波流联合作用下掺氢输气海管泄漏扩散研究  

Research on the diffusion of hydrogen-mixed gas leakage in submarinepipelines under wave-current interaction

作　　者：朱红钧[1] 黄栏 高岳[1] 唐堂 ZHU Hongjun;HUANG Lan;GAO Yue;TANG Tang(Petroleum Engineering School,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]西南石油大学石油与天然气工程学院,四川成都610500

出　　处：《海洋工程》2024年第3期107-118,共12页The Ocean Engineering

基　　金：国家自然科学基金面上项目(51979238);四川省杰出青年科学基金项目(2023NSFSC1953)。

摘　　要：由于氢气密度低,泄漏后的掺氢天然气在海洋波流作用下的浮升扩散行为有别于纯天然气,其泄漏扩散规律有待明晰。利用计算流体力学方法数值模拟了波流联合作用下掺氢输气海管泄漏扩散的过程,结果表明气体泄漏的过程可分为泄漏初期、向上浮升以及横向迁移3个阶段。当掺氢比φ_(H2)<50%时,氢气泡的运动轨迹受天然气泡的影响显著。气体浮升高度和扩散直径的变化与时间成正相关,且随着掺氢比的增大,泄漏气体到达液面所需的时间延长。天然气泡和氢气泡直径在上升的过程中都逐渐增大,两者的浮升速度随浮升高度的增加先增大后减小,天然气泡的浮升速度衰减更快。氢气泡直径随掺氢量的增加而增大,天然气泡直径随掺氢量的增大而减小,两者的上升速度随着掺氢量的增大都表现出先增大后减小的趋势,且氢气泡的上升速度大于天然气泡的上升速度。波长和海流流速越大,泄漏气体的扩散直径越大。Due to the low density of hydrogen,the buoyant diffusion behavior of hydrogen-mixed natural gas after leakage under the action of ocean waves and currents differs from that of pure natural gas,and its leakage and diffusion characteristics need clarification.The process of hydrogen-mixed gas leakage diffusion in submarine pipelines under wave-current interaction was numerically simulated using computational fluid dynamics methods.The results indicate that the gas leakage process can be divided into three stages:initial leakage,upward buoyancy,and lateral migration.When the hydrogen mixing ratioφ_(H2) is less than 50%,the trajectory of hydrogen bubbles is significantly influenced by natural gas bubbles.The changes in gas buoyancy height and diffusion diameter are positively correlated with time,and with the increase in hydrogen mixing ratio,the time required for the leaked gas to reach the liquid surface increases.Both natural gas and hydrogen bubble diameters gradually increase during ascent,with the buoyancy speed of both increasing and then decreasing with increasing buoyancy height,although natural gas bubble buoyancy speed decays more rapidly.The diameter of hydrogen bubbles increases with the increase in hydrogen mixing ratio,while the diameter of natural gas bubbles decreases with the increase in hydrogen mixing ratio.Both their ascent speeds exhibit a trend of increasing and then decreasing with increasing hydrogen mixing ratio,with the ascent speed of hydrogen bubbles greater than that of natural gas bubbles.The larger the wavelength and current velocity,the larger the diffusion diameter of the leaked gas.

关 键 词：气体泄漏 掺氢混输 泄漏扩散 气泡浮升 氢气 天然气 海底管道 

分 类 号：P756.2[天文地球—海洋科学] O359.1[理学—流体力学]