压差阻力波动对离心泵振动影响研究

Influence of pressure drag fluctuation on centrifugal pump vibration

基于流体的边界层理论,从理论上分析和阐述了压差阻力波动对离心泵振动的影响,并通过对比实验对其进行了验正。理论分析和实验的结果说明边界层分离将引起压差阻力。边界层分离的程度越大,引起的压差阻力也就越大。并验证了过大的压差阻力将使测试泵的性能急剧下降,振动剧烈。这表明压差阻力对振动的扰动强弱取决于边界层分离的程度。最后指出,这种波动对离心泵的水力振动具有决定性的影响。以及系统相关参数的波动是不可避免的,能够控制的是边界层分离点的位置。避免过早的分离将有助于抑制压差波动,降低振动。

On the basis of fluid theory of boundary layer, as an instance, practical pump is used to analyze and illustrate the influence of pressure drag fluctuation on centrifugal pump vibration in theory and it is proved by contrast test. The results show that boundary layer separation will produce the pressure drag. The greater is the degree of the separation, the higher is the pressure drag caused. It is proved that higher pressure drag will lower rapidly the property of testing pump and cause the acute vibration, which declares that the disturbance strength caused by pressure drag depends on the degree of boundary layer separation. In the end, it is stated that the fluctuation has a critical influence on hydro vibration, the fluctuation of relative parameters from system is inevitable and the position of separation point of boundary layer is able to control. Avoiding easier separation will be helpful to suppress the pressure fluctuation and lower the vibration.