主线坡度对分岔隧道主线隧道内顶棚温度分布的影响  

Influence of mainline slope on ceiling temperature distribution in mainline tunnel of bifurcated tunnel

作　　者：刘茜 汪彬 李程 黄有波 董炳燕 Liu Xi;Wang Bin;Li Cheng;Huang Youbo;Dong Bingyan(School of Safety Science and Engineering,Chongqing University of Science and Technology,Chongqing 401331,China;Guangxi Vocational&Technical Institute of Industry,Guangxi Nanning 530001,China;State Key Laboratory of Fire Science,University of Science and Technology of China,Anhui Hefei 230026,China)

机构地区：[1]重庆科技大学安全科学与工程学院,重庆401331 [2]广西工业职业技术学院,广西南宁530001 [3]中国科学技术大学火灾科学国家重点实验室,安徽合肥230026

出　　处：《消防科学与技术》2024年第9期1303-1308,共6页Fire Science and Technology

基　　金：国家自然科学基金(52104185);重庆市自然科学基金(cstc2021jcyj-msxmX0919);火灾科学国家重点实验室开放基金(HZ2023-KF07);重庆科技大学研究生创新计划项目(YKJCX2220703、YKJCX2220702);重庆科技大学科研项目(20240354)。

摘　　要：为研究主线坡度对分岔隧道主线隧道内火灾烟气蔓延的影响,采用数值模拟,分析分岔前主线不同坡度与火源功率下隧道内的温度分布,提出考虑主线坡度和火源功率的隧道顶棚最高温升预测模型和主线隧道下游温度纵向衰减模型。结果表明:给定热释放速率下,随主线坡度增加,隧道内最高温升逐渐降低;主线隧道坡度越大,火羽流向主线隧道下游倾斜越明显,顶棚下最高温度位置向下游偏移;主线隧道下游烟气层厚度随隧道坡度增加而减小,主线隧道下游纵向温升也随之降低。In order to study the influence of mainline slope on fire smoke spread in mainline tunnel of bifurcated tunnel,the numeri-cal simulation method was used to analyze the temperature distri-bution in tunnel under different mainline slope and fire source power of the mainline before the bifurcation.A maximum tem-perature rise prediction model of tunnel ceiling and a longitudinal temperature rise attenuation prediction model of downstream mainline tunnel were proposed considering mainline slope and fire source power.The results show that under the given heat release rate,the maximum temperature rise in the tunnel decreases with the increase of the mainline slope.The larger the slope of the main tunnel,the more obvious the inclination of the plume flow downstream of the main tunnel,and the maximum temperature under the ceiling shifted downstream.The thickness of the smoke layer in the downstream of the main tunnel decreases with the in-crease of the tunnel slope,and the longitudinal temperature rise in the downstream of the main tunnel also decreases.

关 键 词：分岔隧道 最高温度 纵向温升 隧道火灾 

分 类 号：X932[环境科学与工程—安全科学] X951