边孔弧形闸门水流脉动压力特性研究

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。

On the Characteristics of Water Flow Fluctuation Pressure of Radial Gate with Side Orifice

Arc drainage sluice is a common water retaining, drainage building in water conservancy project. In its closing or opening process or in partial opening operation, the vibration due to water flow fluctuation pressure may cause gate structure damage. In this paper, aiming at the different water flow boundary conditions, namely, radial gate with side orifice and radial gate with middle orifice, two radial gate models were fabricated including gate with guide wall and gate without guide wall. Physical model experiment under condition of different reservoir water levels and different gate open degrees was carried out, respectively. Comparative analysis of a large number water flow fluctuation pressure data taken from two models was carried out. Results show that the influence of guide wall on principal frequency of fluctuation pressure is not obvious, but its influence on average mean squire root of fluctuation pressure is obvious. Under the condition of higher reservoir water levels and gate open degree is within the range between 0.2 to 0.3, the existence of guide wall not only does not improve gate's stress state, but also leads to higher stress state.