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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第13卷    第1期    总第70期    2016年1月

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文章编号:1672-7029(2016)01-0117-08
桥梁挡风屏基本单元多孔介质模型数值建模
张成玉12,陈晓丽12,许建林12,梅元贵12

(1.兰州交通大学机电工程学院,甘肃兰州 730070;2.甘肃省轨道交通力学应用工程实验室,甘肃兰州 730070)

摘 要: 基于桥梁挡风屏的基本开孔单元,采用基于有限体积方法的软件数值求解其周围的三维常物性定常不可压缩湍流流动,统计风速变化情况下挡风屏前后缓变流动截面上的压差,得到压差-风速特性曲线和多孔介质模型的黏性阻尼系数、惯性阻尼系数,研究结果表明: 开孔率20%和10%挡风屏的黏性阻尼系数与惯性阻尼系数,随着风速的增大,也随之增加,2种开孔路挡风屏的黏性阻尼系数与惯性阻尼系数范围在9.46~16.58,5.20~9.10;38.94~55.65,67.34~96.2,可为以后相关研究提供基础参考数据。

 

关键字: 挡风屏;多孔介质模型;数值模拟;黏性阻尼系数;惯性阻尼系数

A numerical porous media modeling of the basic polyporous unit of windbreak barriers constructed on bridges
ZHANG Chengyu1,2, CHEN Xiaoli1,2, XU Jianlin1,2, MEI Yuangui1,2

1.School of Mechatronic Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China;
2.Mechanics Application Engineering of Faffic safety on Track in Gansy, Lanzhou 730070, China

Abstract:In order to obtain the viscous resistance and inertial resistance of the windbreak barriers, numerical simulation of basic polyporous unit of them were carried out by using a computational fluid dynamics (CFD) code based on the finite volume method(FVM). The governing equations of three dimensional, steady and incompressible turbulent flow of air with constant thermal properties were solved. The air pressure drop was calculated by picking two sections in slow flow domains. Then the fitting curve of pressure drop serials to velocities were drawn by altering the incoming velocity of air flow and the resistance coefficients of porous baffle were extracted. The research indicate:with the wind increases, the viscous resistance, inertial resistance of the two kinds of windbreak barriers (opening ratio 20%, 10%) will increase accordingly. The viscous resistance and inertial resistance of the two kinds of windbreak barriers range from -9.46~16.58, 5.20~9.10 and 38.94~55.65, 67.34~96.2, respectively. The data can be used in future numerical study related to windbreak barriers.

 

Key words: windbreak barrier;porous media baffle;numerical simulation; viscous resistance;inertial resistance

ISSN 1672-7029
CN 43-1423/U

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