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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值也最小。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5.4%。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 order to study the influence of the structure and size of the speed control pig’s drain hole on the flow field at the drain of the pig during operation, taking the end plate type speed control pig as an example, four kinds of And other areas of the speed control pig drain hole model, and the simulation of the flow field characteristics of the model discharge hole, the results show that the other drain hole area, the different structures of the gas flow velocity at the basic However, the maximal turbulent kinetic energy of the gas flowing through the discharge orifice is quite different. It is proved through modeling that it is feasible to use a limited number of small-area bleed holes as a large-area bleed hole to predict the gas flow rate at the bleed holes. Compared with the circular and triangular drain structures, when the drain holes are square, the discharge capacity is better, and the turbulent kinetic energy of the gas flowing through the drain holes is also the smallest. Based on the simulation results, the structure of the orifice for speed control pig was designed. The industrial application shows that the model can predict the running speed of the pig speed control pig with the relative error less than 5.4%. The research results can provide the theoretical basis for the design of the drain plate of the end plate type speed control pig.