高扬程贯流泵湍流流动及流固耦合数值模拟

Numerical Simulation of Turbulent Flow and Fluid Solid Coupling in High Lift Tubular Pump

基于设计完成的高扬程贯流泵模型,应用Ansys Workbench软件,对高扬程后置灯泡式贯流泵内部的流动情况及结构静应力进行数值模拟,模拟讨论了在不同工况下的高扬程贯流泵运行时的湍流流动,在小流量工况下,贯流泵内部流态紊乱,会产生噪音及空化等问题;继而采用单向流固耦合的方法,模拟不同工况下泵叶轮部分的流动情况,最大等效应力随半径减小而增大,应力集中出现于工作面与轮毂交接处,形变则随着半径增大而增大,其最大值出现在轮缘处。在进行高扬程贯流泵优化设计时,需注意小流量工况时的流动特性及叶轮根部的强度校核。

Based on the designed high-lift tubular model and the application of Ansys Workbench software, it carried out numerical simulation of internal flows in a post-positioned shaft tubular pump with high lift and fluid-structure interaction in its impellers and simulated and discussed the stability of the high lift tubular pump under different working conditions. Under the condition of small flow rate, the flow pattern of the tubular pump was disturbed, resulting in noise and cavitation. In addition, the method of one-way fluid-structure coupling was used to analyze the equivalent static stress and shape variables of the impeller under different working conditions. The results are as follows: the maximum equivalent stress appears at the junction of the blade working face and the hub under the design condition, the shape variable of the impeller increases with the increase of the radius, the largest shape variable appears near the rim. Therefore, when optimizing the design of the high-lift tubular pump, we should pay attention to the flow characteristics and check the strength of the impeller root.