水轮机流道压力脉动引起的厂房振动研究与评估

Research on Vibration of Powerhouse Vibration Caused by Pressure Pulsation of Hydro-turbine

水轮机压力脉动是引起厂房振动的主要诱因之一。本文运用ANSYS有限元软件模拟了水轮机流道内压力脉动诱发的厂房振动问题,结合电站特点推荐振动控制值,对振动进行评估和分析,结果表明:采用将压力脉动时间历程曲线载荷施加在顶盖、蜗壳和尾水管内壁上,进行瞬态动力响应分析的方案在技术上是可行的;机组压力脉动引发的厂房下部基础振动响应幅值很小,完全满足标准规定的限值;在厂房的结构设计时,自振频率应避开水力激振频率,防止机组运行时引起较大的厂房振动。

The main cause of plant vibration is hydro-turbine pressure pulsation. The vibration problem of hydraulic turbine induced by pressure pulsation is simulated by using ANSYS, recommends vibration control value according to the characteristics of power station, reviewed and analyzed vibration, the results show that it is technically feasible to apply pressure fluctuation time history curve load on the top cover, volute and draft tube inner wall for transient dynamic response analysis. The amplitude of the vibration response of the lower part of the workshop caused is very small by the pressure pulsation, which fully meets the requirements of the standard. In the structural design of the powerhouse, the natural frequency must be avoided from the hydraulic excitation frequency to prevent the vibration of the powerhouse caused by the operation of the unit.