跌坎突扩型消力池脉动压力大涡模拟研究  

Study on Fluctuating Pressure in Stilling Basin With Sudden Lateral Enlargement and Bottom Drop Based on Large Eddy Simulation

作　　者：卢洋亮 尹进步[1] 张曙光 杨钊[1] LU Yangliang;YIN Jinbu;ZHANG Shuguang;YANG Zhao(College of Water Resources and Architectural Engineering,Northwest Agricultural and Forestry University,Yangling 712100,China;State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China)

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100 [2]天津大学水利工程仿真与安全国家重点实验室,天津300072

出　　处：《人民黄河》2022年第2期133-137,共5页Yellow River

基　　金：国家自然科学基金资助项目(51279170)。

摘　　要：针对跌坎突扩型消力池底板脉动压力分布较为复杂等问题,基于FLOW-3D软件,采用大涡模型和tru VOF法,模拟得出消力池底板的时均压强、脉动压强均方根、功率谱密度等时均量和脉动量特性,并将模拟结果与试验结果进行对比分析。结果表明:大涡模型能够较好模拟跌坎突扩型消力池底板的水流脉动压力,消力池内水跃区脉动压力主要受低频大尺度旋涡影响。在此基础上,对跌坎突扩型消力池底板脉动压力分布规律进行定性和定量分析,深入研究发现:脉动压强均方根最大值位于消力池前部与泄槽边墙延长线附近区域,涡体和流速脉动分别为影响底流旋滚区和附壁射流区底部脉动压力分布的主要因素,而冲击区由两者共同导致。In view of the complicated distribution of fluctuating pressure on the stilling basin slab with sudden enlargement and bottom drop,based on FLOW-3 D software,large eddy model and tru VOF method were used to simulate the time-averaged pressure,root-mean-square of fluctuating pressure and power spectral density. The comparison between the simulation results and the experimental results shows that the large eddy model can simulate the water flow fluctuating pressure in stilling basin with sudden lateral enlargement and bottom drop suitably.The maximum value of root-mean-square fluctuating pressure appears in the vicinity of the front of the stilling basin and the extension line of the venting side wall. The distribution of fluctuating pressure at the bottom of underflow swirling zone and the wall-attached jet zone are affected by the vortex and fluctuating velocity,respectively,and the impact zone is caused by both.

关 键 词：突扩跌坎 大涡模拟 旋涡 脉动压强 

分 类 号：TV135.2[水利工程—水力学及河流动力学]