CFD 瞬态模拟楼宇布局对城镇燃气管道泄漏的影响

1. 武汉理工大学能源与动力工程学院;2. 杭州市城乡建设设计院股份有限公司

天然气泄漏;城燃管道;瞬态模拟;组分输运模型;爆炸极限

The application of CFD transient simulation to investigate the influence of building layout on the leakage of city gas pipeline
JIANG Pan1, YANG Junjia2, ZHANG Qiong1, WU Qiang1, WEI Wei1

1. School of Energy and Power Engineering, Wuhan University of Technology; 2. Hangzhou Urban & Rural Construction Design Institute Co. Ltd.

gas leakage, city gas pipeline, transient simulation, component transport model, explosion limit

DOI: 10.6047/j.issn.1000-8241.2019.12.010

备注

为了科学预测平行楼宇间天然气扩散形成的爆炸危险区域的危害范围,建立了天然气泄漏速率随时间变化的函数关系,运用瞬态模拟方法,得到泄漏压力和楼宇布局对爆炸危险区域的影响。模拟结果表明:天然气扩散过程中遇到建筑物会在其背风向形成副扩散中心向四周空间扩散,随着距离地面高度的增加,天然气最大体积分数逐渐降低,且随着泄漏的持续达到稳定值;各种工况下处于上风向的楼宇均处在危险区域,而处于下风向的楼宇其危险是暂时的(楼距小的工况除外);有风时,增大楼距,减小平行楼宇的相对高度,减小管道的运行压力均有利于天然气在两楼之间的扩散。研究结果可为相关规范的制定以及事故的预防提供科学依据。(图6表1,参[21]

In order to scientifically predict the hazard scope of explosive hazard area which is formed by the natural gasdiffusion between parallel buildings, this paper established the functional relation between natural gas leakage rate and time.Then, the influence of leakage pressure and building layout on the explosive hazard area was clarified using the transientsimulation method. The simulation results show that when the natural gas meets a building in the process of diffusion, itwill form a sub-diffusion center in the leeward direction and then diffuse around. With the increase of its height from theground, its maximum volume fraction decreases gradually and reaches a stable value as the leakage continues. The buildingsupwind are dangerous in all operating conditions while the danger of the buildings downwind is temporary (except forsmall building spacing conditions). Under the wind conditions, increasing the building spacing, reducing the relative heightof parallel buildings and lowering the operating pressure of the pipeline are all conducive to the diffusion of natural gasbetween two buildings. The research results can provide the scientific basis for the formulation of relevant regulations andthe prevention of accidents. (6 Figures, 1 Table, 21 References)

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