水力自控翻板门拍振机理的研究

Research on mechanism of large amplitude self excited vibration of hydro automatic flap gate

水力自控翻板闸门因其能随水位涨落而自动启闭，结构简单、造价低廉，利于排沙等优点，在兼有蓄泄任务的各类水利工程中得到广泛的应用，并产生了很好的经济效益．然而闸门在特定水力条件下产生自激型的不稳定拍振（或称拍打）是影响该类闸门安全运行的控制因素．本文对水力自控翻板门的稳定性进行理论分析和计算，得到了稳定性指标，同时还进行了相应的实验研究，计算结果与实验结果吻合较好．分析了影响稳定性的因素，结果表明下游水位变化是影响闸门稳定性的主要因素．该成果可供有关工程设计参考．

In view of the advantages of less cost, simpler structure, automatic operation under water level changes, hydro automatic flap gates are widely used in various hydraulic projects. Howerver, the gates can induce large amplitude self excited vibration under certain flow conditions, which may cause structure failure or influence smooth operation of the gates. In this paper, a theoretical model for the dynamic stability of the vibration is developed for the gate. The predicated results are compared with the experimental date. A dynamic stability criterion is presented for designing vibration free gate.