水利水电技术（中英文）

【目的】针对多个平面闸门在启闭过程中受水流脉动压力影响可能引起振动而易发生破坏的问题，【方法】以秦淮新河水利枢纽中某节制闸为例，研究了势流体流固耦合理论，使用ANSYS Workbench软件对多个闸门并行时紧急排水工况进行了三维仿真模拟，获得了该工况不同开度下流场压力、速度，闸门变形、应力等分布情况；对该闸门进行有水、无水工况模态分析；系统研究了闸门在0.2～0.7范围内6个开度下发生流激振动的状态。【结果】结果显示：随闸门开度增大，闸门变形、等效应力减小，流场内最值压力减小、速度减小。受脉动压力作用Y、Z向变形大于X向变形。比较数值结果发现开度较小时开度轻微变化会极大影响应力、变形等参数的变化，如开度从0.2增大至0.3时，闸门最大变形减少49.3%,最大等效应力减小59.7%,流场最值压力分别减少55.2%、54.6%。【结论】建议该闸门应尽量避免长期处在小开度下运行。湿模态情况下固有频率更低，整体发生振动的阶数更多。边缘位置的闸门变形、应力分布异常，使其更易损伤。

[Purpose]In order to solve the problem that multiple plane gate may be easily destroyed due to vibration caused by the influence of water pulsating pressure during opening and closing process, [Methods]taking a control gate in Qinhuai New River Conservancy Project as an example, the fluid-solid coupling theory of potential fluid is studied. Three-dimensional simulation of emergency drainage conditions of several gates in parallel is carried out by using ANSYS Workbench software, and the flow field pressure, velocity, gate deformation, stress and other distribution conditions in different opening degrees were obtained. Modal analysis is carried out for the gate under both water and anhydrous conditions. The flow-induced vibration of the gate at 6 openings from 0.2 to 0.7 is systematically studied.[Results]The results show that with the gate opening increasing, the deformation and equivalent stress of the gate decrease, and the maximum pressure and velocity decrease in the flow field. Deformation in Y and Z direction is larger than that in X direction under pulsating pressure. The comparison results show that: slight opening changing will greatly affect the changes of stress and deformation parameters when opening is small. For example, when opening is increased from 0.2 to 0.3, the maximum deformation of gate decreases by 49.3%, the maximum equivalent stress decreases by 59.7%, and the maximum pressure of flow field decreases by 55.2% and 54.6% respectively.[Conclusion]It is suggested that the gate should avoid running in small opening degree for a long time. In wet mode, the natural frequency is lower and the vibration order of the whole body is more. Abnormal deformation and stress distribution of the gate at the edge make it more vulnerable to damage.