Supporting data for Reducing Sediment Erosion in Francis Turbine Staggered Labyrinth Seals: A Clean Water Injection Approach

The aim of this study is to fill the gap by proposing and evaluating a new approach to reduce sediment erosion in staggered labyrinth seals. Particularly, the research introduces and reveals a clean water injection method designed to reduce the impact of sediment particles by flushing the seal region with sediment-free water. By replacing sand-laden water with clean water in the seal cavities, this approach has the potential to eliminate particle-induced erosion on both the rotor and stator surfaces of the labyrinth seal in a Francis turbine. The results showed that, under optimum condition, sediment erosion in the stator and rotor parts of the staggered labyrinth seals declines, significantly with reductions of 71 % and 68 %, respectively, relative to baseline case.本研究旨在填补相关研究空白，提出并评估一种可降低交错式迷宫密封（staggered labyrinth seals）中泥沙侵蚀的新方法。具体而言，本研究提出并验证了一种清水注入方案：通过使用无泥沙水冲洗密封区域，以弱化泥沙颗粒的侵蚀效应。通过在密封腔体中以清水替换含沙水流，该方法可有效消除混流式水轮机（Francis turbine）迷宫密封转子与定子表面因颗粒引发的侵蚀问题。研究结果表明，在最优工况下，交错式迷宫密封的定子与转子部位的泥沙侵蚀程度均显著降低，相较于基准工况分别下降71%与68%。