摘要
为了对大跨度齿轮驱动旋转式弧形下卧门运行安全性进行评估,采用不同运行工况下的水流流态、水流脉动压力和波高等水力参数,应用水弹性振动模型测试不同运行水位、闸门开度条件下的结构振动加速度及振动位移。在此基础上对闸门全开平卧、全关挡潮及旋转180°上翻检修等全工况条件下的启闭力进行测试,并通过有限元分析下卧门结构在正常挡潮、风浪超高等工况时闸门结构位移、应力分布以及结构流固耦合振动特性,以及对通航孔下卧门的运行安全性进行分析。结果表明,闸门在开度0.4或0.5时出现流态转换现象,在流态转化区易引发下游三滚波浪或二滚波浪,相应水流脉动压力荷载也明显增强,但规范操作情况下一般不会产生强烈的振动现象。水流脉动压力主要集中在1 Hz以内的低频区,不会产生对闸门结构的共振现象。在闸门启闭过程中,由于底水封的作用,门顶溢流引起的闸门下游面板脉动压力要大于凹槽内上游弧面面板的脉动压力。下卧门在正常运行状态下,其启闭力满足启闭机设计容量,闸门最大启闭力出现在空载调试状态。该研究成果以及提出的安全运行操作建议可为类似超大型水闸工程提供参考。
In order to evaluate the operation safety of large-span gear-driving rotary-type radial steel gate,the hydraulic parameters of water flow pattern,fluctuating pressure and wave height under different operation conditions are adopted,and the vibration acceleration and displacement of the structure under different operation water levels and gate openings are measured by hydroelastic vibration model.On this basis,the opening and closing forces of the gate are tested under all working conditions,such as full opening and lying down,full closing and 180 turning upwards for maintenance.The displacement and stress distribution of the gate structure and the fluid-structure coupling vibration characteristics of the gate structure under normal tide blocking load,super high wind-driving wave loads are analyzed by finite element method,and the operation safety of the gate under the navigation hole is analyzed.The results show that the flow pattern transition occurs when the gate opening is 0.4 or 0.5,and it is easy to cause three or two rolling waves downstream in the flow pattern transition zone,and the corresponding fluctuating pressure load of water flow is obviously enhanced,but the strong vibration phenomenon generally does not occur under standard operation.The fluctuating pressure of water flow is mainly concentrated in the low frequency region within 1 Hz,which will not produce resonance phenomenon to the gate structure.Under the normal operation state,the opening and closing force of the gate meets the design capacity of the hoist.The research results and suggestions for safe operation can provide reference for similar super-large sluice projects.
作者
冯梦雪
严根华
董家
FENG Mengxue;YAN Genhua;DONG Jia(China Water Resources Pearl River Planning,Survering&Designing Co.,Ltd.,Guangzhou,Guangdong 510610,China;Nanjing Hydraulic Research Institute,Nanjing,Jiangsu 210029,China;State Key Laboratory of Hydrology-water Resources and Hydraulic Engineering,Nanjing,Jiangsu 210029,China)
出处
《水利与建筑工程学报》
2023年第5期111-121,共11页
Journal of Water Resources and Architectural Engineering
基金
水利部重大科技项目“河口区超大跨度挡潮闸建设关键技术研究”(SKS-2022116)。
关键词
大跨度齿轮驱动旋转式弧形下卧门
水动力特性
流激振动
动力特性
启闭力
longspan rotarytype radial steel gate
hydrodynamic characteristic
flowinduced vibration
dynamic characteristic
hoisting force
