中文摘要：

基于有限体积法，建立了管道运输高压氢气及天然气的泄漏扩散模型，考虑到氢气与天然气的管道泄漏事故危险性不同，进行了数值模拟与对比，得出了管道泄漏后氢气与天然气的不同泄漏扩散特性。结果表明：高压氢气的泄漏扩散形成的危险云团较大而且集中；氢气初始的泄漏速度比天然气大得多，与周围环境达到压力平衡所需时间较天然气短；随着扩散时间的增加，氢气危险气体云团扩散最大高度较天然气增加得快；在近地面区氢气泄漏扩散产生的危险后果较天然气小。

英文摘要：

A numerical model for dispersion of hydrogen and natural gas due to pipeline leakage was established based on finite volumetric method in this paper. And corresponding numerical simulations was done. The different characteristics of dispersion between hydrogen and natural gas due to pipeline leakage was also obtained. The results show that the hazard region of hydrogen is more concentrated than natural gas; the maximum value of jet velocity of hydrogen is larger than natural gas, thus, the leaking time of hydrogen is less than natural gas; there is a longer transportation distance of hazard region of hydrogen than natural gas with increasing time; the risk of hydrogen is smaller than natural gas near the ground due to pressured pipeline leakage.