摘要
导轴承是立式水轮发电机组的重要支撑部件,对机组轴系的转子动力学特性有很大的影响。导轴承数量(机组型式)不同,轴系的临界转速将不同,若临界转速与机组转速相接近,轴系可能出现共振。以一大型立式轴流式机组为研究对象,基于轴系运动方程和流体润滑Reynolds方程,分析了不同导轴承数量时机组轴系临界转速。计算结果表明,半伞式机组由于缺乏下导轴承约束,大轴摆度偏大;增加下导轴承后大幅提高了轴系的临界转速;临界转速还随着导轴承数量的增加而增大。
Guide bearing is an important supporting component of vertical hydroelectric generating units,which has a significant impact on the rotor dynamic characteristics of the unit shafting.If the number of guide bearings(unit type)is different,the critical speed of shafting will be different.If the critical speed is close to the unit speed,the shafting resonance may occur.Taking a large vertical Kaplan unit as the research object,based on the shafting motion equation and the Reynolds equation of fluid lubrication,the critical speed of the unit with different number of guide bearings was analyzed.The calculation results show that due to the lack of lower guide bearing constraint,the main shaft swing is too large.The critical speed of shafting is greatly increased by adding lower guide bearing.The critical speed also increases with the increase of the number of guide bearing.
作者
肖惠民
XIAO Huimin(School of Power and Mechanical Engineering,Wuhan University,Wuhan 430072,China)
出处
《水电与抽水蓄能》
2023年第5期1-4,共4页
Hydropower and Pumped Storage
基金
国家自然科学基金项目“复杂多变网构下水电机组稳定性机理与机网协调控制研究”(51979204)。
