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采用计算流体动力学方法分析管道-外部流体相互耦合效应对管道连接点应力影响。以垂直输送管道系统为研究对象,应用数值方法求解外部流体-管道进行流固耦合这一非线性问题。研究结果表明:1)扬矿硬管上端无论是固接还是铰接,外部流场以不同速度冲击管道,应力集中出现在管道靠近连接区域,最大应力也出现在管道连接点处,其余部位管道应力变化较小;2)其最大等效应力随着外部流场速度增大而增大,以固接方式连接产生的管道最大等效应力总是大于以铰接方式连接的最大等效应力。3)当外部流体速度为0.9m/s时,两种连接产生的最小应力值在该流速点均出现局部极小值,且固接时局部极小应力小于铰接时的局部极小应力。
Computational fluid dynamics (CFD) method was used to analyze the influence of pipe-to-outside fluid coupling on the stress at pipe joints. Taking the vertical pipeline system as the research object, a numerical method is proposed to solve the nonlinear problem of external fluid-pipe fluid-structure coupling. The results show that: 1) the upper end of the pipe jacking pipe is either fixed or hinged, the external flow field impinging on the pipe at different speeds, stress concentration occurs in the pipe near the connecting area, the maximum stress also appears at the pipe connection point, the rest pipe stress The maximum equivalent stress increases with the increase of the external flow field velocity, the maximum equivalent stress of the pipeline produced by the fixed connection is always greater than the maximum equivalent stress hingedly connected. 3) When the external fluid velocity is 0.9m / s, the minimum stress value produced by the two kinds of connections appears local minimum at this velocity point, and the local minimum stress is smaller than the local minimum stress when hinged.