中低雷诺数下拦污栅结构动态绕流数值模拟  

NUMERICAL SIMULATION OF THE FLOW CHARACTERISTICS AROUND A TRASH RACK AT LOW AND MEDIUM REYNOLDS NUMBER

作　　者：杨家富 骆佳玲 王文全 YANG Jia-fu;LUO Jia-ling;WANG Wen-quan(State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu,Sichuan 610065,China)

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室,四川,成都610065

出　　处：《工程力学》2025年第4期265-272,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(52179087)。

摘　　要：拦污栅下游闸门在动态启闭过程中,拦污栅将在不同流动雷诺数下工作,其水动力动态特性备受关注。为此,基于高时空分辨率的Incompact3d开源软件构架,采用浸入边界法处理复杂流固边界,研究了拦污栅在中低流动雷诺数下(Re≤3900)的水动力特性。结果表明:在中低流动雷诺数下,拦污栅的水动力特性与前缘涡脱落和尾迹涡的生成紧密相关,升、阻力系数都呈现周期性变化趋势。随着雷诺数增大,拦污栅时间平均阻力系数呈现逐渐降低的趋势,但升、阻力系数的频率逐渐增加。同时发现在Re≤3900时,随着栅条间距的减小,拦污栅时间平均阻力系数呈现逐渐升高的趋势,但升、阻力系数的频率逐渐降低。During the opening or closing of the downstream gate of trash rack,the trash rack will work at different flow Reynolds numbers,and its hydrodynamic characteristics are of great interest to researchers.To this end,the hydrodynamic characteristics of the trash rack at low and medium flow Reynolds numbers(Re≤3900)are investigated in detail.The Incompact3d open-source software framework with a high spatial and temporal resolution is used to solve the flow,and the fluid-solid boundary is dealt with using the immersed boundary method.The results show that the hydrodynamic characteristics of the trash rack at low and medium flow Reynolds numbers are closely related to the shedding of the leading-edge vortex and the generation of the trailing vortex,and the lift and drag coefficients show a periodic trend.As the Reynolds number increases,the timeaveraged drag coefficient shows a trend of gradually decreasing,but the frequency of the drag and lift coefficient gradually increases.It is also found that the time-averaged drag coefficient shows a trend of gradually increase with the decrease of the fence spacing at Re≤3900,although the frequency of the drag and lift coefficient decreases gradually.

关 键 词：拦污栅 水动力特性 涡量分布 数值模拟 高保真 

分 类 号：TV732.2[水利工程—水利水电工程]