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


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



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)