weaker.When the flow rate increases, the particles driven by secondary flow increase, and the erosion on the inner wall of the straight pipe section at the elbow outlet becomes more serious.At high flow rate, the erosion center area of the outlet straight pipe section affected by secondary flow gradually decreases.The conclusions provide a theoretical reference for the safe operation and detection of pipelines.