城镇地埋天然气管道泄漏诱发气云爆炸仿真

In order to explore overpressure and temperature characteristics of explosion flow field after gas leakage of buried natural gas pipelines, FLACS was used to simulate leakage and explosion accidents of pipelines. Then, development characteristics of these accidents were studied from three aspects, environmental wind speed, leak rate, and leakage aperture. The results show that under a condition of continuous and stable leakage, flammable gas's coverage area will be stable. Wind speed, leakage aperture and leak rate influences buoyancy dispersion stage, jet nucleus, and initial momentum respectively, thus influencing gas dispersion. When an accident happens, explosion flame mainly propagates upward, and the overpressure it generates is comparatively small, but the temperature is high. Under windless condition, when leakage aperture is 0.3 m, leak rate at 4 kg/s, overpressure of gas cloud explosion generated by leakage is 0.46 kPa, while high temperature generated reaches as high as 2 135.7 K.