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Comparative Analysis of Dynamic Characteristics of Runner Cracks under High and Low Head Conditions
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Comparative Analysis of Dynamic Characteristics of Runner Cracks under High and Low Head Conditions
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Journal Article
Comparative Analysis of Dynamic Characteristics of Runner Cracks under High and Low Head Conditions
2025
Overview
This study investigates the influence mechanism of blade crack morphological characteristics on runner dynamic characteristics through numerical simulation, with a specific focus on abnormal vibration events occurring during the commissioning phase of a pumped storage unit. Based on field observations of spontaneous vibration cessation and subsequent crack damage features, a model incorporating three-dimensional parametric crack modeling was established. A systematic comparative analysis of modal response characteristics was conducted for runners under both high-head and low-head conditions. Computational results demonstrate that the high-head runner exhibits markedly greater stress levels and sensitivity to crack defects than its low-head counterpart. This research provides a theoretical foundation for early-stage vibration fault identification and damage localization in pumped storage units.
Publisher
IOP Publishing
