长短叶片转轮动静干涉引起的水力激振模态数值分析
Numerical Study of Hydraulic Excitation Modes Caused by Rotor-stator Interaction of a Runner with Splitters
管子武 1何胜明 2梁权伟 1康文喆 1张健 2曾杰 2王钊宁 1何启源1
作者信息
- 1. 东方电气集团东方电机有限公司,四川省德阳市 618000
- 2. 雅砻江流域水电开发有限公司,四川省成都市 610000
- 折叠
摘要
本文以5个长叶片和5个短叶片转轮(活动导叶数为16)为例,通过数值计算,分析了长短叶片转轮的动静干涉引起的水力激振模态问题.结果表明,长短叶片转轮动静干涉引起的水力激振模态比较复杂.在无叶区,水力激振模态"节径"数为相应倍频数,如5倍转频对应5"节径"等;在双叶栅区,激振力模态既有长(短)叶片数的特征(如15倍转频的模态的节径数为1),又有叶片总数的特征(如20倍转频的节径数为4,且模态旋转方向与转轮旋转方向相同).本文的研究为长短叶片转轮的水泵水轮机的结构避振提供了新的方向.
Abstract
In this paper,the hydraulic excitation modes caused by rotor-stator interaction of the runner with 5 main blades and 5 split blades(the number of guide vanes is 16)are studied by numerical method.The results show that the hydraulic excitation modes of the type of runner are complicated.In the vaneless zone,the number of the diametrical"node"of the excitation mode of the frequency is the same with the multiple of the rotating frequency,e.g.,5 times the rotating frequency corresponds to 5 diametrical"node",etc.In the flow passage of the guide vanes and stay vanes,the excitation modes are characterized by both the number of main(or splitter)blades and the number of total blades,such as a one-nodal diametrical mode shape is found for the 15 times the rotating frequency,and the node number of diametrical model of the 20 times the rotating frequency is 4 with the rotational direction of the mode being the same as the direction of rotation of the runner.The study here will be beneficial to assess the structural vibration of the pump turbine whose runner is with split blades.
关键词
水泵水轮机/长短叶片转轮/动静干涉/水力激振模态/数值计算Key words
pump turbine/runner with split blades/rotor-stator interaction/hydraulic excitation mode/numerical study引用本文复制引用
出版年
2024
NETL
NSTL
万方数据