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针对城市燃气管道分布与建筑物距离较近的特点,综合考虑风速、建筑物对燃气管道泄漏后气体分布情况的影响,建立城市燃气管道泄漏模型并对其进行网格划分,利用计算流体力学软件对天然气、人工煤气和液化石油气3种城市燃气的稳态泄漏过程进行数值模拟,考察风速分别为1 m/s和5 m/s情况下,泄漏时间为5 s、20 s、60 s和240 s时3种燃气在建筑物附近的分布情况。结果表明:风速越大,风对燃气向下风向的输送作用越强;燃气易在建筑物周围和街道峡谷内长时间堆积,形成较大危险区域。研究结果可为合理规划城市燃气管网和事故救援提供理论依据。
Aiming at the characteristics of the city gas pipeline distribution close to buildings, considering the influence of wind speed and buildings on the gas distribution after the gas pipeline leakage, a city gas pipeline leakage model is established and meshed. Using computational fluid dynamics software The steady state leaking process of natural gas, artificial gas and liquefied petroleum gas (LPG) was studied by numerical simulation. When the wind speed was 1 m / s and 5 m / s respectively, the leakage time was 5 s, 20 s, 60 s and 240 s when the distribution of three kinds of gas in the vicinity of the building. The results show that the greater the wind speed is, the stronger the effect of wind on the downwind direction of gas is. The gas is easy to accumulate around the buildings and in the street canyons for a long time and form a large danger zone. The results can provide a theoretical basis for the rational planning of urban gas pipelines and accident rescue.