Numerical Study Of Natural Gas Releases From Ruptured Pipeline In Complex Terrain Based On Google Earth And GIS

Previous studies on high pressure natural gas pipeline leakage are mainly focused on small holes,and studies on the leakage of ruptured pipeline are very scarce.However,the dispersion process is highly related to the complex terrain around the pipeline.Therefore,it is of great practical significance to study the diffusion process and hazardous area of ruptured natural gas pipeline in real terrain,which is important for risk assessment and emergency repair.In this paper,natural gas discharge rate model,jet model and dispersion model considering the real terrain are established,and for any real terrain,the real terrain is generated by a rapid modeling method.The discharge rate model is validated by the pipeline decompression wave propagation experiment,and it is concluded that the model with PR real gas state equation is better.The 26th Thorney Island gas diffusion field experiment is validated by the concentration field of the dispersion model.It was found that the concentration field of Realizable k-εturbulence model is the best.The wind field model in the dispersion process is validated by symmetrical mountain wind tunnel experiment.Finally,the real terrain modeling technology is introduced into the dispersion process.The proven models are used to study the dispersion process and the hazardous area of natural gas on different real terrains of ruptured pipeline.Quantitative analysis of the hazadous areas of dispersion simulation on different terrains.In addition,the influence of pipeline diameter,pipeline pressure,wind speed and concentration of H₂S on hazardous area of dispersion in real terrain were also analyzed.This study has great practical significance in risk assessment and emergency repair of the failure of natural gas pipeline.