【摘要】 基于欧拉双流体模型,结合颗粒动力学理论,研究不同水合物颗粒体积分数、不同流速下非均匀颗粒水合物浆液流动过程中水合物颗粒聚集行为、流动压降及浆液速度分布。结果表明:浆液流动压降主要受流速影响,速度越大压降越大。颗粒体积分数在20%—35%,压降变化很小,当颗粒体积分数达到55%时,压降明显变大。水合物颗粒聚集程度随流速增大而降低,低水合物颗粒体积分数下,颗粒聚集呈悬浮状。随颗粒体积分数增大,水合物颗粒呈堆积状聚集,易造成管道堵塞;水合物浆速度梯度随颗粒体积分数增大而增大。随流速增大,速度由非对称变成对称分布,出现较大的速度梯度。保障水合物浆稳定安全流动存在一个临界颗粒体积分数和经济流速。数值模拟为水合物浆液管道输送技术的研究提供理论参考。更多还原

【Abstract】 Based on Eulerian two-fluid approach and granular kinetic theory,the gas hydrate particle aggregation behavior,the pressure drop and the slurry velocity distribution of inhomogeneous granular hydrate slurry flow at different particle volume fraction and velocities were studied. The results indicate that pipeline pressure drop is mainly affected by flow rate. The faster the velocity,the much higher pressure drop. When the particle volume fraction is between 20%-35%,the pressures drop changes little. Once the particle volume fractions reach 55%,the pressure drops increase significantly. The hydrate particle aggregation decreases as the velocity increases. Under the low volume fraction of hydrate particles,the particles are suspending and aggregating. With the increase of the hydrate particle volume fraction,cluster formation enhance gradually,which may readily cause pipe blockage. As the radial velocity gradient is intensified with the hydrate particles volume fraction. When the velocity of slurry increases,the velocity distribution is changed from asymmetric to symmetric. The larger velocity gradient is appeared. There is a critical particle volume fraction and a economical flow rate for the stable and safe flow of hydrate slurry. The study provides theoretical reference for the research of hydrate slurry pipeline transportation technology.更多还原