超长水下公路隧道侧向重点排烟系统合理排烟量分析  

Analysis of Reasonable Smoke Discharge Capacity of Lateral Key Smoke Exhaust System in Ultra-long Underwater Highway Tunnel

作　　者：张宇 Zhang Yu(China Railway Fifth Survey and Design Institute Group Co.,Ltd,Beijing,102600)

机构地区：[1]中铁第五勘察设计院集团有限公司,北京102600

出　　处：《制冷与空调（四川）》2022年第1期61-66,共6页Refrigeration and Air Conditioning

基　　金：中国铁建股份有限公司科技研究开发计划项目(2019-B20)。

摘　　要：苏州某水下公路隧道全长9km,最大断面面积约142m2,其距离长、断面大的特点对隧道排烟系统的合理性设计提出了更高的要求,而排烟量的合理性是隧道排烟系统合理化设计的前提。为此,先采用理论公式进行计算,后采用FDS数值模拟的方法研究了隧道侧向重点排烟系统在火灾荷载为50MW,排烟量分别为220m3/s、240m3/s、260m3/s时的烟气蔓延范围、排烟阀处温度、流速、排烟效率的变化规律。结果表明:超长水下公路侧向排烟系统在50MW火灾下,不同排烟量时排烟阀排烟效率、烟气蔓延范围均无显著差异,且排烟阀处温度、流速均在要求范围内;理论计算与数值模拟均表明合理排烟量的计算值为220m3/s,设计值为260m3/s。研究结果可为水下长隧道侧向重点排烟系统排烟量的理论计算提供方案参考。The length of an underwater highway tunnel in Suzhou is 9 km, and the maximum cross-section area of the tunnel is about 142 m2. The characteristics of long distance and large cross-section put forward higher requirements for the rational design of the tunnel smoke exhaust system, and the rationality of the smoke exhaust is the premise of the rational design of the tunnel smoke exhaust system. Therefore, this paper first used theoretical formula for calculation, and then used FDS numerical simulation method to study the change law of smoke spread range, the temperature of smoke exhaust valve, flow rate at the smoke exhaust and smoke exhaust efficiency of the tunnel lateral key smoke exhaust system when the fire load was 50 MW and the smoke exhaust volume were 220 m3/s, 240 m3/s and 260 m3/s, respectively. The resulted show that there was no significant difference in smoke efficiency and smoke spread range of the exhaust valve under the condition of 50 MW fire of the ultra-long underwater highway side smoke exhaust system under different theoretical smoke volume, and the temperature and flow rate at the exhaust valve were within the required range. Both theoretical calculation and numerical simulation showed that The theoretical value of the reasonable exhaust volume was 220 m3/s and the design value was 260 m3/s. Further, it would provide a scheme reference for the theoretical calculation of the smoke output of the lateral key smoke exhaust system of the underwater long tunnel.

关 键 词：超长水下隧道 侧向重点排烟系统 合理排烟量 FDS数值模拟 

分 类 号：U458.1[建筑科学—桥梁与隧道工程]