隧道顶部式太阳能烟囱空腔截面比对通风与火灾排烟性能影响研究  

Effect of Aspect Ratio of Solar Chimney Cavity on Performance of Natural Ventilation and Smoke Exhaustion in Tunnel

作　　者：李程 黄有波 Li Cheng;Huang Youbo(Civil engineering institute,Guangxi vocational&technical institute of industry,Nanning,530001;College of Safety Engineering,Chongqing University of Science and Technology,Chongqing,401331)

机构地区：[1]广西工业职业技术学院建筑工程学院,南宁530001 [2]重庆科技大学安全工程学院应急管理学院,重庆401331

出　　处：《制冷与空调（四川）》2024年第6期753-759,共7页Refrigeration and Air Conditioning

基　　金：重庆市博士“直通车”科研项目(CSTB2022BSXM-JCX0151);重庆市自然科学基金(cstc2021jcyj-msxmX0919);重庆科技大学科研项目(20240354)。

摘　　要：为研究城市浅埋隧道顶部式太阳能烟囱耦合运营通风与事故排烟的性能,采用数值模拟方法,开展不同烟囱空腔截面宽/深比下的通风与火灾烟气流动模拟,分析太阳能烟囱入口体积流量变化规律。设置太阳能辐射强度由400W/m^(2)至1200W/m^(2),烟囱截面积为24m^(2),截面宽/深比由1.5至6,火源热释放速率为3MW、10MW、20MW。研究得出:太阳能辐射强度增加使空腔吸热量上升,导致通风流量更大,通风流量与q^(1/3)呈正相关;太阳能烟囱入口处体积流量与烟囱深度的2/3和烟囱宽度呈线性增加,烟囱空腔宽/深比越大,烟囱入口处的通风体积流量增加,排烟体积流量却更低,烟囱排烟体积流量随Q^(1/3)和hc^(1/2)增加,烟囱宽为12m,空腔间隙为2m时,上游所有烟气被排除,其通风与排烟性能最佳;基于模拟结果,建立了通风与排烟流量修正模型,修正模型预测值与模拟结果吻合较好。可为隧道太阳能烟囱设计与性能优化提供参考。In order to investigate the performance of solar chimney adopted at tunnel under natural ventilation and fire conditions,the numerical code was employed to simulate the airflow and smoke propagation in tunnel with varied ratio of cavity width to cavity gap.The variation law of volumetric flow rate at cavity inlet was analyzed.The solar radiation intensities varied from 400W/m^(2) to 1200W/m^(2).The ratios of cavity width to cavity gap of solar chimney was in range from 1.5 to 6 with same area of 24m^(2).The fire powers of 3MW,10MW,20MW were conducted.Results show that the absorbed heat power in per unit area increased with the solar radiation that induces the higher airflow velocity,and the airflow velocity linearly improves with q^(1/3).The volumetric flow rate at inlet linearly increases with 2/3 power of cavity gap and cavity width.The larger ratio of cavity width to cavity gap enhances the volumetric flow rate but weaken the smoke exhaustion.The smoke exhaustion rate increases with Q^(1/3) and hc^(1/2).The optimum chimney configuration with 12m width and 2m gap can exhaust all smoke from upstream.A modified model is developed for predicting the airflow rate and smoke exhaustion rate through solar chimney that the predictions fits in good agreement with numerical modelling.This study contributes to application of solar chimney in tunnel and guides extraction design.

关 键 词：太阳能烟囱 隧道火灾 新能源 排烟竖井 通风流量 

分 类 号：TU834.1[建筑科学—供热、供燃气、通风及空调工程]