摘要
对于底流消能,格栅的布置能够缩短消力池长度,使其更容易适应地形条件的变化。为此,通过FLOW-3D中的掺气模型对圆孔Γ形格栅式消力池内水气两相流进行数值模拟。结果表明,纵向临底掺气浓度沿程递减(由31.3%减小到8.0%),在格栅位置出现明显下降,栅前(^(#)6断面)临底空穴数最小为5.6,格栅附近空穴数均在9.0左右,栅后空穴数远大于9.0;栅前沿轴线方向近底气泡尺寸沿程增大(由0.9 mm增大到8.1 mm),栅后近底板气泡尺寸则沿程减小(由1.6 mm减小到接近0 mm);流速较大区域较小直径的气泡在掺气减蚀中起主要作用,对混凝土固体边界的保护作用明显,包括格栅在内的消力池结构不易发生空蚀破坏。
For underflow energy dissipation,the arrangement of the grille shortens the length of the stilling pool and makes it easier to adapt to changes in terrain conditions.The two-phase flow of water and gas in the round-bore Γ-shaped grille type stilling pool was numerically simulated by the aeration model in FLOW-3D.The results show that the concentration of longitudinal bottoming gas decreased(31.3% →8.0%) along the way,and decreased significantly at the grid position,the minimum number of holes in front of the grid(~#6 section) was 5.6,the number of holes near the grid was about 9.0,and the number of holes behind the grid was much greater than 9.0.The bubble size near the bottom of the grid front axis increases along the course(0.9 mm→8.1 mm),and the bubble size of the near bottom plate after the grid decreases along the way(1.6 mm decreases to close to 0 mm).It can be considered that the bubbles with smaller diameters in large flow velocity areas play a major role in aeration corrosion reduction,which has obvious protective effect on the solid boundary of concrete,and the structure of the stilling pool including the grid is not easy to occur cavitation erosion damage.
作者
葛亚飞
邱勇
何沛山
普进兵
和云秋
GE Ya-fei;QIU Yong;HE Pei-shan;PU Jin-bing;HE Yun-qiu(College of Water Conservancy,Yunnan Agricultural University,Kunming 65020l,China;Baoying Station Management Office of Jiangsu Water Source Co.,Ltd.on the East Line of the South to North Water Diversion Project,Yangzhou 225000,China;Kunming Hongzhao Water Conservancy and Hydropower Engineering Design and Consulting Co.,Ltd.,Kunming 650020,China)
出处
《水电能源科学》
北大核心
2023年第11期99-103,共5页
Water Resources and Power
基金
云南省兴滇英才支持计划(202201788)。
关键词
气泡尺度
湍动强度
掺气减蚀
底流消能
数值模拟
bubble scale
Turbulence intensity
doped corrosion reduction
energy dissipation by bottom flow
nu-merical simulation
作者简介
葛亚飞(1995-),男,硕士研究生,研究方向为工程水力学,E-mail:1726761435@qq.com;通讯作者:邱勇(1971-),男,教授,研究方向为工程水力学,E-mail:13108854817@126.com。
