高水头平面闸门流激振动的数值模拟

针对高水头下平面闸门在启闭过程中受水流脉动压力作用可能引起强烈振动而容易发生破坏的问题,以某水电站导流底孔中工作闸门为例,采用势流体流固耦合理论,利用ADINA有限元软件建立水体—闸门流固耦合模型,通过输入水力学模型试验实测脉动压力时程曲线,计算分析了闸门局部开启时的流激振动特性,获得了闸门振动应力、位移、速度、加速度等分布规律,并根据闸门相关振动控制标准,判断出该闸门结构振动较轻微,满足标准要求。

Numerical Simulation on Fluid-induced Vibration of High-head Plane Gate

In the process of lifting and closing, the high-head plane gate is easily damaged, because of the strong vibration probably by pulsating pressure of flows. A operating gate in the diversion hole of certain hydropower station was taken for an example. Applying the potential fluid theory for fluid solid coupling, a coupling analysis model of gate-water was built by ADINA. As the time-history curve of pulsating pressure measured by hydraulic model experiment was input, the flow-induced vibration characteristics of gate in partly opening were calculated, and the distribution rules of vibrating displacement, stress, velocity, acceleration were studied. In addition, related control standards of gate vibration were discussed, in view of which, the safety evaluation of gate vibration was carried out.