Study on Internal Flow and External Performance of a Semi-open Impeller Centrifugal Pump with Different Tip Clearances

AbstractTo study the influence of tip clearance on internal flow characteristics and external performance of a prototype centrifugal pump with a semi-open impeller, the unsteady numerical simulation and performance experiments are carried out in this paper. The evolution process of leakage vortex with time

Download Full-text

Study and Investigation on the Mach of Impeller Outlet and Diffuser Inlet in Stamping and Welding Centrifugal Pump

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.229-231.2454 ◽

2012 ◽

Vol 229-231 ◽

pp. 2454-2458

Author(s):

Jian Jun Gan ◽

Jie Gang Mou ◽

Shui Hua Zheng ◽

Bo Zhu

Keyword(s):

Centrifugal Pump ◽

Experimental Research ◽

Static Pressure ◽

Flow Characteristics ◽

Internal Flow ◽

Area Ratio ◽

Cfd Simulations ◽

Impeller Outlet ◽

And Performance

Based on CFD simulations and experimental research, this paper studied the mach of impeller outlet and diffuser inlet in stamping and welding centrifugal pump. The influence of area ratio Y of impeller outlet to diffuser inlet on pump internal flow characteristics and performance was studied. Five different area ratio pump models were analyzed. The results indicate that as the area ratio Y= F3/F2 increase, the velocity of fluid in diffuser inlet decreases continuously, the average static pressure of diffuser outlet increases, and the head and efficiency of the pump are risen. When the area ratio increases from Y=1.48 to Y=3.49, the head increases about 3.0% and the efficiency about 2.0%.

Download Full-text

Numerical Simulation on Effect of Volute Width on Performance of a Centrifugal Fan

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.538-541.686 ◽

2012 ◽

Vol 538-541 ◽

pp. 686-689

Author(s):

Yu Kun Lv ◽

Bao Jun Song ◽

Tong Chang Lu

Keyword(s):

Numerical Simulation ◽

Flow Characteristics ◽

Internal Flow ◽

Design Flow ◽

Centrifugal Fan ◽

Contrastive Analysis ◽

Optimization Principle ◽

And Performance ◽

Performance Results ◽

Full Pressure

Taking the G4-73№8D centrifugal fan as research object and utilizing the software of NUMECA to simulate flow fields of volute with different widths, the parameters of width are optimized through contrastive analysis of the effects on internal flow characteristics and performance. Results show that the optimized scheme can improve the uniformity of internal flow field, full pressure and efficiency seperatly increase by 0.52% and 0.48% under the design flow. For the needs of variable fan load operation, this paper puts forward the optimization principle of width parameter.

Download Full-text

Numerical Simulation on G4-73 Centrifugal Fan with Slotted Blades

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.516-517.960 ◽

2012 ◽

Vol 516-517 ◽

pp. 960-965

Author(s):

Yu Kun Lv ◽

Yan Qi Li ◽

Xin Peng ◽

Bao Jun Song

Keyword(s):

Numerical Simulation ◽

Flow Characteristics ◽

Internal Flow ◽

Design Flow ◽

Centrifugal Fan ◽

Contrastive Analysis ◽

Optimization Principle ◽

And Performance ◽

Performance Results ◽

Full Pressure

Taking the G4-73№8D centrifugal fan as research object and utilizing the software of NUMECA to simulate flow fields of impellers with different splotted blades, the parameters of slotted blade are optimized through contrastive analysis of the effects on internal flow characteristics and performance. Results show that the optimized scheme can improve the uniformity of internal flow field, full pressure and efficiency seperatly increase by 4.25% and 1.49% under the design flow. For the needs of variable fan load operation, this paper puts forward the optimization principle of slit parameter.

Download Full-text

Optimal Design of Slit Impeller for Low Specific Speed Centrifugal Pump Based on Orthogonal Test

Journal of Marine Science and Engineering ◽

10.3390/jmse9020121 ◽

2021 ◽

Vol 9 (2) ◽

pp. 121

Author(s):

Yang Yang ◽

Ling Zhou ◽

Hongtao Zhou ◽

Wanning Lv ◽

Jian Wang ◽

...

Keyword(s):

Numerical Simulation ◽

Centrifugal Pump ◽

Large Scale ◽

Internal Flow ◽

Orthogonal Test ◽

Centrifugal Pumps ◽

Initial Model ◽

Low Specific Speed ◽

Specific Speed ◽

Four Levels

Marine centrifugal pumps are mostly used on board ship, for transferring liquid from one point to another. Based on the combination of orthogonal testing and numerical simulation, this paper optimizes the structure of a drainage trough for a typical low-specific speed centrifugal pump, determines the priority of the various geometric factors of the drainage trough on the pump performance, and obtains the optimal impeller drainage trough scheme. The influence of drainage tank structure on the internal flow of a low-specific speed centrifugal pump is also analyzed. First, based on the experimental validation of the initial model, it is determined that the numerical simulation method used in this paper is highly accurate in predicting the performance of low-specific speed centrifugal pumps. Secondly, based on the three factors and four levels of the impeller drainage trough in the orthogonal test, the orthogonal test plan is determined and the orthogonal test results are analyzed. This work found that slit diameter and slit width have a large impact on the performance of low-specific speed centrifugal pumps, while long and short vane lap lengths have less impact. Finally, we compared the internal flow distribution between the initial model and the optimized model, and found that the slit structure could effectively reduce the pressure difference between the suction side and the pressure side of the blade. By weakening the large-scale vortex in the flow path and reducing the hydraulic losses, the drainage trough impellers obtained based on orthogonal tests can significantly improve the hydraulic efficiency of low-specific speed centrifugal pumps.

