摘要
为精确预测悬索桥主缆内除湿空气的流动阻力,以深中通道伶仃洋大桥主缆为研究对象,针对钢丝束截面中微米至毫米级尺度下的空气流动特性进行数值研究。考虑到钢丝堆积方式和通气方向的不同,对钢丝六面体堆积水平通气、钢丝六面体堆积垂直通气和钢丝方形堆积水平通气3种物理模型下的空气流动特性进行数值模拟研究,并与经验公式进行对比;分析来流速度、钢丝间距及钢丝排数对钢丝束内空气流动特性的影响。结果表明:钢丝之间空气的流速较大,钢丝六面体堆积垂直通气时,空气流动所受阻力最大;钢丝束进出口单位距离压差随来流速度的增大而增大,且构建钢丝实体模型计算的钢丝束进出口单位距离压差大于采用经验公式计算的结果;钢丝间距越小,空气流经钢丝束时受到的阻力越大,且阻力系数最大值出现在钢丝六面体堆积垂直通气的情况;钢丝排数对截面空气流动特性的影响较小。
In this paper,the main cables of Lingdingyang Bridge of Shenzhen-Zhongshan Link are used as a study case to accurately predict the flowing resistance of dry air injected into the main cables of suspension bridges for dehumidification purposes.The air flowing characteristics at micron to millimeter scales were numerically simulated.Given that there are different steel wire stacking patterns and air flowing directions,the flowing characteristics were studied with three physical models,including the hexahedral stacking of steel wires and horizontal flowing of dry air,hexahedral stacking of steel wires and vertical flowing of dry air and square stacking of steel wires and horizontal flowing of dry air,the results were compared with those gained by empirical equations.The influences of air flowing speed,steel wire spacing and rows of steel wires on the characteristics of air flowing through steel wire bundles were analyzed.It is shown that the air flows fast through steel wires,in the scenario of hexahedral stacking of steel wires and vertical flowing of dry air,the flowing resistance of the air is the strongest.The differential pressure per unit distance(distance between injection and exhaust ports)increases as the air flows faster.The differential pressure per unit distance gained by calculations with the steel wire solid model is greater than that calculated by the empirical equations.The smaller steel wire spacing generates greater resistance to air flow,and the maximum resistant coefficient occurs in the scenario of hexahedral stacking of steel wires and vertical flowing of dry air.The number of steel wire rows has minimal influence on the cross-sectional flowing characteristics of air.
作者
宋神友
陈焕勇
程潜
倪雅
郑章靖
SONG Shen-you;CHEN Huan-yong;CHENG Qian;NI Ya;ZHENG Zhang-jing(Shenzhen-Zhongshan Link Administration Center,Zhongshan 528400,China;CCCC Highway Bridges National Engineering Research Center Co.,Ltd.,Beijing 100035,China;Jiangsu CUMT Dazheng Surface Engineering Technology Co.,Ltd.,Xuzhou 221008,China;School of Low-Carbon Energy and Power Engineering,China University of Mining and Technology,Xuzhou 221116,China)
出处
《桥梁建设》
EI
CSCD
北大核心
2023年第3期25-32,共8页
Bridge Construction
基金
广东省重点领域研发计划项目(2019B111106002)。
关键词
悬索桥
主缆除湿
空气流动特性
多尺度
钢丝束
多孔介质模型
数值模拟
suspension bridge
main cable dehumidification
air flowing characteristics
multi-scale
steel wire bundle
porous medium model
numerical simulation
