城镇高层建筑区天然气管道泄漏扩散特性. (Chinese)

Leakage and Diffusion Characteristics of Natural Gas Pipelines in Urban High-rise Building Areas. (English)

The layout of urban buildings is concentrated and the height of buildings is ultra-high. Leakage accidents of urban natural gas pipelines caused by third-party construction damage occur frequently, which may cause serious accident hazards in construction areas. Simulation of the diffusion after gas leakage between buildings is necessary. Based on the characteristics of various urban layout forms, fluent was used to simulate the leakage and diffusion of natural gas pipelines under four different building layouts. The gas diffusion characteristics under different architectural layouts were explored, and the danger zone was summarized. The simulation results show that the enclosed layout is the most dangerous layout among the four types of layout. Within the building complex, natural gas diffusion at the near end of the leakage source develops from the bottom up, while natural gas at the far end of the leakage source settles from the top down and accumulates under the influence of vortex. The blocking effect of the building on the diffusion of natural gas leads to the accumulation of natural gas on the windward side of the building wall, and the dangerous area of natural gas appears on the outside wall and the top of the building. This study is of great significance to guide the prevention and reduction of natural gas accidents. [ABSTRACT FROM AUTHOR]

当今城镇建筑布局集中且楼房高度超高, 因第三方施工破坏等造成的城镇天然气管道泄漏事故频发, 在建筑区可能 造成严重的事故危害, 所以模拟天然气泄漏后在建筑群间的扩散行为是很有必要的。 基于城镇建筑布局形式多样的特点, 利 用 Fluent 软件对 4 种不同建筑布局下的天然气管道泄漏扩散进行模拟, 探究了不同建筑布局下的天然气扩散特性、总结危险 区域。 模拟结果表明围合式布局是 4 种布局形式中最危险布局; 建筑群范围内, 距离泄漏源近端天然气扩散自下而上发展, 距 离泄漏源远端天然气受涡旋作用影响自上而下沉降聚集;建筑物对天然气扩散的阻挡作用导致天然气在迎风侧建筑壁面聚 积, 天然气危险区域出现在建筑体外壁及建筑物顶部位置。 该研究对于指导天然气事故预防和减小事故危害有十分重要的 意义。 [ABSTRACT FROM AUTHOR]

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