梯形墩-悬栅消力池水力特性数值模拟  

Numerical simulation on hydraulic characteristics of trapezoidal pier-suspended grid stilling basin

作　　者：俞晓伟 牧振伟[1,2] 高尚 YU Xiaowei;MU Zhenwei;GAO Shang(College of Hydraulic and Civil Engineering,Xinjiang Agricultural University,Urumqi,Xinjiang 830052,China;Xinjiang Key Laboratory of Hydraulic Engineering Security and Water Disasters Prevention,Urumqi,Xinjiang 830052,China)

机构地区：[1]新疆农业大学水利与土木工程学院,新疆乌鲁木齐830052 [2]新疆水利工程安全与水灾害防治重点实验室,新疆乌鲁木齐830052

出　　处：《排灌机械工程学报》2025年第1期66-73,共8页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(52269019)。

摘　　要：针对低弗劳德数水跃消能问题,以消力池内布置的梯形墩-悬栅联合消能工为研究对象,采用RNG k-ε湍流模型和VOF法进行数值模拟,研究消力池内水力特性和消能效果.结果表明:梯形墩可有效降低消力池底板压强和入池临底流速,墩后压强低于100 Pa,流速降至0.20 m/s时,随着Fr增大,压强和流速分布改善效果越显著;消力池内涡量强度最大值位于陡坡段水跃旋滚区,该区域存在明显涡核,为能量耗散主要区域,梯形墩和悬栅区域涡结构间断分布,属于弱涡结构,能量部分耗散;梯形墩-悬栅联合消力池中能量耗散主要由水跃能量耗散、梯形墩剪切耗散和悬栅沿程耗散组成,3种工况下消能率较传统消力池分别提升4.49%,9.74%,9.79%,充分发挥出联合消能工叠加消能的效果,研究结果可为类似工程消能工设计研究提供一定的参考.With the trapezoidal pier-suspended grid combined energy dissipator situated in the stilling basin as the research object,the RNG k-εturbulence model and VOF method were used for numerical simulation to study the hydraulic characteristics and energy dissipation effect of the trapezoidal pier-suspended grid stilling basin.This was done in order to address the issue of hydraulic jump energy dissipation with low Froude number.The results show that the trapezoidal pier can effectively reduce the floor pressure and the velocity near the bottom of the stilling basin.The pressure behind the pier is lower than 100 Pa,and the velocity decreases to 0.20 m/s.As Fr increases,the effect of improving pressure and velocity distribution becomes more significant.The maximum vorticity magnitude in the stilling basin is located in the hydraulic jump and rolling area on the steep slope,where there is an obvious vortex core,which is the main area of energy dissipation.The vortex structure in the trapezoidal pier and suspended grid area is discontinuous,which belongs to the weak vortex structure and the energy is partially dissipated.The energy dissipation in the trapezoidal pier-suspended grid stilling basin is mainly composed of three parts:hydraulic jump energy dissipation,trapezoidal pier shear dissipation and suspension grid dissipation,and the energy dissipation rate of the three working conditions is increased by 4.49%,9.74%and 9.79%respectively compared with the traditional stilling basin,which gives full play to the effect of superimposed energy dissipation of joint energy dissipators.The results can provide reference for the design and research of energy dissipators in similar projects.

关 键 词：低弗劳德数水跃 梯形墩-悬栅 数值计算 水力特性 能量耗散 

分 类 号：S277.9[农业科学—农业水土工程]