|本期目录/Table of Contents|

[1]马世海.城区天然气管道泄漏数值模拟与爆炸危害分析[J].中国安全生产科学技术,2011,7(7):26-30.
　MA Shi-hai.Numerical Simulation of Diffusion and Explosion Risk Analysis of Urban Nature Gas leakage[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2011,7(7):26-30.
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城区天然气管道泄漏数值模拟与爆炸危害分析()
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《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]

卷:
7
期数:
2011年7期
页码:
26-30
栏目:
学术论著
出版日期:
2011-07-30

文章信息/Info

Title:
Numerical Simulation of Diffusion and Explosion Risk Analysis of Urban Nature Gas leakage
文章编号:
1673-193X(2011)-07-0026-05
作者:
马世海
中国安全生产科学研究院，北京100012
Author(s):
MA Shi-hai
China Academy of Safety Science and Technology
关键词:
城区天然气管道; 泄漏扩散; 数值模拟; 爆炸危险分析
Keywords:
urban nature gas pipeline;  leakage and dispersion;  numerical simulation;  explosion risk analysis
分类号:
X932
DOI:
-
文献标志码:
A
摘要:
在人口密度为三级和四级的城区内，密集的高建筑物对天然气管道泄漏后的扩散和流场形成产生重要影响。本文以某城市的实际情况为 例，建立多建筑物的空间几何模型，采用kε湍流方程，SIMPLE算法，模拟了在三种不同风流速度、三种不同压力条件下，城区天然气管道泄 漏气体在多建筑物地形中的扩散情况。根据模拟结果，依据天然气的爆炸极限，对模拟结果及其火灾爆炸危害的范围进行了对比分析。结果表 明，CH4气体的泄漏扩散同时受管道压力、风流速度和周围建筑物的影响；同时受当地风速的影响，泄漏气柱在风流作用下会发生偏折，造成阻 挡风流的建筑物内侧危险气体浓度升高，大大增加建筑物周围环境的危险性。研究结果对城区天然气管道的建设具有一定的指导意义。
Abstract:
In the crowded city zones, the serried high buildings will affect the discharging dispersion and flow field of nature gas pipelines greatly. A practical developed city was research as a case in this paper. The cubic geometry model was constructed, and the k-ε turbulent diffusion model and SIMPLE arithmetic were adopted to simulate the turbulent diffusion field of urban nature gas pipeline leakage among buildings. The simulations were carried out with three pipeline inner pressure and ambient wind velocities. Based on the simulation results, the fire and explosion hazardous field of leakage gas were analyzed according to its explosion limits. The analysis results indicate that the turbulent diffusion of CH4 gas is influenced by the pipeline inner pressure, wind velocity and the surrounding buildings. At the same time, the diffusion field is greatly affected by the wind velocity which causes an obvious offset from the vertical axis. This phenomenon will increase the hazardous gas density and the risk level in the side of buildings against the air flow. This is meaningful for the construction of urban flammable pipelines.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期：2011-03-08
更新日期/Last Update: