水利水电科技进展Issue(5)：75-79,5.DOI:10.3880/j.issn.10067647.2014.05.015
混流式水轮机转轮振动特性
Vibration properties of a Francis turbine runner
李海亮 1王铭 1李国慧1
作者信息
- 1. 浙江富春江水电设备有限公司，浙江 杭州 310013
- 折叠
摘要
Abstract
In this paper, we apply the finite element method to build a model based on flow-solid coupling modal analysis theory in order to capture the vibration characteristics of operating a Francis turbines and the law of effect of components on natural frequencies of wheels. The overall results show that the natural frequencies of wheels with various vibration modes reduce at different levels under the influence of water. Specifically, the ratios of correspondingly frequencies in water of overall vibration modes such as turning, bending and lifting to those in air are gradually decreased with exception of the ratio of blades. Furthermore, it is difficult to avoid resonance phenomenon for wide corresponding frequency domain of blades vibration, and that natural frequencies of wheels will reduce when thickness of higher canopy reduced, and only natural frequencies of turning, bending and lifting of wheels as well as the waterside reinforcing wheels will increase when the lower canopy reduced. By combining the results of analysis and impact factors, we have proposed measures to improve state of wheels vibrating in water, including compensating air, trimming blades outlet, improving cone-shaped form of drain, and adding stabilizers.关键词
混流式水轮机/转轮/振动特性/固有频率/流固耦合Key words
Francis turbine/runner/vibration property/natural frequency/fluid-structure coupling分类
能源科技引用本文复制引用
李海亮,王铭,李国慧..混流式水轮机转轮振动特性[J].水利水电科技进展,2014,(5):75-79,5.
