中文摘要：

为了研究城门洞断面有压隧洞的流速分布规律,采用流体数值计算方法和雷诺应力模型对城门洞断面有压隧洞水流进行三维数值模拟,分析城门洞断面形式、雷诺数及水力半径等对城门洞断面有压隧洞流速分布的影响。计算结果表明：普通城门洞断面的流速分布比非普通城门洞断面的均匀；断面最大流速出现在0.6H~0.7H处；普通城门洞断面有压隧洞流速分布均匀的条件是系数着为0.25,此时流速分布为对数分布。

英文摘要：

In order to study the velocity distribution pattern of a city gate-shaped section of a pressured tunnel, three-dimensional numerical simulation was conducted of the flow of a city gate-shaped section of a pressured tunnel using the numerical calculation method and Reynolds stress model. The influence of the shape of the tunnel section, Reynolds number, and hydraulic radius on the velocity distribution pattern in the city gate-shaped section of the pressured tunnel are analyzed. The calculation results show that the velocity distribution of an ordinary city gate-shaped section of a pressured tunnel is more uniform than that of a non-ordinary city gate-shaped section of a pressured tunnel, and the position of maximum velocity is 0.6H～0.7H. The condition that makes the velocity distribution of the city gate-shaped section of the pressured tunnel uniform is that ε=0.25, which is when the velocity distribution starts showing logarithmic distribution.