本文用有限元法及实验方法研究了溢流槽在小水头(小于30mm)情况下溢流的流体运动规律。针对国内外现行的设计计算方法提出若干新的概念。根据实验结果,将溢流槽的溢流划分为四个流动规律不同的区域,通过分析得出稳定区是溢流槽最适宜的工作区域。文中还推导出溢流槽流量系数C_d的公式,其计算值与实验值的相对标准偏差为1%。 In this paper, the finite element method and the experimental method were used to study the fluid movement of the overflow tank under the condition of small head (less than 30mm). A number of new concepts are proposed according to the current design and calculation methods at home and abroad. According to the experimental results, the overflow of the overflow tank is divided into four areas with different flow patterns. The analysis shows that the stable area is the most suitable working area for the overflow tank. The formula of the overflow flow coefficient C_d is also deduced in this paper. The relative standard deviation between calculated and experimental values ​​is 1%.