街道天然气管道泄漏扩散的数值模拟分析  

Numerical Simulation Analysis of Leakage and Diffusion of Street Natural Gas Pipeline

作　　者：黄小美[1] 张婧 周阳[1] 张琼雅 

机构地区：[1]重庆大学三峡库区生态环境教育部重点实验室,重庆400045 [2]青岛能源华润燃气有限公司,山东青岛266000 [3]南京燃气工程设计研究院,江苏南京210000

出　　处：《煤气与热力》2016年第2期32-38,共7页Gas & Heat

基　　金：国家自然科学基金资助项目(50908244)

摘　　要：为分析泄漏时间、管道压力、泄漏孔径以及泄漏口与建筑物距离四个因素对典型街道天然气管道泄漏扩散的影响,采用数值模拟方法建立CFD模型对天然气管道泄漏扩散进行模拟,得到不同影响因素下的甲烷体积分数分布。利用相似性原理建立缩小比例实验模型实测,进行实验验证,比较4个观测点的射流速度的测试结果与模拟结果,验证结果表明模拟方法具有较好的准确性。研究表明,泄漏扩散初期体积分数分布变化很大;泄漏一段时间后,建筑物对扩散的天然气起抬升作用,使射流高度增加,泄漏天然气对旁边的建筑物有贴附效应。To analyze the influences four factors including leakage time, pipeline pressure, leakage aperture and distance between leakage point and build- ings on leakage and diffusion of typical street natural gas pipeline, a CFD model is established using the nu- merical simulation method to simulate gas pipeline leakage and diffusion, and the methane concentration distribution at the different factors is obtained. At the same time, an experimental model for actual measure- ment is established using the similarity principle. Through comparison between the experimental data and the simulation data of jet velocity at four observationpoints, the high accuracy of CFD numerical simulation is demonstrated. Research shows that the concentration distribution changes significantly at the beginning of the leakage and diffusion. After a period of time, buildings lift the diffused natural gas and increase the jet height, and leakage of natural gas has an attached effect on lat- eral buildings.

关 键 词：天然气管道 泄漏扩散 数值模拟 浓度场 射流速度 实验验证 

分 类 号：TU996.6[建筑科学—供热、供燃气、通风及空调工程]