高原城市中压天然气管道泄漏扩散的数值模拟

The Numerical Simulation of the Medium Pressure Gas Pipeline Leakage in Plateau City Zones

针对高原城市中压天然气管道泄漏情况,研究了多层、高层建筑物和风速对天然气管道泄漏和扩散的影响,利用CFD模拟计算软件分别对高原气压下中压A、中压B天然气管道的泄漏扩散进行数值模拟,并得到了泄漏后CH4的体积分数分布和危险区域。研究结果表明:高原城市中压A天然气管道泄漏孔处的质量流量与平原地区一致,不受气压影响,高原城市中压B天然气管道泄漏的危险区域随时间的增加保持不变或变小。

To solve the problem of medium pressure natural gas leakage in plateau city zones, the influence of multi-layer, high-rise buildings and wind speed on the leakage and diffusion of gas pipelines is studied. By using CFD software to respectively simulate the leakage and diffusion of medium voltage A and medium voltage B natural gas pipeline under the plateau pressure, We locate the concentration distribution and the dangerous region of CH4 leakage. The research results show that the hole mass flow at the leakage of medium voltage A natural gas pipeline, like the plain area, is free from the influence of plateau city pressure. With time increases, the dangerous leakage region of medium voltage B natural gas pipeline in plateau city zones remains the same or smaller.