地下综合管廊燃气泄漏数值模拟研究
Numerical simulation study of gas leakage in underground utility tunnel
殷利鹏 1邢志祥 1朱飞昊 1徐慧 1吴洁 1程洋1
作者信息
- 1. 常州大学安全科学与工程学院,江苏常州 213000
- 折叠
摘要
为研究燃气在地下综合管廊内不同几何结构顶部泄漏和扩散情况,通过Ansys Fluent软件建立拱顶、尖顶和平顶3种结构的管廊燃气泄漏数值模拟模型,分析燃气在不同结构管廊内的扩散规律.研究结果表明:管廊结构会影响燃气扩散情况,泄漏后燃气倾向于向管廊顶部积聚;燃气分层与管廊结构相关,其中拱顶结构分层相比尖顶和平顶更稳定;管廊结构会影响燃气扩散速度,其中拱顶结构内扩散速率相对最低,该结构可降低爆炸风险;本文管廊扩散预测模型的最大相对误差为4.57％,该模型能较准确预测燃气泄漏扩散情况.研究结果可为地下管廊的安全性研究提供一定参考.
Abstract
To study the leakage and diffusion of gas at the roof with different geometric structures in the underground utility tunnels,the numerical simulation models of gas leakage in utility tunnel with three types of roof structures,namely arch roof,pointy roof,and flat roof,were established by using Ansys Fluent software,and the diffusion law of gas in these utility tunnels with different structures was analyzed.The results show that the tunnel structure influences diffusion,with gas tending to accu-mulate at the top.Gas stratification is related to the tunnel structure,with the arched structure having:the most stable stratifi-cation.The tunnel structure also affects the diffusion speed of methane,with the lowest diffusion rate observed in the arched roof,thereby reducing the risk of explosion.The established tunnel diffusion prediction model has a maximum relative error of 4.57％,which can accurately predict gas leakage and diffusion.The research results can provide a certain reference for im-proving the safety of underground utility tunnels.
关键词
地下管廊/燃气泄漏/数值模拟/理查森数/通风频率Key words
underground utility tunnel/gas leakage/numerical simulation/Richardson number/ventilation frequency引用本文复制引用
基金项目
国家重点研发计划项目(2021YFC3001203)
国家重点研发计划项目(2022YFB4002803)
国家重点研发计划项目(2022YFB4002804)
江苏省研究生科研与实践创新计划项目(KY-CX22_3112)
出版年
2024
NETL
NSTL
万方数据