On the influence of geometrical parameters and erosive wear on the dynamic behaviour of Pelton turbine runners

IF 6 Q1 ENGINEERING, MULTIDISCIPLINARY
Maxime Chiarelli , David F. Vetsch , Robert M. Boes , Loïc Andolfatto , Cécile Münch-Alligné
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引用次数: 0

Abstract

Hydro-abrasive erosion and material fatigue are amongst the main challenges for Pelton turbines. Erosive wear caused by sediment-laden water, significantly impacts turbine efficiency, time between overhaul and service life. While surface coatings and operational adjustments, like shutdowns during high sediment concentration events, offer some mitigation, damage assessment still relies on visual inspections and associated downtime. This study aims to understand the dynamic behaviour of a prototype Pelton runner by examining the influence of boundary conditions as well as the hub and bucket designs on the runner's vibration modes. Additionally, four erosion scenarios are investigated through numerical modal simulations on a single bucket geometry, by removing material from specific erosion-affected locations. The results indicate a weak correlation between main splitter erosion and frequency shifts for all modes. The most realistic erosion scenario, which includes the erosion of a large surface in the bucket intrados, reveals the balanced effect of mass loss and stiffness reduction resulting from material removal. Consequently, most vibration modes remain unaffected by this realistic scenario, except two modes which show significant frequency shifts. These findings enhance the understanding of the dynamic behaviour of Pelton turbines. Moreover, understanding the impact of common wear on Pelton runners is crucial for developing advanced vibration-based monitoring tools that would enhance turbine safety and minimize downtime.
几何参数和冲蚀磨损对水轮机转轮动力特性的影响
水力磨蚀和材料疲劳是Pelton涡轮机面临的主要挑战。含沙水造成的冲蚀磨损,严重影响汽轮机效率、大修间隔时间和使用寿命。虽然表面涂层和操作调整(如在高沉积物浓度事件期间关闭)提供了一些缓解措施,但损害评估仍然依赖于目视检查和相关的停机时间。本研究旨在通过检查边界条件以及轮毂和铲斗设计对流道振动模式的影响来了解原型Pelton流道的动态行为。此外,通过从特定侵蚀影响位置移除材料,在单个桶的几何形状上通过数值模态模拟研究了四种侵蚀情景。结果表明,主分离器侵蚀与各模态的频移之间存在微弱的相关性。最现实的侵蚀场景,包括桶内大面积表面的侵蚀,揭示了材料去除造成的质量损失和刚度降低的平衡效应。因此,大多数振动模式不受这种现实情况的影响,除了两种模式显示出显著的频移。这些发现增强了对佩尔顿涡轮机动态行为的理解。此外,了解常见磨损对Pelton转轮的影响对于开发先进的基于振动的监测工具至关重要,这些工具可以提高涡轮机的安全性并最大限度地减少停机时间。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Results in Engineering
Results in Engineering Engineering-Engineering (all)
CiteScore
5.80
自引率
34.00%
发文量
441
审稿时长
47 days
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