水电站厂房振动传递路径的仿真模拟及结构振动特性研究

Simulation of transmission path and study on structural vibrations of hydropower house

基于泸定水电站厂房,研究提出了水电站厂房非定常湍流、机组及混凝土结构相互作用的流固耦合振动分析方法,对流体压力脉动的振动能量传递路径进行了仿真模拟,建立了厂房全流道湍流-整体结构流固耦合振动分析的全耦合仿真模型。通过流体和固体交错迭代考虑流体和固体间的耦合作用,进行时程振动计算分析。结果表明,水轮机叶片与导叶间静动干扰所引起的流体脉动压力对厂房整体结构振动影响较为显著,座环安放处混凝土的振动相对最为剧烈,研究成果揭示了水电站厂房的整体振动规律。

This paper presents a study of structural vibration model of hydropower house with fluid-solid interaction of unsteady turbulence,overall concrete structure and hydroelectric generation sets.A fully-coupled vibration model was developed for Ludin hydropower house,and the transmission of fluid-induced pressure fluctuation was simulated.A time-integration scheme was used for the fluid and solid zones,and fluid-solid coupling was calculated by using alternative iteration.The result shows that fluid pressure fluctuations caused by static and dynamic disturbance have significant impact on structural vibrations,and that the most severe vibrations occur at the position of stay ring.Thus this work provides a useful approach to reveal vibration mechanism of hydropower house.