离心泵内部不稳定流场压力脉动特性分

离心泵内部流场压力脉动是影响机组运行稳定性的关键因素,采用RNG k-ε湍流模型和滑移网格技术研究泵内部非定常流动,得到了不同工况下监测点的压力脉动情况,并对其进行了频域分析.分析结果表明,叶轮与隔舌间的动静干扰是产生压力脉动的主要脉动源,并在整个离心泵流道内传播;且在不同工况下,叶片通过频率均占主导地位,压力面脉动幅值大于吸力面脉动幅值;蜗壳出口同一测面脉动情况近似.

on Pressure Fluctuation of Unsteady Flow in a Centrifugal Pump

The pressure fluctuation of interflow fields in a centrifugal pump is a major factor affecting unit operating stability.The unsteady flow feature was investigated by RNG k-ε turbulence model with sliding mesh technology.The pressurefluctuation and the corresponding frequency spectra at different monitoring points for different operating conditions were obtained.The results showed that the main factor, which created the pressure fluctuation in the pump, was the interaction between the impeller and the tongue, and the pressure pulsation spread widely inside the whole passage.The results also indicated that the blade passagefrequency dominated for all operating conditions.The amplitude of the pressurefluctuations on the pressure side of the blade passage is larger than that on the suction side, and the pressure fluctuation was similar at the same measured surface for the outlet.