摘要
矩形薄壁堰在堰上起始水流稳定且小流量的情况下,易形成贴壁堰流现象.应用水力学的方法,对矩形薄壁堰贴壁流水力学特性进行了深入的试验研究.通过研究发现:贴壁流的水面曲线与自由流的水面曲线差别很大;贴壁流水头与流量之间存在着稳定的关系,并拟合出了贴壁流的流量公式;贴壁流的过流能力比自由流大;贴壁流的临界水头为H贴临=4.99～5.05 cm.与自由流相同,矩形薄壁堰贴壁流的水力学特性稳定而且规律.
A phenomenon of wall pressing weir flow is easy to occur when the water freely flows through the rectangle thin-wall weir with an initial stable and small flow rate. The experiments on measuring hydraulic characteristics of wall pressing weir flow were carried out with rectangle thin-wall weirs. The results show that the water surface curve of wall pressing weir flow has a great difference with free weir flow, there is a steady relation between the water head of wall pressing flow and the discharge, which can be expressed as a fitting formula, the flow capacity of wall pressing flow is bigger than that of free weir flow, and the critical head of wall pressing flow is from 4.99 cm to 5.05 cm. Similar to the free flow, the hydraulic characteristics of wall pressing weir flow is stable and regular.
出处
《华北水利水电学院学报》
2012年第3期23-26,共4页
North China Institute of Water Conservancy and Hydroelectric Power
基金
山东省高等学校实验技术研究项目
关键词
矩形薄壁堰
贴壁堰流
试验研究
水头
流量
rectangle sharp-crested weir
wall pressing weir flow
experimental research
water head
discharge
