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基于流体力学(CFD)方法,分析了直角弯管的内部流动规律,计算结果表明:直角弯管在90°转角和下游水平管路中存在流动分离现象,同时在下游水平管路中形成明显的二次环流。在流场计算的基础上,引入Tulsa大学冲蚀与腐蚀联合研究中心(E/CRC)提供的冲蚀模型,对直角弯管的冲蚀磨损问题进行研究,分析了固体颗粒的空间分布特征和上下游管壁的最大冲蚀率以及总体质量损失,计算结果与实验数据具有良好的一致性。固体颗粒的空间分布特征依赖于流体流动特性,磨损最严重的位置发生在弯管转角处和下游管路的内侧壁面。流速、颗粒浓度和颗粒直径对最大冲蚀率有明显影响,其中,流速与最大冲蚀率呈指数增长关系,上下游管壁的速度指数分别为2.5和2.3。
Based on the CFD method, the internal flow regularity of the right-angle pipe was analyzed. The results show that the right-angle pipe has the phenomenon of flow separation in the 90 ° rotation angle and the downstream horizontal pipe. At the same time, Secondary circulation. On the basis of the flow field calculation, the erosion model of the right-angled elbow was studied by introducing the erosion model provided by Joint Research Center for Erosion and Corrosion of Tulsa University (E / CRC), analyzing the spatial distribution characteristics of solid particles and The maximum erosion rate of the upstream and downstream pipe walls and the total mass loss, the calculated results and experimental data have good consistency. The spatial distribution of solid particles depends on the fluid flow characteristics. The most severe location occurs at the corner of the elbow and the inner wall of the downstream pipe. Flow rate, particle concentration and particle diameter have a significant impact on the maximum erosion rate, of which the flow rate and the maximum erosion rate showed an exponential growth relationship, the velocity index of the upstream and downstream wall were 2.5 and 2.3.