排灌机械工程学报2013，Vol.31Issue(6)：501-505,516,6.DOI:10.3969/j.issn.1674-8530.2013.06.009
水轮发电机组上机架共振分析及补气减振
Research on upper bracket resonance and air admission damping of hydroelectric unit
摘要
Abstract
The stability test research for turbine generator set of Himmetli power station showed that the vibration amplitude of upper bracket was out of limits in specific load zone.Based on the measured experimental data,the relationship between vibration signals of upper bracket and pressure pulsation signals of spiral case inlet,head cover and draft tube is analyzed.The dynamic characteristics of upper bracket and stator bracket are analyzed and the natural frequency is obtained.The results show that the frequency of turbine pressure pulsation in the load zone is close to the natural frequency of upper bracket,which leads to the resonance of structure of the upper bracket.The test of air admission for vibration reduction,adding high pressure air from head cover into runner,has also been done.The results show that,through the spectrum analysis of the pressure pulsation signals of spiral case inlet,head cover and draft tube after air admission,the frequency which causes resonance has disappeared and the vibration amplitude has been reduced greatly.Based on the actual situation of power plant,some practicable measures of air admission,that is,inserting the pressure air compensating pipe under the original natural air compensating valve side,are proposed.After putting these measures into practice,no resonance phenomenon occurs when the unit operates in that specific load zone.关键词
水轮机/上机架/共振/模态分析/压力脉动/补气Key words
turbine / upper bracket / resonance / modal analysis / pressure pulsation / air admission分类
建筑与水利引用本文复制引用
傅丽萍,阎宗国,吴烈龙,支发林,王正伟..水轮发电机组上机架共振分析及补气减振[J].排灌机械工程学报,2013,31(6):501-505,516,6.基金项目
国家自然科学基金资助项目(51279205) （51279205）
