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建立了热流固耦合控制方程,借助Fluent和Ansys软件对多相介质流经管道弯头进行了流场和应力、应变分析,探讨了不同入口速度、管径、弯径比、流体温度对弯头冲蚀失效的影响。研究表明:弯管内壁面剪切应力的大小和分布受多重因素的影响;最大壁面切向应力分布在弯头两颊或下游外拱壁面处,且受流体温度的影响;热应变最大位置出现在弯头两颊和内拱壁面。弯管两颊和下游外拱壁面冲蚀破坏最为严重,为失效高发区。适当降低流速、增大管径和弯径比、升高流体温度均可以有效缓解管道的冲蚀破坏。研究结论可为进一步研究多相混输管道冲刷腐蚀机理提供理论依据。
The governing equations of thermal fluid-solid coupling are established. Flow field and stress and strain analysis of multiphase media flowing through the pipe elbow are carried out by Fluent and Ansys software. The effects of different inlet velocities, pipe diameters, Impact of erosion failure. The results show that the size and distribution of shear stress on the inner wall of the elbow are affected by multiple factors. The maximum wall tangential stress is distributed on the outer arch wall at the two cheeks or downstream, and is affected by the fluid temperature. The maximum position of thermal strain appears Elbow cheeks and arch walls. Elbow bend and downstream arch wall erosion damage the most serious failure for high incidence areas. Appropriate to reduce the flow rate, increase diameter and diameter ratio, increase the fluid temperature can effectively alleviate pipeline erosion damage. The conclusion of the research can provide a theoretical basis for further research on erosion and erosion mechanism of multi-phase mixed pipelines.