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弧形泄水闸是水利枢纽工程中常见的挡水、泄水建筑物,其在关闭或开启过程中或者局部开启运行时,在水流脉动压力作用下会产生振动,容易引起闸门结构破坏。本文针对边孔闸门与中孔闸门不同的水流边界条件特点,制作了带导流墙与无导流墙两个弧形闸门模型。在实验室内开展了不同库水位、不同闸门开度下的物理模型试验,并对两个模型上大量测点的水流脉动压力数据进行比较分析。试验表明,导流墙的存在对脉动压力主频的影响较小,但对脉动压力均方根值影响较大;在较高库水位下相对开度位于0.2至0.3区间内时,导流墙的存在不但不会改善闸门的受力状况,反而还会导致受力增强。
Arc-shaped sluice is a common water retaining and drainage structures in a water-control project. When closed or opened or partially opened, an arc-shaped sluice can vibrate under fluctuating pressure of water flow and easily cause damage to the sluice structure. In this paper, according to the different flow boundary conditions of the side gate and the middle gate, two arc gate models with and without a flow guide wall are fabricated. In the laboratory, physical model tests of different reservoir water levels and different gate opening degrees were carried out, and comparative analysis was made on the flow pressure fluctuation data of a large number of measuring points on the two models. The experimental results show that the existence of the guide wall has little effect on the fundamental frequency of the pulsating pressure but has a great influence on the rms value of the pulsating pressure. When the relative opening is within the range of 0.2 to 0.3 at the higher reservoir water level, The existence of not only will not improve the force of the gate, but will also result in increased stress.