Abstract: The upstream guide wall of flood discharge gate plays the role of restricting and guiding flow, improving the inlet boundary conditions, adjusting the flow pattern, and ensuring the safe operation of hydraulic structures. This paper, taking a proposed hydropower station on Dadu river as the research object, presents the numerical simulation used to study pier head of three shapes: respectively circular, streamlined, and square. The research results show that the backwater effect of the streamlined pier head is better than that of the circular pier head and the square pier head. The length of the detour flow zone around the streamlined pier head is 33.5%smaller than the circular pier head and is 62.3% smaller than the square pier head. The root mean square of the diversion ratio of the streamlined pier head is smaller than that of the square and circular pier heads, and the discharge capacity of the gate hole is more uniform. The relevant research results can provide guide for sluice design.

Key words: numerical simulation, upstream guide wall, pier head shape, hydraulic indicators, detour flow, flow field

摘要： 泄洪闸上游导墙具有约束引导水流、改善进水口边界条件、调整水流流态、保证水工建筑物安全运行等重要作用，而山区河流行进流速较大，上游导墙墩头形状尤为重要。以大渡河某拟建河床式水电站为研究对象，采用数值模拟对圆形墩头、流线形墩头和方墩头三种墩头体型进行了深入研究，研究成果表明流线形墩头的减阻效应优于圆形墩头和方形墩头；流线形墩头的绕流区长度较圆形墩头和方形墩头的绕流区长度分别小 33.5%和62.3%；流线形墩头分流比的均方根相对小于方形墩头与圆形墩头，且闸孔的泄流能力更均匀。相关研究成果可供水闸设计参考。

关键词: 数值模拟, 上游导墙, 墩头体型, 水力学指标, 绕流, 流场