悬索桥主缆内除湿过程流动传质特性研究  

Study on Flow and Mass Transfer Characteristics of Dehumidification Process in the Suspension Bridge Main Cable

作　　者：何琛 徐阳[1] 尹航 郑章靖 HE Chen;XU Yang;YIN Hang;ZHENG Zhangjing(School of Low-Carbon Energy and Power Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学低碳能源与动力工程学院,徐州221116

出　　处：《工程热物理学报》2025年第4期1301-1309,共9页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.52176215);中国矿业大学研究生创新计划项目(No.2023WLJCRCZL216)。

摘　　要：主动除湿技术可以有效解决悬索桥主缆内部的钢丝腐蚀问题。当采用数值模拟方法研究主缆除湿过程时,由于主缆内钢丝数量众多,钢丝实体结构难以画出,本文提出了多孔介质流动-传质模型。考虑了松散态与紧束态两种不同的堆积状态,并考虑液态水与水蒸气之间的相转换,分析了主缆内是否含有液态水以及流速对除湿过程的影响。结果表明:主缆截面速度分布呈现出非均匀现象,松散区的平均速度与紧束区平均速度相差64.8%。当考虑主缆内存在液态水时,所用模型更好地还原了除湿过程,与未添加液态水模型相比,两者除湿时间相差95.82%。另外,除湿时间随着湿空气流速的增大而减少,主缆内空气流速为0.139 m·s^(−1)比0.125 m·s^(−1)除湿完成时间缩短32.5%,阻力增加47.45%。Active dehumidification technology can effectively solve the problem of steel wire corro-sion inside the main cables of suspension bridges.When numerical simulation is used to study the dehumidification process of the main cable,the actual structure is difficult to establish due to the number of steel wires in the main cable,so a porous media flow-mass transfer model is proposed in this study.This model considers both loose and tightly bound states with two different stacking states and the phase transition between liquid water and water vapor.Moreover,the effects of the presence of liquid water in the main cable and the velocity on the dehumidification process are ana-lyzed.The results show that the velocity distribution of the main cable cross-section demonstrates a non-uniform phenomenon.The difference between the average velocity in the loose area and the tightly bound area is 64.8%.The dehumidification process is better restored when considering the presence of liquid water inside the main cable.Compared to the model without adding liquid water,the difference in dehumidification time between the two is 95.82%.In addition,the dehumidification time decreases with the increase of wet air velocity.With the air velocity of 0.139 m·s^(−1)in the main cable,the dehumidification completion time is reduced by 32.5%compared to 0.125 m·s^(−1),but the resistance increases by 47.45%.

关 键 词：悬索桥主缆 除湿 流动传质 多孔介质模型 

分 类 号：U488.25[交通运输工程—载运工具运用工程]