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采用局部正态模型,利用计算机模拟结果作为模型的进出口边界条件,试验研究了天生桥二级水电站调压井事故检修闸门在动水关闭过程中调压井和压力钢管内的水流流态、通气管风速、悬吊闸门的钢索拉力、闸后压力钢管内压力变化特性.试验表明:在下门过程中,压力钢管内的水流流态平稳,压力钢管内压力和通气管内风速的峰值与下门速度成线性关系,钢索拉力与下门速度关系不明显;压力钢管内负压和通气管风速在随时间的变化过程中都出现了双峰现象;与压力钢管内负压峰值出现时刻相比,通气管风速峰值存在一定“延迟”.试验结果为确定事故检修闸门的下门速度提供了依据.
Using local normal model and computer simulation results as the import and export boundary conditions, the water flow pattern in the pressure surge well and the penstock in the surge gate of the Tianshengqiao Ⅱ Hydropower Station was investigated experimentally The wind speed of the trachea, the cable pull force of the suspension gate and the pressure change characteristics of the steel pipe after the sluice are shown in the experiment.The results show that in the process of the next door, the water flow in the steel pipe is steady and the pressure in the steel pipe and the peak value The relationship between the pulling force and the speed of the lower door is not obvious. The negative pressure and the velocity of the ventilation pipe in the pressure pipe both appear the bimodal phenomenon with the change of the time. Compared with the time when the peak value of the negative pressure in the pipe , There is a certain “delay ” in the peak value of the velocity of the ventilation pipe, and the test results provide a basis for determining the speed of the next door of the accident inspection gate.