速度控制清管器泄流孔流场仿真

Simulation on the flow field at the discharge hole of speed control pig

为了研究速度控制清管器泄流孔结构及尺寸对清管器运行时泄流孔处流场特性的影响,以端板型速度控制清管器为例,利用Fluent流体分析软件建立了4种等面积的速度控制清管器泄流孔模型,并对模型泄流孔处的流场特性进行了仿真分析,结果表明:在等泄流孔面积下,不同结构的泄流孔处气体流速基本一致,但气体流经泄流孔后最大湍流动能值相差较大。通过建模证明:将有限数量小面积泄流孔等效为一个大面积泄流孔预测泄流孔处气体流速的方法是可行的。与圆形、三角形泄流孔结构相比,泄流孔为正方形结构时,其泄流能力较好,气体流经泄流孔后的湍流动能也最小。利用仿真结果设计了速度控制清管器用泄流孔结构,工业应用表明:该模型能够很好地预测速度控制清管器的运行速度,且相对误差最大不超过5.3%。研究结果可为端板型速度控制清管器泄流孔的设计提供理论依据。

In this paper, the end-plate speed control pig was taken as an example to investigate the impacts of structure and size of the discharge hole in the speed control pig on the flow field at the discharge hole during the operation of the pig. 4 discharge hole models of same area for speed control pigs were established by using the fluid analysis software Fluent. Then, simulation analysis was conducted on the characteristics of flow field at the discharge holes in the models. It is shown that when the area of discharge holes is the same, the velocity of the gas through the discharge holes with different structures is basically accordant, but the maximum turbulent kinetic energy values after the gas flows through the discharge holes are different. It is proved by the modeling that it is feasible for the prediction of gas flow velocity through the discharge holes to take the limited number of small-area discharge holes to be equivalent to a large area hole. Compared with the discharge holes which are structurally circular or triangular, those of the square structure are better in discharge capacity and lower in turbulent kinetic energy after the gas flows through the discharge hole. Finally, the structure of the discharge hole in pigs was designed according to the simulation results. The industrial application indicates that the model can predict the running speed of speed control pig well, and the relative error is not more than 5.3%. The research results provide the theoretical basis for the design of the discharge holes in end-plate speed control pigs. （5 Figures, 2 Tables, 20 References）