含运动杆及接箍的管流流动的数值模拟研究

Numerical simulation of flowfield in the tube with a moving pole and hoop inside

作为含抽油杆的输油管的简化模型 ,本文通过流场的直接数值模拟研究含运动杆及接箍的管流在不同时刻的流动结构。控制方程为非定常Navier Stokes方程 ,采用Jameson的有限体积格式 ,以双时间步长方法进行时间推进。计算结果表明 ,接箍附近的流动结构最为复杂 ,随流速的变化 ,这部分区域形成剪切层 ,并有旋涡产生 ,直管中的平均速度分布也随时间和位置的变化而不同 ,文中同时给出了运动杆上的压力和粘性应力随时间的变化 。

The flowfield in the tube with a moving pole and hoop was numerically simulated by solving the Navier Stokes equations. Jameson's finite volume scheme and the dual time stepping procedure were used. The numerical results indicate that a mixing layer is formed near the hoop and the mean flow velocity varies with time. The pressure and viscous shear force distribution were calculated. The numerical results are satisfactory compared with the experimental results.