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为深入研究竖井贯流泵站机组振动产生的机理,以国内某大型竖井贯流泵站泵装置模型为例,基于ANSYS-CFX商用数值模拟软件,在不同工况下利用N-S方程和标准κ-ε方程模型分别计算全流道三维非定常湍流。结果表明,采样频率影响压力脉动特性预测、泵装置内压力脉动的主频率为叶片通过频率、在各工况下叶轮进口压力脉动从轮毂到轮缘逐渐增大、运行工况偏离设计工况时脉动幅度变大、水泵叶轮进口前的压力脉动沿轴向向前至0.5倍转轮直径处消失。通过对比泵站模型试验结果与数值模拟结果,验证了本文数值模拟结果的有效性。
In order to further study the mechanism of shaft vibration of vertical shaft pumping station, taking a pump model of a large vertical shaft pumping station in China as an example, based on ANSYS-CFX commercial numerical simulation software, NS equations and standard κ- The ε equation model is used to calculate the full three-dimensional unsteady turbulent flow. The results show that the sampling frequency affects the prediction of pressure pulsation characteristics. The main frequency of pressure pulsation in the pump device is the blade passing frequency. Under each condition, the pressure pulsation of impeller inlet increases gradually from the hub to the rim, and the operating conditions deviate from the design conditions The pulsation amplitude becomes larger, and the pressure pulsation before the inlet of the pump impeller disappears along the axial direction to the diameter of 0.5 times of the rotor. By comparing the pump station model test results with the numerical simulation results, the validity of the numerical simulation results in this paper is verified.