排灌机械工程学报2024，Vol.42Issue(8)：802-809,8.DOI:10.3969/j.issn.1674-8530.23.0165
泥沙粒径对轴流式水轮机磨损特性的影响
Influence of sediment particle size on wear characteristics of Kaplan turbines
摘要
Abstract
To understand and clarify the sediment wear attributes of Kaplan turbines,a certain power station turbine was taken as the research object,and a numerical investigation of solid-liquid two-phase flow was carried out based on the Eulerian-Lagrangian multiphase flow model.The central focus centered on elucidating the influence of sediment particle size on both erosion rate and distribution across the turbine components.Research findings show that the high-risk region for sediment erosion is near the wheel rim of the blade pressure side and the suction side.With increasing sediment grain size,erosion intensifies on the blade pressure side while diminishes on the suction side,leading to a gradual contraction of this erosional region towards the proximity of the wheel rim.Particles are influenced by the leakage vortex,forming strip-shaped erosion scars along the rotation direction on the wall of the runner chamber.The erosion rate gradually decreases in the draft tube cone section,the differences in the degree of wear in different outlet flow passages increase and the sediment particles form belt-like spiral erosion scars along the extension direction of the leakage vortex in the cone section.During the Kaplan turbine operation,the draft tube section experiences the most substantial erosion followed by the runner and the runner chamber.Prolonged turbine operation under conditions of excessively small or large sediment diameters should be avoided,and during maintenance,particular attention should be paid to the sediment wear of the runner blades and the runner chamber.By identifying high-risk region of sediment erosion during the operation of the Kaplan turbine,a reference is provided for the quantita-tive analysis of sediment wear in various flow passage components.It helps in scheduling maintenance intervals for the turbines and provides a theoretical basis for further optimization in the design of Kaplan turbine.关键词
轴流式水轮机/泄漏涡/固液两相流/泥沙磨损Key words
Kaplan turbine/leakage vortex/solid-liquid two-phase flow/sediment wear分类
农业科技引用本文复制引用
王彤,李晓飞,郭鹏程,张健,范文睿,陈红吉..泥沙粒径对轴流式水轮机磨损特性的影响[J].排灌机械工程学报,2024,42(8):802-809,8.基金项目
国家自然科学基金资助项目(51839010) （51839010）
中国博士后科学基金资助项目(2021M702641) （2021M702641）
国能大渡河检修安装有限公司科技项目(JX-KY-2022-03) （JX-KY-2022-03）
