海底天然气管道单孔泄漏冲击波的数值模拟研究

Numerical Simulation on Single-hole Leakage Shock Wave of Submarine Natural Gas Pipeline

海底天然气管道泄漏瞬间产生巨大的冲击波,可能会造成水下冲击爆炸。基于VOF多相流模型和组分传输模型,建立了海底天然气管道单孔泄漏扩散的数值模型,对海底天然气管道单孔泄漏气体扩散规律及其冲击波的形成过程进行数值模拟计算与分析,并在此基础上,通过正交试验,选取泄漏速率、泄漏孔径和海水流速3个影响因素,对监测点处气体泄漏冲击波的动态压力进行多因素耦合分析。结果表明:气体泄漏冲击波的形成过程可分为起始阶段、冲击阶段和衰减阶段三个阶段;泄漏孔径、泄漏速率和海水流速对单孔气体冲击波动态压力的影响程度依次减弱。

The leakage of submarine natural gas pipelines immediately generates huge shock waves, which may cause underwater explosion disasters.Therefore, on the basis of the VOF(Volume of Fluid) multiphase flow model and the species transport model,this paper establishes a numerical model for single hole leakage diffusion of submarine natural gas pipeline, carries out numerical simulation calculation and analysis on the leakage diffusion law of natural gas and the shock wave formation process.Then the paper selects three factors including leakage rate,leakage aperture and seawater flow rate to conduct multifactor coupling analysis on the dynamic pressure of the shock wave of the leaking gas at the monitoring points through orthogonal test. The results show that the gas leakage shock wave formation process have three stages, the initial stage,the impact stage and the attenuation stage. The extent of the leakage aperture fleakage rate and seawater flow rate on the leakage wave of the submarine natural gas pipeline is weakened gradually.