输油管道双转角弯管内多相介质流动特性研究

STUDY ON CHARACTERISTICS OF MULTIPHASE MEDIUM FLOW IN DOUBLE CORNER ELBOW OF OIL PIPELINE

为揭示网管内多相流流动机理指导管网系统优化设计,采用Eulerian-Eulerian方法,运用雷诺应力模型对不同雷诺数下双转角弯管内流场特性及多相介质分布规律进行数值模拟,分析了弯管内速度场、压力场、浓度场以及涡流的分布,对不同雷诺数下管道内部及出口位置多相介质分布进行系统分析。结果表明,弯管内的涡流不仅影响速度场分布,同时也会使管道局部压力升高,并扰乱离散相介质运动轨迹。涡流发生的位置主要集中于弯管出口处,涡流区内轻质相分布于涡流中心,重质相分布于涡流外侧。随着雷诺数的增大,涡流强度升高,管道局部压力上升。

By Eulerian-Eulerian method the Reynolds stress model( RSM) of the computational fluid dynamics( CFD) is used to simulated the velocity field,pressure field,concentration field and vortex flow of the bend pipe. Results show that vortex flow not only influences the velocity field but also increase the partial pressure and disturb the movement trajectory of discrete phase. Vortex flow is concentrated in the exit of bend,oil concentrated in the center of vortex,solid concentrated in the outside of vortex flow. Vortex flow is enhanced with the increasing of Reynolds number,and the local pressure increases in bend pipe.