Abstract
Pressure and vibration displacement value are relatively measured by 14 pressure sensors and 2 vibration sensors distributing inside the tank-type model axial flow pump device under different flow rates. By comparison, it is found that the pressure pulsation on the inlet of the impeller is the main cause of hydraulic induced vibration of the pump device, and it is found to have similar amplitude trend with the vertical vibration as the flow rates increases and large correlation coefficient with the horizontal vibration under high flow rates through time-domain analysis. By frequency-domain analysis, it is found that the main frequency of pressure pulsation is three multiplies of the shaft frequency, but it is one multiplies of vertical vibration, and it changes from one multiplies to three multiplies of horizontal vibration. Combining with the analysis of phase-flow rates characteristics of both pressure pulsation and vibration, it is concluded that, for the horizontal vibration, the frequency ingredient of one multiplies ranging from low to high flow rates and three multiplies removing from unstable and high flow rates zone are possibly induced by pressure pulsation on the inlet of impeller, while for the vertical vibration, the frequency ingredient of one multiplies under design flow rates and high flow rates are possibly induced by pressure pulsation on the inlet of impeller. Both the horizontal and vertical vibrations with frequency of two multiplies have little relationship with the pressure pulsation on the inlet of impeller.
Highlights
The application of axial flow pump is extremely extensive and it plays a very important role in the national economy
Zhao et al.[18] simulates the structural vibration response induced by the fluid pressure pulsation in the vertical axial flow pump by using the finite element analysis software, and the results show that the calculation method can be used to predict the vibration acceleration with blade frequency if the pressure pulsation is known, which points out that if the number of sampling points is increased, the sampling frequency is increased, and the recognition ability of the high frequency can be improved
Yuan[19] studies the fluid-solid coupling vibration characteristics of the blade of axial flow pump and indicates that the maximum equivalent stress in the blade appears on the water inlet side of the blade root, and the gradient of stress changes is large at this location, which is prone to fatigue damage
Summary
The application of axial flow pump is extremely extensive and it plays a very important role in the national economy.
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