论文部分内容阅读
从近几年国内外发生的几起重大气体泄漏事故的情况来看,由于缺乏对有害气体迁移和输运规律的把握,频频发生人员疏散延误和盲目疏散等现象,因此对有毒有害气体迁移和输运规律的研究显得尤为重要。现有研究方法大多使用经验模型预测气体泄漏过程,但是这些模型无法模拟在存在建筑物、山体等复杂地形条件下的气体泄漏输运时产生的低洼积聚、地形导向等重要现象。该文利用计算流体力学方法求解Navier-Stokes方程,对泄漏发生后的流场内的有害气体组分流动进行了研究。在对开县天然气井喷过程的数值模拟中,成功模拟了有害气体输运的积聚、导向等现象,模拟结果和事故现场的定性和部分定量结果进行比较,得到较为一致的结论。
In recent years, there have been several major gas leak accidents at home and abroad. Due to the lack of understanding of the law of migration and transport of harmful gases, frequent evacuation delays and blind evacuation frequently occur. Therefore, toxic and harmful gas migration and The law of transport is particularly important. Most of the existing research methods use empirical models to predict gas leakage, but these models can not simulate the important phenomena such as low-lying accumulation and topographic guidance that occur during gas leakage and transport under complex terrains such as buildings and mountains. In this paper, Navier-Stokes equations are solved by computational fluid dynamics (CFD) method, and the flow of harmful gas components in the flow field after the leakage is studied. In the numerical simulation of blowout process of natural gas in Panyi County, the phenomena of accumulation and guidance of harmful gas transport were successfully simulated. The simulation results were compared with the qualitative results and some quantitative results at the accident site, and the conclusions were consistent.