CAJ | 학술논문

西南某电站的混流式水轮机在高于额定水头、满负荷及超负荷下，出现异常振动。分析发现振动工况特征点位于转轮运转特性曲线上叶道涡范围的部分区域内，并预测在叶道涡区域的其他部分也存在引起机组振动的特征工况点。后赴电站现场作了起始于满负荷的降负荷试验，试验数据证实了先前的预测。C FD数值分析也表明，在振动工况下，转轮叶片间存在明显涡流，则认为该电站水轮机在高水头高负荷下的振动是由叶道涡引起的。
서남모전참적혼류식수륜궤재고우액정수두、만부하급초부하하，출현이상진동。분석발현진동공황특정점위우전륜운전특성곡선상협도와범위적부분구역내，병예측재협도와구역적기타부분야존재인기궤조진동적특정공황점。후부전참현장작료기시우만부하적강부하시험，시험수거증실료선전적예측。C FD수치분석야표명，재진동공황하，전륜협편간존재명현와류，칙인위해전참수륜궤재고수두고부하하적진동시유협도와인기적。
Severe abnormal vibration appears in Francis turbines in a hydropower station of Southwest China at the higher head than the rated head and full load or overload .To investigate the reasons ,the analysis considers that characteristic points of vibration con-dition are inside a part of the channel vortex area on the runner's performance curve .And after dropping load test starting at full load in the power plant site ,the test data confirm the prediction that the other parts of channel vortex area also have analogous character-istic points of vibration conditions .The CFD analysis also demonstrates that the obvious unstable vortices exist between runner blades under the vibration condition .So the vibration of these turbines is caused by channel vortices when they operate at the zone with the higher head than the rated head and the full load or overload .