摘要
由于受鱼道进出口位置、场地条件、枢纽布置等因素限制,大部分鱼道工程需要沿线盘折布置转折段、转弯段水池等非常规水池。采用数值模拟的方法,研究了不同转折角度α(0°<α≤90°)的Ⅰ型鱼道转折段水池内的水流结构分布规律。研究表明,当转折角度α=0°~45°范围内时,主流基本居中,水流结构良好。当转折角度α在45°~90°时,出现了主流贴壁并伴有较大尺度回流区的水流结构,并且随着转折角度α增大,主流贴壁程度增大,内侧回流区尺度进一步增大。针对鱼道转折角度α在45°~90°水流结构所出现的问题,提出了增设整流导板并延长转折段水池长度的改进措施,改善了水流流态。研究所得结果为鱼道设计提供参考。
Due to the limitations from the factors of the locations of the entrance and exit,site condition,project layout,etc. of fishway,the unconventional pools for the turning sections with various turning angles are necessary to be arranged along the fishway with twining and turning layouts for most of fishways. The distribution law of the flow structures in the turning section pools of the Type I fishway with various turning angles α of（ 0° α≤90°） are studied herein with the relevant numerical simulation method. The study shows that when the turning angle α is within the range of 0° ~ 45°,the mainstream is basically centered with a better flow structure. When the turning angle α is within the range of 45° ~ 90°,the flow structure of that the mainstream is adherent to the sidewall along with a large-scale backflow region occurs,moreover,along with the increase of the turning angle α,the degree of the adherence of mainstream to the sidewall is increased,while the scale of the inside backflow region is further increased as well. Aiming at the problems from the flow structure of the turning angle α of fishway within the range of 45° ~ 90°,the improvement measures of adding flow guiding plate and extending the length of the turning section pool are proposed,thus the flow pattern is improved. The study result can provide a reference for design of fishway.
出处
《水利水电技术》
CSCD
北大核心
2017年第11期20-25,共6页
Water Resources and Hydropower Engineering
基金
国家自然科学基金项目(51679261)
国家自然科学青年基金项目(51709278)
关键词
竖缝式鱼道
转折段水池
数值模拟
水力学特性
vertical slot fishway
turning section pool
numerical simulation
hydraulic characteristics
