Elbows in pneumatic conveying systems are normally prone to the erosive effects of conveyed particles. There are a number of solutions available to reduce such damage. A widely used geometric alternative for replacing the 90° elbow and reducing erosive wear is the plugged tee. Another option, although less commonly used, is the vortex-chamber elbow. In both cases, the effective reduction in erosion brought about is unclear, as it strongly depends on the operating conditions. The present study assesses relative erosion among the plugged tee, vortex-chamber elbow, and standard elbow for a dilute gas–solid multiphase flow. A numerical model is employed to predict the penetration ratio and validated using experimental data for the plugged tee. Simulations are run for the standard and vortex-chamber elbows and plugged tee under the same conditions to compare the mechanics involved and the relative erosion reduction. The analysis uses variables relating to particle–wall interactions (impact angle, impact velocity, impact frequency) to illustrate the nature of the erosive process in each pipe fitting. In general, the geometric configurations of both the plugged tee and vortex-chamber elbow promote changes in particle dynamics that reduce the rate of erosion. On the basis of the relative erosion of the standard elbow, the plugged tee proves to be an interesting option in cases of a low mass loading, while the vortex-chamber elbow demonstrates its erosion reduction potential for higher mass loading conditions. Furthermore, the advantages and disadvantages of each fitting are highlighted.

气动输送系统中的弯头通常容易受到输送颗粒的侵蚀作用。有许多解决方案可以减少此类损坏。堵塞的三通是替代90°弯头并减少腐蚀磨损的一种广泛使用的几何替代方案。尽管不太常用，但另一个选择是涡室弯头。在这两种情况下，能否有效减少腐蚀尚不清楚，因为这很大程度上取决于操作条件。本研究评估了稀释的气固多相流在三通，旋流室弯头和标准弯头之间的相对腐蚀。使用数值模型来预测渗透率，并使用堵塞三通的实验数据进行验证。在相同条件下对标准弯头和涡流弯头以及三通插塞进行了仿真，以比较所涉及的力学和相对的腐蚀减少量。该分析使用与颗粒-壁相互作用有关的变量（冲击角，冲击速度，冲击频率）来说明每个管道配件中腐蚀过程的性质。通常，三通和旋流腔肘部的几何构型都会促进颗粒动力学的变化，从而降低腐蚀速率。基于标准弯头的相对腐蚀，在低质量载荷的情况下，三通被证明是一个有趣的选择，而涡室弯头则显示出在更高质量载荷条件下的腐蚀降低潜力。此外，突出了每种配件的优点和缺点。