地下综合管廊天然气管道泄漏气体扩散特性研究  

Leakage gas diffusion characteristics of natural gas pipelines within underground integrated utility tunnels

作　　者：刘保东 廖志华 李明 蒋歆春 温海珍 饶平平[1] LIU Baodong;LIAO Zhihua;LI Ming;JIANG Xinchun;WEN Haizhen;RAO Pingping(School of Environment and Architecture,University of Shanghai for Science and Technology,Shanghai 200093,China;Nanning City Construction and Management Corridor Construction Investment Co.,Ltd.,Nanning 530219,China)

机构地区：[1]上海理工大学环境与建筑学院,上海200093 [2]南宁城建管廊建设投资有限公司,南宁530219

出　　处：《上海理工大学学报》2025年第1期54-60,共7页Journal of University of Shanghai For Science and Technology

基　　金：国家自然科学基金资助项目(42077435,42377171);2022年南宁市科学研究与技术开发计划项目(ZC20223242)。

摘　　要：采用双精度ANSYS Fluent软件构建地下综合管廊天然气管道泄漏的CFD数值模型,结合南宁市新邕路综合管廊的实际参数,设置泄漏、进气与排气等条件,并与实验数据对比验证模型精度。最终定量分析地下管廊内泄漏气体的扩散行为及浓度分布。研究发现,泄漏初期甲烷在泄露点附近迅速形成高浓度区域,并在几秒内向管廊上方显著扩散。随着时间的推移,甲烷浓度逐步在管廊截面上均匀化,尤其在50~300 s范围内,稀释效应更显著,最终在长时间尺度下达到稳定分布。监测数据显示,泄漏口附近监测点浓度上升最快并在25 s后保持稳定,进气口附近的监测点浓度逐渐稳定在约1.5%,排气口附近则低于0.1%。这些结果为定量分析甲烷气体泄漏后的浓度分布、扩散速度及空间扩散范围提供了有效方法,揭示了泄漏初期和长时间气体浓度的变化规律,有助于制定更有效的安全控制措施、优化通风设计及应急响应策略。A computational fluid dynamics(CFD)model for natural gas pipeline leakage in an underground integrated utility tunnel was developed using double-precision ANSYS Fluent,incorporating the actual parameters of the Xinyong Road utility tunnel in Nanning.Leakage,intake,and exhaust conditions were configured,and the model's accuracy was validated by comparing it with experimental data.Quantitative analysis of gas diffusion behavior and concentration distribution was conducted,revealing that initially methane forms a high-concentration zone near the leakage point,with rapid upward diffusion in the tunnel within seconds.Over time,methane concentration becomes more uniform across the tunnel cross-section,with a noticeable dilution effect from 50 to 300 seconds,eventually achieving a steady distribution on a longer timescale.Monitoring data indicated that the highest concentration rise near the leak,stabilizing after 25 seconds,with intake points stabilizing around 1.5%and exhaust points below 0.1%.These findings provide quantitative insights into methane concentration distribution,diffusion rate,and spatial spread following leakage,highlighting the patterns of initial and long-term gas concentration change.This study supports the development of effective safety controls,optimized ventilation designs,and emergency response strategies.

关 键 词：地下综合管廊 天然气 泄漏 扩散 数值模拟 

分 类 号：TU990.3[建筑科学—市政工程]