CFD Analysis of Hydraulic Performance in Small Centrifugal Pumps Operating with Slurry

2019 ◽  
Vol 12 (6) ◽  
pp. 364
Author(s):  
Gaudy Prada Botia ◽  
Guillermo Valencia Ochoa ◽  
Jorge Duarte Forero
Keyword(s):  
Hydraulic Performance ◽  
Cfd Analysis ◽  
Centrifugal Pumps

Prediction of the Effect of Impeller Trimming on the Hydraulic Performance of Low Specific-Speed Centrifugal Pumps

2018 ◽  
Vol 140 (8) ◽  
Author(s):  
D. G. J. Detert Oude Weme ◽  
M. S. van der Schoot ◽  
N. P. Kruyt ◽  
E. J. J. van der Zijden
Keyword(s):  
Flow Field ◽  
Prediction Method ◽  
Hydraulic Performance ◽  
New Method ◽  
Prediction Methods ◽  
Centrifugal Pumps ◽  
Flow Rates ◽  
Pump Head ◽  
Low Specific Speed ◽  
Specific Speed

The effect of trimming of radial impellers on the hydraulic performance of low specific-speed centrifugal pumps is studied. Prediction methods from literature, together with a new prediction method that is based on the simplified description of the flow field in the impeller, are used to quantify the effect of trimming on the hydraulic performance. The predictions by these methods are compared to measured effects of trimming on the hydraulic performance for an extensive set of pumps for flow rates in the range of 80% to 110% of the best efficiency point. Of the considered methods, the new prediction method is more accurate (even for a large impeller trim of 12%) than the considered methods from literature. The new method generally overestimates the reduction in the pump head after trimming, and hence results less often in impeller trims that are too large when the method is used to determine the amount of trimming that is necessary in order to attain a specified head.

Hydraulic Design Validation of the Suction Intake of a Vertical Centrifugal Pump Station by Use of Computational Fluid Dynamic (CFD) Analysis

2005 ◽  
Author(s):  
Edmondo Minisci ◽  
Haysam Telib ◽  
Giancarlo Cicatelli
Keyword(s):  
Numerical Simulation ◽  
Complex Geometry ◽  
Fluid Dynamic ◽  
Cfd Analysis ◽  
Centrifugal Pumps ◽  
Design Validation ◽  
Scaled Model ◽  
Correct Operation ◽  
Intake System ◽  
Pump Station

The correct operation of vertical centrifugal pumps is strongly dependent on the design of the entire pump intake system, which includes the suction sump and the associated piping. From the hydraulic point of view, the sump or pump intake design is one of the most critical aspect the designer is facing with: an incorrect sump dimensioning can determine the onset of detrimental fluid dynamic phenomena like pulsation, cavitation and a vortical activity which can easily lead to the appearance of undesired vibration of the entire pump structure. Basic guidelines for the sump and the intake pipeline design have been well established over the years and are now widely published. They include recommendations for the definition of the main sump dimensions, together with the minimum submergence as well as recommended typical velocities approaching the pump suction bell. When shape and dimensions are not standard, it is very often required to perform an experimental investigation of the sump characteristics with a scaled model to evaluate the hydraulic behavior of the intake system and, if necessary, provide indications for changes in the system layout to meet the required criteria. In the recent years, CFD has become a well established tool for the design validation of all pumps components. Nevertheless, numerical simulation applied to intake systems has not yet received the deserved attention, most probably due to the massive computational resources required for the modelization of complex intake structures. With the more extensive availability of powerful computers and advanced computational codes, this is not anymore an obstacle. In this respect, the numerical simulation can be seen as a realistic and more economical alternative to model testing. The paper presents an application of the CFD analysis to the hydraulic evaluation of a pump station intake. In the absence of a model test and thanks to a not complex geometry of the sump under investigation, the numerical results can be easily compared to the expected results obtained with the more traditional methods (i.e. Hydraulic Institute) for a basic validation of the numerical simulation. Eventually, the exercise claims to be a contribution to the rising debate on the applicability of numerical simulation to this kind of applications.

Effect of vaned diffuser clocking position on hydraulic performance and pressure pulsation of centrifugal pump

2020 ◽  
pp. 095765092096724
Author(s):  
Hongyu Guan ◽  
Wei Jiang ◽  
Yuchuan Wang ◽  
Gaoyang Hou ◽  
Xiangyuan Zhu ◽  
...  
Keyword(s):  
Energy Loss ◽  
Centrifugal Pump ◽  
Pressure Pulsation ◽  
Guide Vane ◽  
Hydraulic Performance ◽  
Design Flow ◽  
Maximum Difference ◽  
Centrifugal Pumps ◽  
Vaned Diffuser ◽  
Diffuser Flow

The clocking position of the vaned diffuser, the circumferential position of the vaned diffuser relative to the volute, has a certain effect on the performance of the centrifugal pump. Therefore, this paper studies the guide vane centrifugal pump from the aspects of pressure pulsation, hydraulic performance, and energy loss. The maximum difference in efficiency is 3.4% under the design flow rate, and the maximum difference in the head coefficient is 4.7%. The hydraulic performance and pressure pulsation present different trends with the increase of the vaned diffuser clock angle. When the hydraulic performance and pressure pulsation are relatively good, the circumferential distance between the tongue and the upstream vaned diffuser blade is 3/4 of the diffuser flow path. In addition, the recommended vaned diffuser installation location may also be suitable for centrifugal pumps of similar construction. The energy loss was visualized using the theory of entropy production. The distributions of energy loss and flow field indicate that the energy loss of impeller and vaned diffuser changes little. The change of the vortex in the tongue and outlet area will cause a significant change in the energy loss of the volute, which is the main reason that the hydraulic performance of the centrifugal pump is affected by the clocking position of the vaned diffuser.

