Abstract: The three dimensional model of the pipe leakage in the open ground was established and the grid refinement was made to aim at the highspeed leak areas. Using CFD commercial software FLUENT 6.3 for gas pipeline leakage process was simulated. The different wind speed, the influence of the initial velocity and leak mouth shapes (round and diamond) under the condition of leak were examined. The numerical simulation results showed that the wind speed had a great influence on jet angle on gas leak. The diffusion range increased with the diffusion height. The initial velocity had a great influence on jet height. The diffusion height increased with the initial velocity increasing. The wider range of hydrogen sulfide leak was circle leak mouth. The simulation results had certain significance for long distance natural gas pipeline leakage diffusion laws awareness and accident prevention.

Key words: Natural gas, Pipeline, Leak, Diffusion, Threedimensional numerical simulation

摘要： 摘 要:  建立了天然气管道在空旷地面发生泄漏的三维模型, 对高速泄漏区域进行了网格细化。利用C F D商
业软件F LUENT6. 3对泄漏过程进行模拟, 考察了大气风速、 泄漏初速度和泄漏口形状( 圆形和菱形) 对泄漏的影
响。模拟结果表明, 风速对天然气泄漏喷射射流角度有较大影响, 扩散范围随扩散高度而增大; 泄漏初速度对天然
气喷射高度有较大影响, 扩散高度随泄漏初速度的加快而变高; 圆形泄漏口的硫化氢泄漏范围最宽。研究结果对加
深长输天然气管道泄漏扩散规律的认识、 事故的预防具有一定的意义。

关键词: 天然气, 管道, 泄漏, 扩散, 三维数值模拟