离心泵多流量工况振动特性试验研究

为了解流量对离心泵振动特性影响的具体表现,选用单级单吸式离心泵为研究对象,利用试验方法,对涵盖小流量、设计流量和大流量等工况在内的7个流量下泵体上的5个测点,进行了振动数据的采集和分析.试验结果表明:振动烈度与流量的关系(V-Q)较效率与流量的关系(η-Q)更为复杂,V-Q曲线上的峰值与流量变化过程中的流致振动相关;多个径向振动测点的V-Q变化趋势大致相同,而轴向与径向振动测点间的V-Q变化趋势则差别较大;流量三维频谱图可以清晰地反映流量变化过程中振动频谱的变化过程.并进一步探讨了效率最优点与振动烈度的关系、流致振动的频谱特征等.研究得到了流量对离心泵振动特性影响的一些具体表现,为水泵等旋转机械相关振动特性的研究与应用提供了借鉴和参考.

Vibration characteristics study of centrifugal pumps

Effects of the flow rates on the vibration characteristics of a centrifugal pump were investigated using experimental methods and the flow rate three-dimensional spectrum graph methods. The test data at 5 test points under 7 flow rates, including small flow rates, high flow rates and the designed flow rate, were collected and analyzed. Results show that the relationship(V-Q)between vibration intensity(V)and flow rate(Q)is more complicated than that(η-Q)between efficiency(η)and flow rate(Q). Peaks of V-Q curves are related to fluid-induced vibration during the changing process of flow rate. There have significant difference between V-Q curve of axial vibration test and that of radial vibration test, while the latter basically have the same trend. Flow rate three-dimensional spectrum graph is able to reflect the changing process during the flow rate change. In addition, the spectrum characteristics of the fluid-induced vibration and the relationship between the best efficiency point(BEP)and vibration intensity were discussed.