充液直圆管道水体固有频率分析  

Analysis of the inherent frequency of water in a cylinder pipe

作　　者：李光旭[1] 李万平[1] 李环[1] 

机构地区：[1]华中科技大学土木工程与力学学院,武汉430074

出　　处：《水动力学研究与进展（A辑）》2008年第2期134-140,共7页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金项目(10372033);长江水利委员会勘查设计资助项目

摘　　要：针对三峡电厂引水系统出现的可能是由水体共振所引起的异常强烈振动现象,本文给出了压力管道压力脉动的控制方程,并由此方程出发导出了直圆管在开端和闭端条件下的水体固有频率计算公式。本文推导分别考虑了管壁变形和刚性壁两种情况,并分析了影响水体固有频率的主要因素。本文还采用瞬态动力响应仿真软件进行了数值模拟,计算得到的水体固有频率与按本文给出的理论公式计算值很接近。比较结果验证了本文推导所得公式的可行性。数值模拟还表明,低流速下水的速度或流量对水体固有频率没有影响。To analyze the strong abnormal vibration phenomenon probably caused by the water body resonance that happened in the Three Gorges hydropower station, the governing equation is given for the fluctuating pressure. With this equation we derived the formula of the inherent frequency of water in open and closed pipes when the pipe is considered as a deformable material or as a rigid wall. Meanwhile we used a dynamic response analyzing software to simulate the water body resonance. The results show that the numerical value of the inherent frequency of water is very close to the theoretical value given by the derived formula. The numerical result also shows that the inherent frequency has no relation to the water velocity under the condition of low velocity.

关 键 词：水体共振 压力波 固有频率 数值模拟 

分 类 号：TV134[水利工程—水力学及河流动力学]