弧形闸门前旋涡临界淹没水深研究

该文以某弧形闸门控制的泄洪闸为研究对象,采用比尺为1:20的水工模型试验,对弧形闸门前的旋涡特性及其临界淹没水深进行了研究。试验观测发现,弧形闸门局部开启时,闸门前旋涡总是成对出现的,且环量方向相反。实测吸气旋涡的临界淹没水深数据表明,其不仅与弗劳德数有关,还与进水口的宽高比以及来流收缩比有关。最后该文通过理论分析和数据拟合的方法,建立了避免弧形闸门前形成吸气旋涡的临界淹没水深公式,该公式同时考虑了弗劳德数、闸门开度和来流环量的影响。

Study on the critical submergence of vortex before radial gate

In this paper,the characteristics and critical submergence of vortex before radial gate are studied by the 1∶20 scale model experiment of a sluice which controlled by the radial gate.Experimental observation are found that the vortexes formation before the partial opened gate are always in pair and they have opposite circulation direction.The experiment data show that the critical submergence is not only related to the Froude number,but also related to the intake aspect ratio and upper stream contraction ratio.Finally,using theoretical analysis and data fitting methods,a critical submergence formula which avoiding air-core vortices before radial gate is established in this paper.It has considered the effects of Froude number,gate opening and circulation.