为了使明流泄洪洞满足设计泄流量和校核泄流量要求,对其结构进行了优化设计,并根据垣曲县境内板涧河河口右岸的小浪底引黄工程泄洪洞实际工程,建立了明流泄洪洞泄流数学模型。计算中引入FLUENT软件中的VOF(Volume of Fluid)模型和Mixture模型进行数值计算,得到了设计和校核水位条件下泄洪洞泄流能力、水深沿程分布、水流空化数以及断面流速和压强及挑距,并将部分计算结果与模型试验结果进行比较分析,结果表明两者吻合较好。因此采用FLUENT软件研究明流龙抬头泄洪洞的水力特性是可行的,为该项软件应用于实际工程提供了理论依据。

In the design of structure of spillway tunnel with free water surface, design discharge and check discharge should be fulfilled. In view of this, we established a numerical flow model for Yellow River diversion project of Xiaolangdi, located at the right bank of Jianhe River in Yuanqu of Shanxi province. On the basis of volume of fluid (VOF) model and Mixture model, we obtained relevant parameters including discharge capacity, distribution of water depth along the direction of water flow, cavitation number, sectional velocity , pressure and ski-jump distance on the conditions of design water level and check water level. The results show that, simulated values are in good agreement with test values; and it is feasible to study hydraulic characteristics of spillway tunnel with free water surface by using Fluent software; finally, the research results can provide theoretical reference for the application of the software in practical projects.