造纸用三叶凸轮转子泵的内部流场数值模拟研究

Numerical Simulation Study on the Internal Flow Field of Three Leaf Cam Rotary Pump for Paper Making

三叶凸轮转子泵内部流场的特性对其性能和可靠性具有重要影响,因此进行内部流场分析是十分有必要的。为此,进行造纸用三叶凸轮转子泵的内部流场数值模拟研究,建立三叶凸轮转子泵的三维实体模型并对其划分网格,设置边界条件和流体属性;在此基础上,建立四个流体运动控制方程,利用CFX软件中压力求解器对流体运动控制方程进行求解。结果表明:在0.20 s、0.22 s、0.24 s时,上转子基元内的流场压力逐渐增大,下转子基元逐渐向转子泵的出口方向移动;在0.26 s到0.28 s时,下转子基元逐渐与出口连通,泵内流场压力重新趋于稳定。在0.20 s、0.22 s时,由于转子基元还未完全与出口段相连通,因此高速区域中心位于靠出口段下方,之后随着转子的转动,在0.24 s、0.26 s、0.28 s时,转子基元与出口段连通,内部流体流量开始逐渐减少,高速区域中心也开始向上方移动。

The characteristics of the internal flow field in a three-blade cam rotor pump have an important influence on its performance and reliability,so it is necessary to analyze the internal flow field.Therefore,the numerical simulation of the internal flow field of a three-leaf cam rotor pump for papermaking was carried out.Establishing a three-dimensional solid model of a three-leaf cam rotor pump,meshing the three-leaf,and setting boundary conditions and fluid properties;On this basis,four fluid motion control equations are established and solved by pressure solver in CFX software.The results show that at 0.20 s,0.22 s and 0.24 s,the pressure of the flow field in the upper rotor element gradually increases,and the lower rotor element gradually moves towards the outlet of the rotor pump.From 0.26 s to 0.28 s,the lower rotor element gradually communicates with the outlet,and the pressure of the flow field in the pump tends to be stable again.At 0.20 s and 0.22 s,the center of the high-speed area is located below the exit section because the rotor element is not completely connected with the exit section.Then,with the rotation of the rotor,at 0.24 s,0.26 s and 0.28 s,the rotor element is connected with the exit section,and the internal fluid flow begins to decrease gradually,and the center of the high-speed area also begins to move upward.