步长对台阶式溢洪道消能特性的影响  

Study on Influence of Step Length on Energy Dissipation of Stepped Spillway

作　　者：武英豪 李继伟 WU Ying-hao;LI Ji-wei(Yellow River Engineering Consulting Co.,Ltd.,Zhengzhou 450003,China;Key Laboratory of Water Management and Water Security for Yellow River Basin,Ministry of Water Resources(Under Construction),Zhengzhou 450003,China)

机构地区：[1]黄河勘测规划设计研究院有限公司,河南郑州450003 [2]水利部黄河流域水治理与水安全重点实验室(筹),河南郑州450003

出　　处：《水电能源科学》2024年第8期92-96,共5页Water Resources and Power

摘　　要：为明确步长对台阶式溢洪道消能特性的影响,采用计算流体力学方法,利用Flow 3D软件对台阶式溢洪道上的水汽二相流进行数值模拟,在固定台阶高度1 m不变的前提下,系统研究了步长长度对台阶消能的影响。结果表明,步长和台阶高度直接决定回旋涡流区的尺寸,而涡流区尺寸与消能率呈正相关,步长(溢洪道坡度)与台阶高度一致,均是决定台阶消能效果的关键因素;台阶高度不变时,步长越长则涡流区尺寸越大,溢洪道的消能率越高,但当两者之比为1∶2.2时,此台阶高度对应的涡流区尺寸已接近极限,采用此坡比的台阶可妥善兼顾溢洪道的经济性和消能效果。Based on computational fluid dynamics(CFD)method,software Flow 3D is used to numerically simulate the two-phase flow on stepped spillways to clarify the influence of step length on the energy dissipation characteristics of stepped spillways.With a fixed step height 1 m,the impact of step length on energy dissipation of stepped spillways is systematically studied.The results show that the step height and step length directly determine the size of the swirling vortex area,which is the key factor in determining the energy dissipation rate of the stepped spillway.With a fixed step height,the longer the step length is,the larger the size of the swirling vortex area is,and the higher the energy tion dissipa-rate of the stepped spillway is.However,when the step length increases to a slope ratio of 1∶2.2,the size of the swirling vortex area corresponding to this step height is approaching the maximum,resulting in that stepped spillway with a slope ratio of 1∶2.2 can properly balance the economy and energy dissipation.

关 键 词：台阶式溢洪道 台阶步长 回旋涡流 消能率 数值模拟 

分 类 号：TV651.1[水利工程—水利水电工程] TV135.2