Experimental investigation of floor-attached vortex effects on the pressure pulsation at the bottom of the axial flow pump sump

The pressure pulsation test in an axial flow pump with and without the floor-attached vortex was performed. Pressure sensors were mounted on the impeller inlet section and impeller outlet section and guide vane section outlet of the axial flow pump. The investigations showed that the pressure pulsation in the axial flow pump was mainly affected by the impeller rotation. The time-domain characteristic curves of the pressure pulsation at the impeller inlet and outlet changed the most at different periods when the floor-attached vortex appeared in the pump sump. There was no significant difference between the time-domain characteristic curves of the pressure pulsation with and without the floor-attached vortex at the guide vane outlet. The pressure pulsation induced by the floor-attached vortex was a low-frequency pulsation of 2.12 Hz, which fluctuates periodically with time in the form of a trigonometric function. The pressure pulsation amplitudes with the floor-attached vortex were larger than those without the floor-attached vortex. The floor-attached vortex mainly affected the pressure pulsation in the impeller and had less influence on the pressure pulsation at the guide vane outlet due to the rectifying effect of the guide vane.

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Investigation into the Influence of Division Pier on the Internal Flow and Pulsation in the Outlet Conduit of an Axial-Flow Pump

Applied Sciences ◽

10.3390/app11156774 ◽

2021 ◽

Vol 11 (15) ◽

pp. 6774

Author(s):

Fan Yang ◽

Dongjin Jiang ◽

Tieli Wang ◽

Pengcheng Chang ◽

Chao Liu ◽

...

Keyword(s):

Velocity Distribution ◽

Pressure Pulsation ◽

Axial Flow ◽

Hydraulic Loss ◽

Main Frequency ◽

Starting Position ◽

The Difference ◽

Axial Flow Pump ◽

Outlet Conduit ◽

Flow Pump

The outlet conduit is an important construction connecting the outlet of the pump guide vane and the outlet pool; in order to study the hydraulic performance of the straight outlet conduit of the axial-flow pump device, this paper adopts the method of numerical simulation and analyzes the influence of the division pier on the pressure and velocity distribution inside and near the wall of the straight outlet conduit based on three design schemes. Four pressure pulsation measuring points were arranged in the straight outlet conduit, and the low-frequency pulsation characteristic information inside the straight outlet conduit with and without the division pier was extracted by wavelet packet reconstruction. The results show that the addition of a division pier has an effect on the hydraulic loss, near-wall pressure and velocity distribution in the straight outlet conduit. A small high-pressure zone is formed near the wall at the starting position of the division pier, and a large high-speed zone is formed on the left side at the starting position of the division pier. The length of the division pier has no significant effect on the flow distribution of the straight outlet conduit and the pressure and velocity distribution near the wall. Under different working conditions, each monitoring point has the maximum energy in the sub-band (0~31.25 Hz). With the increase of the flow rate, the total pressure energy of the straight outlet conduit decreases gradually. Under each condition, the difference of the energy proportion of the horizontal monitoring points of the straight outlet conduit is small, and the difference of the energy proportion of the two monitoring points at the top and bottom of the outlet channel is relatively large. The energy of the two monitoring points in the straight outlet conduit with a division pier is smaller than that of the two monitoring points in the straight outlet conduit without a division pier. There are differences in the main frequency and the power spectrum corresponding to the main frequency of the monitoring points in the straight outlet conduit, and the reasonable setting of the division pier is conducive to reducing the pressure pulsation of the flow in the straight outlet conduit and is beneficial to the safe and stable operation of the pump device.

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Experimental investigation on the correlation of pressure pulsation and vibration of axial flow pump

Advances in Mechanical Engineering ◽

10.1177/1687814019889473 ◽

2019 ◽

Vol 11 (11) ◽

pp. 168781401988947

Author(s):

Xiaohui Duan ◽

Fangping Tang ◽

Wenyong Duan ◽

Wei Zhou ◽

Lijian Shi

Keyword(s):

Pressure Pulsation ◽

Axial Flow ◽

Domain Analysis ◽

Vertical Vibration ◽

High Flow ◽

Design Flow ◽

Flow Rates ◽

Horizontal Vibration ◽

Axial Flow Pump ◽

Flow Pump

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.

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Multiobjective Optimization Design and Experimental Investigation on the Axial Flow Pump with Orthogonal Test Approach

Complexity ◽

10.1155/2019/1467565 ◽

2019 ◽

Vol 2019 ◽

pp. 1-14 ◽

Cited By ~ 7

Author(s):

Yuquan Zhang ◽

Yanhe Xu ◽

Yuan Zheng ◽

E. Fernandez-Rodriguez ◽

Aoran Sun ◽

...

