受枢纽布置与地形条件限制,很多鱼道工程都需要设置180°转弯段。前人研究发现180°转弯段容易出现较大的回流区并影响上溯效率,为改善转弯段水流结构,目前常用的做法是沿转弯段边墙增设垂向导板。与以往研究不同,本研究提出了一种在转弯段内增设顺水流方向导鱼隔板的布置方案。采用数值模拟对转弯段水流流场进行计算研究,结果表明隔板布置可以使主流区基本居中,回流区减小,回流区长宽比增加,转弯段内形成不同流速量值的流区,是一种可供借鉴的优化布置方式。
Abstract
Restricted by hub layout and topography, many fish passage projects need to set up 180° turning section. Previous studies have found that the 180° turning section is prone to generate large recirculation area and hence affecting the upstreaming efficiency of fishes. Vertical rectifier plates are commonly used along the side walls of the turning section to improve the flow pattern of the turning section. Different from previous studies, we propose an arrangement scheme of adding a bulkhead along downstream direction to guide fish in the turning section. Numerical simulation of the flow field in the turning section demonstrate that the bulkhead arrangement makes the mainstream area basically centered, the recirculation area reduced, aspect ratio increased, and the flow area with different velocity values in the turning section formed.
关键词
竖缝式鱼道 /
180°转弯段 /
数值模拟 /
水力学特性 /
水流流态
Key words
vertical slot fishway /
180° turning section /
numerical simulation /
hydraulic characteristics;flow pattern
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基金
国家自然科学基金项目(51709152,51679261);国家自然科学基金优秀青年基金项目(51922065);流域水循环模拟与调控国家重点实验室自主研究课题(SKL2020TS04)
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