Numerical simulation of steady state leakage for urban gas pipeline

According to the characteristic that urban gas pipelines are close to buildings, taking the effect of wind speed and building on gas distribution after pipeline leakage into comprehensive consideration, the paper presents an urban gas pipeline leakage model and its grid division, the computational fluid dynamics software is used to make numerical simulation of steady state urban gas pipeline leakage of 3 kinds of urban gas, natural gas, coalbed gas and liquefied petroleum gas, to find out the distribution of the 3 kinds of gas around buildings at the wind speed of 1 m/s and 5 m/s, and leakage time of 5 s, 20 s, 60 s, and 240 s. The results show that the faster the wind is, the stronger the effect of wind on gas blowing downward the wind is, the gas is apt to build up around buildings and narrow streets for a long time, and forms a large dangerous area. The research results can provide theoretical basis to the reasonable planning for urban gas pipeline networks and accident rescue.