Keyword(s):

Multiobjective Optimization ◽

Frequency Analysis ◽

Pressure Pulsation ◽

Axial Flow ◽

Orthogonal Test ◽

Test Scheme ◽

Analysis Method ◽

Shaft Power ◽

Axial Flow Pump ◽

Flow Pump

A multiobjective optimization technique based on the computational fluid dynamics (CFD) simulations and the orthogonal test is proposed to reduce the pressure pulsation in this paper. Three levels of four well-known performance factors L9 (34) were considered in the orthogonal test scheme: the number of blades, the blade setting angle, the hub ratio, and the distance between the blade and the guide vane. The evaluation indexes corresponded to the head, efficiency, shaft power, and pressure pulsation, respectively. An optimal configuration A2B1C2D3 was obtained by comprehensive frequency analysis method, after intuitive and range analysis. In comparison with the nonoptimized model, the new design’s head and efficiency increased by 17.8% and 4.26%, whilst the shaft power and the pressure pulsation coefficient reduced by 1.22% and 11%, respectively. Experiments conducted on the optimized pump were consistent with the CFD model. Six different rotational speed conditions in the optimal operating points were numerically calculated in order to explore the internal hydraulic characteristics of the optimized axial flow pump. It is verified that the comprehensive frequency analysis method based on the orthogonal test approach is effective for the multiobjective optimization of the axial flow pump.

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Numerical and experimental investigation of tip leakage vortex trajectory and dynamics in an axial flow pump

Computers & Fluids ◽

10.1016/j.compfluid.2015.01.010 ◽

2015 ◽

Vol 112 ◽

pp. 61-71 ◽

Cited By ~ 69

Author(s):

Desheng Zhang ◽

Weidong Shi ◽

B.P.M. (Bart) van Esch ◽

Lei Shi ◽

Michel Dubuisson

Keyword(s):

Experimental Investigation ◽

Axial Flow ◽

Tip Leakage Vortex ◽

Tip Leakage ◽

Axial Flow Pump ◽

Flow Pump

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Numerical and experimental investigation of tank-type axial-flow pump device

Advances in Mechanical Engineering ◽

10.1177/1687814017695681 ◽

2017 ◽

Vol 9 (3) ◽

pp. 168781401769568 ◽

Cited By ~ 6

Author(s):

Lijian Shi ◽

Fangping Tang ◽

Rongsheng Xie ◽

Weipeng Zhang

Keyword(s):

Experimental Investigation ◽

Axial Flow ◽

Axial Flow Pump ◽

Flow Pump

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Corrigendum to “Multiobjective Optimization Design and Experimental Investigation on the Axial Flow Pump with Orthogonal Test Approach”

Complexity ◽

10.1155/2020/6537105 ◽

2020 ◽

Vol 2020 ◽

pp. 1-2

Author(s):

Yuquan Zhang ◽

Yanhe Xu ◽

Yuan Zheng ◽

E. Fernandez-Rodriguez ◽

Aoran Sun ◽

...

Keyword(s):

Experimental Investigation ◽

Multiobjective Optimization ◽

Optimization Design ◽

Axial Flow ◽

Orthogonal Test ◽

Axial Flow Pump ◽

Flow Pump

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An Investigation of the Vortex in a Submersible Axial Flow Pump Impeller

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.741.481 ◽

2015 ◽

Vol 741 ◽

pp. 481-485

Author(s):

Hong Ming Zhang ◽

Li Xiang Zhang

Keyword(s):

Pressure Pulsation ◽

Axial Flow ◽

Suction Side ◽

Transfer Model ◽

Mass Transfer Model ◽

Governing Equations ◽

Pump Impeller ◽

Axial Flow Pump ◽

Volume Method ◽

Flow Pump

The paper presents numerical simulation of the vortex in a submersible axial flow pump impeller using OpenFoam code. A mixture assumption and a finite rate mass transfer model were introduced to analyze vortex. The finite volume method is used to solve the governing equations of the mixture model and the pressure-velocity coupling is handled via a Pressure Implicit with Splitting of Operators (PISO) procedure. Simulation results have shown that the cavitation may occur on the lower portion of impeller suction side. And the blade channel vortex will be formed in the impeller. It can induce the pressure pulsation in the impeller and can result in reduced efficiency of the submersible axial flow pump.

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