Discussion of “Hydraulic Performance Comparison of Centrifugal Pumps”

1965 ◽  
Vol 91 (6) ◽  
pp. 172-184
Author(s):  
Y. R. Reddy ◽  
Subir Kar ◽  
Llewellyn E. Jones ◽  
Ramaprasad ◽  
M. V. Ramamoorthy ◽  
...  
Keyword(s):  
Hydraulic Performance ◽  
Performance Comparison ◽  
Centrifugal Pumps

scholarly journals Hydrodynamic performance and heat generation by centrifugal pumps

Perfusion ◽  
2006 ◽  
Vol 21 (6) ◽  
pp. 373-379 ◽  
Author(s):  
Y Ganushchak ◽  
W van Marken Lichtenbelt ◽  
T van der Nagel ◽  
D S de Jong
Keyword(s):  
Heat Generation ◽  
Negative Pressure ◽  
Hydraulic Performance ◽  
Hydrodynamic Performance ◽  
Flow Mode ◽  
Centrifugal Pumps ◽  
Flow Curves ◽  
Pressure Flow ◽  
Operating Region ◽  
Zero Flow

For over a century, centrifugal pumps (CP) have been used in various applications, from large industrial pumps to flow pumps for aquariums. However, the use of CP as blood pumps has a rather short history. Consequently, the hydraulic performance data for a blood CP are limited. The aim of our investigation was to study the hydraulic performance and the heat generation of three commercially available CP: Bio-Medicus Bio-Pump BP80 (Medtronic), Rotaflow (Jostra Medizintechnik), and DeltaStreamTM DP2 (MEDOS Medizintechnik AQ). The study was performed using a circuit primed with a water-glycerin mixture with a dynamic viscosity of 0.00272 pa/s. Pressure-flow curves were obtained by a stepwise stagnation of the pump outlet or inlet. The temperature changes were observed using ThermaCAM SC2000 (Flir Systems). The pumps’ performance in close to clinical conditions (‘operating region’) was analysed in this report. The ‘operating region’ in the case of the BP80 is positioned around the pressure-flow curve at a pump speed of 3000 rpm. In the case of the Rotaflow, the ‘operating region’ was between the pump pressure-flow curves at a speed of 3000 and 4000 rpm, and the DP2 was found between 7000 and 8000 rpm. The standard deviation of mean pressure through the pump was used to characterise the stability of the pump. In experiments with outlet stagnation, the BP80 demonstrated high negative association between flow and pressure variability (r=-0.68, p <0.001). In experiments with the DP2, this association was positive (r=-0.68, pB <0.001). All pumps demonstrated significantly higher variability of pressure in experiments with inlet stagnation in comparison to the experiments with outlet stagnation. The rise of relative temperature in the inlet of a pump was closely related to the flow rate. The heating of fluid was more pronounced in the ‘zero-flow’ mode, especially in experiments with inlet stagnation. In summary, (1) the ‘zero-flow’ regime, which is described in the manuals of some commercially-available pumps, is the use of the pump outside the allowable operating region. It is potentially dangerous and should, therefore, never be used in clinical settings. (2) Using centrifugal pumps for kinetic-assisted venous return can only be performed safely when the negative pressure at the inlet of the pump is monitored continuously. The maximum allowable negative pressure has to be defined for each type of pump, and must be based on pump performance.

Research on Impeller Blade Style of Stamping and Welding Multistage Centrifugal Pump

2013 ◽  
Vol 655-657 ◽  
pp. 465-469
Author(s):  
Jue Xin Ding ◽  
Shui Hua Zheng
Keyword(s):  
Cfd Simulation ◽  
Great Influence ◽  
Hydraulic Performance ◽  
Centrifugal Pumps ◽  
Impeller Blade ◽  
Curve Design ◽  
Multistage Centrifugal Pump ◽  
Minor Influence ◽  
Design And Manufacture ◽  
Good Support

Impact of vane curve on hydraulic performance of the DQ100-64-22 stamping pump was researched by CFD simulation and experiments. The research results show that processing fillet at the connecting section of space blade and shafts only generates minor influence on the pump performance，but it can decrease incidence losses of the inlet flow. The cylindrical blade type has great influence on both inner flow field and hydraulic performance of pump in the high flow rate conditions. The research can supply a good support for the vane curve design and manufacture of stamping and welding multistage centrifugal pumps.

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