Effect of blade outlet angle on radial thrust of single-blade centrifugal pump

Geometrically, the single-blade centrifugal impeller, commonly used today as a sewage pump, is not axially symmetric. For this reason, the static pressure around the impeller fluctuates greatly when the impeller is rotating, and not only the radial thrust but also the axial thrust shows large fluctuations. Therefore, it is extremely important for the improvement of pump reliability to quantitatively grasp these fluctuating hydrodynamic forces. In this study, we investigated the unsteady hydrodynamic forces in a closed-type centrifugal pump with a single blade for different blade outlet angles using a numerical analysis that takes into account both experiment and the leakage flow. The results clearly showed the effect of the blade outlet angle on that act on the impeller. The root-mean-square value of the fluctuating component of the total radial thrust was roughly the same for whichever impeller at low flow rate, but at high flow rates, the value increased for impellers with larger blade outlet angles. Moreover, when the leakage flow rate increased with increasing static pressure around the impeller, such that the rear and front shroud parts were subject to high pressure, the absolute value of the axial thrust on both these parts increased.

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The influence of blade outlet angle on the performance of centrifugal pump with high specific speed

Vacuum ◽

10.1016/j.vacuum.2018.10.049 ◽

2019 ◽

Vol 159 ◽

pp. 239-246 ◽

Cited By ~ 8

Author(s):

Hongchang Ding ◽

Zikang Li ◽

Xiaobin Gong ◽

Maoshun Li

Keyword(s):

Centrifugal Pump ◽

Outlet Angle ◽

Specific Speed

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Radial Thrust of Single-Blade Centrifugal Pump

International Journal of Fluid Machinery and Systems ◽

10.5293/ijfms.2011.4.4.387 ◽

2011 ◽

Vol 4 (4) ◽

pp. 387-395 ◽

Cited By ~ 5

Author(s):

Yasuyuki Nishi ◽

Junichiro Fukutomi ◽

Ryota Fujiwara

Keyword(s):

Centrifugal Pump ◽

Radial Thrust

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Influence of Blade Outlet Angle on Inner Flow Field of Centrifugal Pump Transporting Salt Aqueous Solution

Chinese Journal of Mechanical Engineering ◽

10.3901/cjme.2009.06.912 ◽

2009 ◽

Vol 22 (06) ◽

pp. 912 ◽

Cited By ~ 2

Author(s):

Minguan YANG

Keyword(s):

Aqueous Solution ◽

Flow Field ◽

Centrifugal Pump ◽

Outlet Angle

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Effect of Blade Outlet Angle on Acoustics of Marine Centrifugal Pump

Acoustics Australia ◽

10.1007/s40857-020-00195-1 ◽

2020 ◽

Author(s):

Hongli Zhang ◽

Fanyu Kong ◽

Aixia Zhu ◽

Fei Zhao ◽

Zhenfa Xu

Keyword(s):

Centrifugal Pump ◽

Outlet Angle

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3D Quasi-Unsteady Flow Simulation in a Centrifugal Pump: Comparison With the Experimental Results

Volume 2, Parts A and B ◽

10.1115/ht-fed2004-56600 ◽

2004 ◽

Cited By ~ 3

Author(s):

Miguel Asuaje ◽

Farid Bakir ◽

Andres Tremante ◽

Ricardo Noguera ◽

Robert Rey

Keyword(s):

Unsteady Flow ◽

Centrifugal Pump ◽

Cfd Simulation ◽

Pressure Fluctuations ◽

Pressure Sensors ◽

Flow Simulation ◽

Turbulence Models ◽

Numerical Predictions ◽

Radial Thrust ◽

Unsteady Flow Simulation

A 3D-CFD simulation of the impeller and volute casing of a centrifugal pump has been performed using commercial codes CFX 5.5 and CFX-TASCflow 2.12. The pump has an specific speed of 32 (metric units) and an outside impeller diameter of 400 mm. First, a 3D-flow simulation for the isolated impeller with a structured grid is presented. A sensitivity analysis regarding grid quality and turbulence models were also performed. A 3D quasi-unsteady flow simulation of the impeller-volute assembly is presented, as well. This flow simulation was carried out for several impeller blades and volute tongue relative positions. As a result, the radial thrust on the pump shaft were calculated for different flow rates. Experimental test were carried out in order to compare theoretical pressure fluctuations with the experimental ones measured by various unsteady pressure sensors placed on the impeller shroud and volute. The qualitative and quantitative results ratify numerical predictions.

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