提升管T型弯头二维数值模拟

　　

摘 要：本文基于计算流体力学理论知识，采用大型流体工程仿真计算商用软件Gambit和Fluent 6.3对2D提升管T型弯头进行数值仿真研究，在特定的操作参数下，考察了内部流场的压力特性和速度特性，运用DPM模型追踪颗粒的运动，探究了不同的盲管高度对流场的影响。结果表明：提升管竖直段的压力呈“C型”分布，盲管部分会出现回旋流与颗粒反混，导致局部负压的产生，结合动压场和速度场定性解释了颗粒的沉积现象产生的原因，追踪颗粒的运动轨迹，统计颗粒停留时间的高斯分布，均值为0.2，方差为0.00458，盲管高度在50~100 mm时，颗粒运动轨迹平滑不杂乱，T型弯头内部流场比较稳定，压降损失相对较小，对器壁的冲蚀影响相对较弱，可以为提升管的优化设计提供参考。

Abstract：Based on the Computational Fluid Dynamics theory, this paper used simulating and calculating business software of large scale fluid engineering (Gambit and Fluent 6.3) to simulate a 2D riser with a T-abrupt exit. Under specified operation parameters, the pressure field and velocity field of riser inner flow have been investigated, and the DPM model was used to track the movement of particles and explore the influence of different height blind pipe on the flow field. The simulation results show that the riser of vertical pressure present “C-shape” distribution, swirling flow and particles back mixing appear on blind pipe, which result in topical negative pressures. Combined with dynamic pressure and velocity field, the causes of particles deposition qualitatively have been explored too. Tracking the particles trajectory and counting Gaussian distribution of particle residence time, the average is 0.2 and variance is 0.00458. When the blind pipe height is between 50~100 mm, the particles trajectory is smooth and orderly, the inner flow field of the T-abrupt is relatively stable, the loss of pressure drop is relatively small, and the erosion effect is relatively weak, which can provide a reference for the optimal design of the riser.

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