水电站工作闸门动水关闭数值模拟分析

结合某水电站的实际资料建立了由水库、引流道、工作闸门和蜗壳组成的三维模型,运用数值模拟软件对实际工况和设计工况进行计算对比.计算结果表明闸门在两个剪断销剪断时无法关闭的原因是滑块的老化导致摩擦系数增大.由于闸门底部的特殊型式闸门在正常下落过程中底缘所受压力分布不均匀,且随着开度的减小底部不均匀程度有所增加,导致闸门关闭过程中的垂直振动,机组强烈震动弃负荷时将飞逸,对系统和人员的安全带来重大隐患.本文对电站的安全生产和闸门的优化设计有一定参考价值.

Numerical simulation about fast gate hydrodynamic closing of hydropower

Based on the actual data in a hydropower station, a three-dimensional model was established, which was composed of reservoir, flow channel, working gate and volute. The actual working conditions and design conditions were compared by the calculation of numerical simulation software. The calculation results show that the reason why the gate can not be closed with the shearing off of the two shear pin is the increase of its friction coefficient resulting from the aging slider. Because of its special type, the bottom edge of the gate bears pressure of inhomogeneous distribution when falling down normally. Besides, with the reduction of the opening scope, the unevenness degree will be increased, which may result in the vertical vibration when closing. After that, the strong vibration in the cause of abandoning load may lead to unit of running away, which may pose significant security risks for the system and staff. This paper has a certain reference value for the daily running of the power station and the optimization design of the gate.