关键词: 异常振动, 现场试验, 模型试验, 压力脉动, 水轮机出力

Abstract:

Taking the 600 MW Francis turbine generator unit that is independently researched and developed by domestic institutes and then put into operation in a large hydropower station as a study object, the abnormal vibration and insufficient maximum output of the unit in high-load operation are studied through problem genesis mechanism analysis and failure diagnosis. The causes of the abnormal vibration are first analyzed, and the improvement scheme is proposed according to the field test results of unit stability and output. By trimming the outlet edge of the runner blade and modifying the runner cone, in combination with comparison and analysis of numerical simulation and simultaneous model test results, the problems of abnormal vibration and insufficient maximum output of the unit in high-load operation are successfully solved, on the basis of which, a general and relatively complete problem analysis and solution formula is summarized. 

Key words: abnormal vibration, field test, model test, pressure pulsation, turbine output