基于CFD仿真方法的大桥锚室除湿方案研究  

Research on dehumidification scheme of anchorage in bridge with CFD method

作　　者：眭文昊 程向东[1] 石建中[1] 张啸晨 胡颖健 李鹏[2] SUI Wenhao;CHENG Xiangdong;SHI Jianzhong;ZHANG Xiaochen;HU Yingjian;LI Peng(Wuhan Textile University,Wuhan Hubei 430200,China;不详)

机构地区：[1]武汉纺织大学,湖北武汉430200 [2]中交公路规划设计院有限公司,北京100088 [3]镇江蓝舶科技股份有限公司,江苏镇江212016

出　　处：《工业安全与环保》2023年第8期54-58,共5页Industrial Safety and Environmental Protection

摘　　要：锚室是悬索桥的重要构成部分,常位于地下或半地下空间,进入锚室内部的雨水与地下水蒸发到空气中,若锚室除湿风系统布置不善,将使局部空气相对湿度大于40%,加大锚室内部裸露主缆钢丝的锈蚀程度,直接缩短整座大桥的使用寿命。探究了锚室除湿风系统送风口送风角度的改变与锚室内部空气速度场及绝对湿度的关系。首先根据流场运动控制与输运方程描述了锚室内部空间空气与水蒸汽的运动与分布规律,分析了在风量不变的情况下锚室内部的流速场、绝对湿度场,通过不同送风角度的比对分析原方案的情况,对不足之处加以改进。其次,在获得最佳送风角度且不改变总风量的情况下,通过改变顶部与底部送风的风量分配,探究风量分配对锚室绝对湿度的影响。研究表明,当采用顶部与底部送风结合的方式,顶部送风方向与缆束轴线方向平行且顶部送风风量为600 m^(3)/h,底部送风风量为1800 m^(3)/h时除湿效果佳。The anchorage is an important part of the suspension bridge and is often located in an underground or semi-underground space.The rainwater and groundwater entering the anchorage will evaporate into the air.The corrosion degree of the exposed main cable wires inside the large anchorage directly shortens the service life of the entire bridge.This paper explores the relationship between the air supply angle of the air supply port of the dehumidification air sys-tem in the anchorage and air velocity field and absolute humidity inside the anchorage.Firstly,the movement and dis-tribution laws of air and water vapor in the anchorage are described according to the flow field motion control and transport equation.The flow velocity field and absolute humidity field inside the anchorage are analyzed by comparing and analyzing the situation of the original plan through the comparison of different air supply angles,and the deficien-cies are improved.Secondly,under the condition of obtaining the optimal air supply angle without changing the total air flow rate,the influence of air flow rate distribution on the absolute humidity of the anchorage is explored by chan-ging the air flow rate distribution of the top and bottom parts.The research shows that when the combination of top and bottom air supply is adopted,the top air supply direction is parallel to the cable bundle axis direction,the top air supply flow rate is 600 m^(3)/h,and the bottom air supply flow rate is 1800 m^(3)/h,the dehumidification effect is better.

关 键 词：悬索桥除湿 锚室防腐 湿量估算 数值仿真 对比分析 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]