DOI: 10.36347/sjet

Pages: 142-147

The leakage of natural gas pipeline brings threat to people’s safety and social stability. Gas diffusion plays an important role in detecting pipeline leakage. Diffusion model of overhead natural gas pipeline leakage was established, and diffusion process was analyzed numerically with different leakage locations and different leakage velocities. The results show that the diffusion concentration of natural gas on the ground is high when the leaking location is on the bottom. However, the diffusion concentration of natural gas on the ground is low when the leaking location is on the top. Distribution of natural gas concentration is conical when pipeline is leaking at high speed. When pipeline is leaking at medium speed, there are great differences of natural gas concentration in different heights of vertical direction. Natural gas diffusion concentration is smaller when pipeline is leaking at low speed, and there is obvious backflow around the jet beam.