Most previous studies of solid particle erosion in elbows considered an elbow for which the upstream length is long (L/D> 100) and flow is well developed before reaching the elbow. But, in this study, experiments were conducted for two elbows in series, one in vertical upward-horizontal orientation and the second one placed after L/D = 6 in horizontal-vertical downward orientation. Erosion experiments were conducted with liquid-sand and liquid-gas-sand flow conditions in an experimental facility with two test section configurations: metallic elbows in series for erosion measurements and acrylic elbows in series for erosion pattern visualization. The experiments include erosion measurements of both metallic elbows with ultrasonic wall thickness (UT) measurements. All experiments including flow visualization of erosion pattern were conducted for both elbows for liquid dominated flows, and the results comparing the erosion ratio of the second elbow to the first elbow are presented. In addition, Computational Fluid Dynamics (CFD) simulations have been performed and compared to the experimental erosion patterns with both erosion pattern visualization and UT measurements. The results show good agreement between experiments and CFD simulations and experimental results provide a database for improving erosion modeling in liquid dominated flows.
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机译：先前有关肘部固体颗粒侵蚀的大多数研究都认为，肘部的上游长度较长（L / D> 100），并且在到达肘部之前流动性很好。但是，在这项研究中，对两个肘部进行了一系列实验，一个肘部垂直于水平方向，第二个肘部在L / D = 6之后沿水平-垂直方向向下放置。在具有两个测试部分配置的实验设施中，在液砂和液气砂流动条件下进行了侵蚀实验：串联的金属肘用于侵蚀测量，串联的丙烯酸肘用于侵蚀图案可视化。实验包括对两个金属弯头的腐蚀测量以及超声壁厚（UT）测量。对液体为主流的两个弯头都进行了包括腐蚀模式的流动可视化在内的所有实验，并给出了比较第二弯头与第一弯头的腐蚀率的结果。此外，已经进行了计算流体动力学（CFD）模拟，并通过腐蚀模式可视化和UT测量与实验腐蚀模式进行了比较。结果表明，实验与CFD模拟之间具有良好的一致性，实验结果为改善液体主导流中的侵蚀模型提供了一个数据库。
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