摘要
底轴驱动式翻板闸门结构的泄水方式系门顶溢流,射流下方形成的密闭空腔常常造成不稳定振荡源,从而诱发闸门结构强烈振动,对结构安全运行造成严重威胁。通过水弹性振动模型试验研究了底轴驱动式翻板门的水力特性和闸门结构的流激振动特性,观测了闸门运行过程中的水流流态,取得了作用于闸门结构的水流脉动压力,给出了闸门结构的流激振动加速度、位移及应力等动力响应参数,通过随机数据分析获得了各种动力参数的谱特征和安全性评价数据。在此基础上,对影响翻板门运行安全稳定的射流空腔通气问题进行系统试验研究,提出了门顶设置破水器的优化布置方案和闸墩两侧设置通气孔的补气措施,避免了不稳定负压空腔可能产生的压力振荡。
The bottom-shaft-driven flap gate is a new type of gate used for urban water environment renovation and construction. Because thedischarge mode of the gate structure is the top overflow of the gate, the closed cavity formed under the jet often causes the unstable oscillation source, which induces the strong vibration of the gate structure and poses a serious threat to the safe operation of the structure. In this paper, the hydraulic characteristics and the flow-induced vibration characteristics of the bottom-shaft-driven flap gatewere studied through the hydro elastic vibration model test. The flow state of the water flow during the operation of the gate was observed and the pulsating pressure load act-ing on the gate structure was achieved. The dynamic response parameters such as flow-induced vibration acceleration, dynamic displacement and dynamic stress of the gate structure were given. The spectral characteristics and safety evaluation data of various dynamic parameters were obtained through random data analysis. On this basis, a systematic experimental study was conducted on the jet cavity ventilation problem af-fecting the safe and stable operation of the gate. The optimal layout of the water breaker at the top of the gate and the gas filling measures on both sides of the pier were put forward to solve the problem of pressure oscillation in the unstable negative pressure cavity and good results had been obtained.
作者
徐惠民
严根华
陈照
XU Huimin;YAN Genhua;CHEN Zhao(Nanjing Water Conservancy Planning and Design Institute Co.,Ltd.,Nanjing 210022,China;Nanjing Hydraulic Research Institute,Nanjing 210029,China)
出处
《人民黄河》
CAS
北大核心
2018年第7期108-112,共5页
Yellow River
关键词
水力特性
流激振动
优化设计
底轴驱动翻板门
hydraulic characteristics
flow-induced vibration
optimal design
bottom-shaft-driven flap gate
