泵内非定常压力脉动会引发泵体的结构振动，运行工况的变化会改变泵内流场的流动状态，从而对泵的振动特性产生影响。通过流体力学计算软件FLUENT对某台立式轴流泵内流场进行仿真计算，分别改变泵运行速度和流量两项参数，得出转速改变后，叶轮受到的力会偏离了相似理论的计算值；工作在小流量时，泵内压力脉动与叶轮受力均大于大流量工况，且叶轮区域出现流动分离现象，不利于振动噪声的控制。%Abastract : Structural vibration of a pump is partly caused by pressure pulsation of unsteady flow in the pump, the change of flow field within the pump is caused by the change of working conditions, and the vibration characteristics of the pump will be affected. In this paper, the unsteady flow field of an axial flow pump is simulated by means of FLUENT software with the steady flow as the initial field. The results of excitation force of flow on the pump and the impeller is calculated and analyzed under different working conditions. The results show that pressure pulsation on the blade deviates from the calculation data based on the similarity theory when rotating rate changes. With the flow rate decreasing, the pressure pulsation will increase, and separate flow will occur in the impeller area.
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