叶轮起旋水合物管道螺旋流动及传热数值模拟

摘要

The spiral suspension flow of gas hydrate particles transportation system in gas pipeline is further studied by establishing a three-dimensional model of spiral flow in round pipe.The RNG k-ε model and DPM model are used to conduct three-dimensional transient numerical simulation on gas-solid two-phase spiral flow and heat transfer in natural gas pipeline.The velocity field,wall shear force,dwell time of hydrate particles,concentration distribution of hydrate particles and heat transfer are mainly studied at different cross sections of hydrate pipeline.The results of numerical simulation show that the spiral flow has strong particle carrying capacity,which has positive effect on enhancing the heat transfer between hydrate particles and preventing the plugging of hydrate in the gas pipeline.The study provides a theoretical guidance to the running safety of gas pipeline.%为了进一步研究输气管道中天然气水合物颗粒输送体系的螺旋悬浮流动规律,建立了圆管螺旋流的三维模型.采用RNG k-ε模型和DPM模型对天然气管道内的气固两相螺旋流动和传热进行了三维瞬态数值模拟.主要研究了水合物管道内不同横截面的速度场、壁面剪切力、水合物颗粒停留时间、水合物颗粒浓度分布规律以及传热规律.研究结果表明:螺旋流具有较强的颗粒携带能力,对增强水合物颗粒之间的传热,防治输气管道中水合物堵塞问题有较好的效果.研究结果可为保障输气管道的安全输送提供理论指导.