齿墩长度对齿墩式内消能工水力特性影响的数值分析  

Numerical Analysis of the Influence of Tooth-block Length on Hydraulic Properties of Tooth-block Inner Energy Dissipaters

作　　者：张博杭 李晓娟 王嘉河 郝瑞霞[1] 田淳[1] ZHANG Bo-hang;LI Xiao-juan;WANG Jia-he;HAO Rui-xia;TIAN Chun(College of Water Resources Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi Province,China;Shanxi Jiecheng Mingrun Water Conservancy Engineering Limited Company,Taiyuan 030024,Shanxi Province,China)

机构地区：[1]太原理工大学水利科学与工程学院,山西太原030024 [2]山西杰诚明润水利工程有限公司,山西太原030024

出　　处：《中国农村水利水电》2023年第6期268-273,共6页China Rural Water and Hydropower

基　　金：山西省自然科学基金项目(2013011037-4)。

摘　　要：为了探究齿墩长度对齿墩式内消能工水力特性的影响,使用Fluent软件中的k–ε数学模型进行数值模拟,并和前期物理模型试验的结果进行比对,验证了模型的准确性,进而对7种不同齿墩相对长度(相对长度η为齿墩长度l与管道内直径D之比)的内消能工的中心轴流速、时均压强、过流能力、消能率、紊动能和流场等进行了分析。结果表明不同相对长度齿墩式内消能工中心轴流速分布规律基本一致,除η等于0.1外,各方案中心轴峰值流速出现的位置相同,不随相对长度的变化而变化,均在齿墩进口后0.38D处;齿墩前后壁面时均压强变化较大,存在低压区;齿墩段后侧旋涡区内紊动能较大,且回流区长度随齿墩相对长度增加逐渐减小;在模拟范围内,流量系数随着齿墩相对长度的增加先增加后减小,η在0.2~0.9范围内流量系数较大,消能率的变化规律则相反;η大于0.9时,突缩突扩段旋涡区分离,此后随着齿墩相对长度增加,多余长度对消能的作用仅由沿程水头损失产生,对消能工消能率的贡献不大,可忽略。综合分析,相对长度为0.2~0.9范围内的齿墩长度较优,给齿墩式内消能工的体型优化提供了依据。In order to explore the influence of the length of the toothed piers on the hydraulic characteristics of the tooth-block inner energy dissipaters,the k-εmathematical model in the Fluent simulation software is used to numerically simulate it,and the results obtained from the numerical simulation calculation are compared with the results of the previous physical model test,and the accuracy of the numerical model of the internal energy dissipaters with different lengths of toothed piers is verified and proved.After that,the model is used to analyze and study the hydraulic parameters such as central axis flow velocity,time-average pressure,flow coefficient,energy dissipation rate,turbulent kinetic energy and flow field of 7 kinds of pier-type internal energy dissipaters with different pier relative lengths(The relative lengthηis the ratio of the length l of the toothed piers to the inner diameter D of the simulated pipe).The numerical simulation results show that the distribution law of the central axis flow velocity of the toothed piers type internal energy dissipaters for the schemes with different relative lengths is basically the same.The maximum flow velocity value appears at the same position.The position of the maximum flow velocity value is fixed and does not change with the change of the relative length of the toothed piers.Under different relative lengths,the position appears 0.38D behind the inlet of the toothed piers.The time-averaged pressure of the front wall and the rear wall of the toothed piers changes obviously,and there is a lower pressure area in these two areas.There is a vortex area in the rear area of the toothed piers,and the turbulent kinetic energy value inside the vortex area is relatively high,and the length of the reflow zone on the rear side of the piers gradually decreases with the increase in the relative length of the piers.Within the simulation range of the numerical simulation,the magnitude of the flow coefficient increases first and then decreases with the increase in the relativ

关 键 词：齿墩式内消能工 时均压强 流量系数 消能率 紊动能 

分 类 号：TV134.2[水利工程—水力学及河流动力学]