浆体管道三通后的单孔消能孔板流场研究

Study on Flow Field of the Single-hole Orifice after Tee in Slurry Pipeline

为了研究浆体管道三通后的单孔消能孔板流场,使用Fluent对不同流量和孔板安装位置(孔板与三通相连或在三通下游0.5 m)的流场进行了数值模拟。首先,工况1孔板后管道北侧出现回流,将对管壁造成冲蚀,工况2孔板后流动未出现明显回流。其次,工况1管道水平段中轴线上的压力沿流向先减小后增大,在三通前取得最小值,在关闭的阀门处取得最大值,但压力波动幅度较小。工况2的压力变化趋势与工况1的类似。最后,安装孔板的管道竖直段中轴线上的压力沿流向先减小后增大。工况2较工况1的消能能力有小幅提升,但压力恢复平稳的位置也往下游移动了约0.5 m。

In order to investigate the flow field of single-hole orifice after tee in slurry pipeline,the software Fluent was used to stimulate the condition of different flow rate and different install place of orifice——condition 1:the orifice plate is connected with the tee;Condition 2:the orifice plate is 0.5 m away from the downstream of the tee.Firstly,backflow occurred on the north side of the pipeline behind the orifice plate in condition 1,which would cause erosion on the pipe wall,while no obvious backflow appeared after the orifice plate in condition 2.Secondly,the pressure on the central axis of the horizontal section decreased first,then increased along the flow direction in condition 1.The minimum value is obtained before the tee and the maximum value is obtained at the closed valve,but the fluctuation range of the pressure is small.The pressure variation trend of condition 2 is similar to that of condition 1.Lastly,the pressure on the central axis of the vertical section of the pipe,where the orifice plate was installed,decreased first,then increased along the flow direction.The energy dissipation capacity of condition 2 is slightly improved compared with that of condition 1,but the stable position of pressure recovery is also moved to the downstream by about 0.5 m.