半封闭空间单侧冷风幕效应数值模拟研究  

Research on Numerical Simulation of One-side Cold Air Curtain Effect in Semi-enclosed Space

作　　者：王青松 任少强[1] 王平安[1] 谢江胜[1] 周扬 杨立燃 WANG Qingsong;REN Shaoqiang;WANG Ping’an;XIE Jiangsheng;ZHOU Yang;YANG Liran(China Railway Construction Plateau Tunnel Construction Technology and Equipment R&D Center,China Railway 20 Bureau Group Corporation,Xi’an Shaanxi 710016,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou Jiangsu 221116,China)

机构地区：[1]中铁二十局集团有限公司中国铁建高原隧道施工技术及装备研发中心,陕西西安710016 [2]中国矿业大学力学与土木工程学院,江苏徐州221116

出　　处：《中国铁路》2024年第1期48-56,共9页China Railway

基　　金：中国铁建股份有限公司科研项目(2021-B11);国家自然科学基金项目(51204164);中铁二十局集团有限公司科研计划项目(YF2100SD10B)。

摘　　要：受外部冷空气影响,寒区隧道冻害问题日益严重,为阻止外部冷空气流入隧道,提出以外部空气为空气源的冷风幕隔冷方式,并开展半封闭空间单侧设置冷风幕阻隔外部冷空气流动换热过程的数值模拟研究。数值模拟模型设置参考相关室内试验,通过室内试验测试数据对数值模型进行验证后,利用数值模型研究风幕射流角度、射流速度、射流宽度对热压作用下冷风流入半封闭空间阻隔效果的影响。结果表明:射流角度为3°时,形成风幕形态较理想,半封闭空间平均温度较无风幕作用时有4~5℃的提高,此时增加风幕速度或宽度均会强化外部冷空气与半封闭空间内空气的换热,减弱风幕隔冷效果;射流角度为6°或9°时,风幕射流宽度需要与射流速度匹配,否则易出现风幕形态不理想,导致风幕隔冷失效。The paper proposes the insulation approach of cold air curtain where external air is used as the air source.The goal is to prevent the influx of cold air into the tunnel and to minimize the frost heaving induced in cold areas.Therefore,the paper carries out the numerical simulation of the heat exchange between both sides of the cold air curtain set at one side of the semi-enclosed space.The simulation model is established in reference to the relevant laboratory tests,the data of which then verifies the model in return.The model helps study the influence of air curtain jet angle,jet velocity and jet width on the blocking effect of cold air flowing into semienclosed space under thermal pressure.The results show that when the jet angle is 3°,the shape of the air curtain is favorable,and the average temperature in the semi-enclosed space is 4-5°C higher than that without air curtain.At this point,the increase of the speed or width of the curtain will strengthen the heat exchange,and weaken the cold insulation effect.When the jet angle is 6° or 9°,the width of the curtain needs to match the corresponding speed,otherwise it is prone to cause unsatisfactory shape of the curtain,resulting in cold insulation failure.

关 键 词：寒区隧道 冻害 半封闭空间 冷风幕 数值模拟 

分 类 号：U456[建筑科学—桥梁与隧道工程]