Download Full-text

Numerical simulation and performance analysis of a four-stage centrifugal pump

Advances in Mechanical Engineering ◽

10.1177/1687814016673756 ◽

2016 ◽

Vol 8 (10) ◽

pp. 168781401667375 ◽

Cited By ~ 4

Author(s):

Wei Li ◽

Xiaoping Jiang ◽

Qinglong Pang ◽

Ling Zhou ◽

Wei Wang

Keyword(s):

Numerical Simulation ◽

Performance Analysis ◽

Centrifugal Pump ◽

And Performance

Download Full-text

Numerical Study on the Influence of Inlet Guide Vanes on the Internal Flow Characteristics of Centrifugal Pump

Processes ◽

10.3390/pr8010122 ◽

2020 ◽

Vol 8 (1) ◽

pp. 122 ◽

Cited By ~ 3

Author(s):

Peifeng Lin ◽

Yongzheng Li ◽

Wenbin Xu ◽

Hui Chen ◽

Zuchao Zhu

Keyword(s):

Centrifugal Pump ◽

Numerical Study ◽

Flow Characteristics ◽

Internal Flow ◽

Low Flow ◽

Hydraulic Loss ◽

Inlet Pipe ◽

Monitoring Point ◽

Guide Vanes ◽

Sst Turbulence Model

In order to make the centrifugal pump run efficiently and stably under various working conditions, the influences of the incoming vortex flow in the inlet pipe on the main flow in the impeller is studied numerically, based on the k − ω SST turbulence model. Some guide vanes with different offset angle were added to change the statistical characteristic of the internal flow in the inlet pipe of the centrifugal pump. Both contour distributions of internal flow and statistical results of external performance are obtained and analyzed. The results show that the existence of vanes can divide the large vortex because of the reversed flow from the rotating impeller at low flow rate conditions into small vortices, which are easier to dissipate, make the velocity and pressure distribution more uniform, improve the stability of the flow in the impeller, reduce the hydraulic loss, and improve the hydraulic performance of the pump. The pump with vanes of offset angle 25° has a small pressure pulsation amplitude at each monitoring point. Comparing with the performance of the original pump, the head increased by around 2% and efficiency increased by around 2.5% of the pump with vanes of offset angle 25°.

Download Full-text

Numerical simulation of the stalled flow within a vaned centrifugal pump

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/095440620421800407 ◽

2004 ◽

Vol 218 (4) ◽

pp. 425-435 ◽

Cited By ~ 23

Author(s):

K M Guleren ◽

A Pinarbasi

Keyword(s):

Numerical Simulation ◽

Centrifugal Pump ◽

High Speed ◽

Stokes Equations ◽

Reverse Flow ◽

Flow Characteristics ◽

Navier Stokes ◽

Leakage Flow ◽

Navier Stokes Equations ◽

Low Pass

The main goal of the present work is to analyse the numerical simulation of a centrifugal pump by solving Navier-Stokes equations, coupled with the ‘standard k-∊’ turbulence model. The pump consists of an impeller having five curved blades with nine diffuser vanes. The shaft rotates at 890r/min. Flow characteristics are assumed to be stalled in the appropriate region of flowrate levels of 1.31-2.861/s. Numerical analysis techniques are performed on a commercial FLUENT package program assuming steady, incompressible flow conditions with decreasing flowrate. Under stall conditions the flow in the diffuser passage alternates between outward jetting when the low-pass-filtered pressure is high to a reverse flow when the filtered pressure is low. Being below design conditions, there is a consistent high-speed leakage flow in the gap between the impeller and the diffuser from the exit side of the diffuser to the beginning of the volute. Separation of this leakage flow from the diffuser vane causes the onset of stall. As the flowrate decreases both the magnitude of the leakage within the vaneless part of the pump and reverse flow within a stalled diffuser passage increase. As this occurs, the stall-cell size extends from one to two diffuser passages. Comparisons are made with experimental data and show good agreement.

Download Full-text

The Research on Numerical Simulation of the Centrifugal Pump and Configuration Perfected

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.694-697.56 ◽

2013 ◽

Vol 694-697 ◽

pp. 56-60

Author(s):

Yue Jun Ma ◽

Ji Tao Zhao ◽

Yu Min Yang

Keyword(s):

Numerical Simulation ◽

Centrifugal Pump ◽

Unstructured Grid ◽

Stokes Equations ◽

Three Dimensional ◽

Internal Flow ◽

Navier Stokes ◽

Navier Stokes Equations ◽

Flow Phenomena ◽

Simplec Algorithm

In the paper, on the basis of three-dimensional Reynolds-averaged Navier-Stokes equations and the RNG κ-ε turbulence model, adopting Three-dimensional unstructured grid and pressure connection the implicit correction SIMPLEC algorithm, and using MRF model which is supported by Fluent, this paper carries out numerical simulation of the internal flow of the centrifugal pump in different operation points. According to the results of numerical simulation, this paper analyzes the bad flow phenomena of the centrifugal pump, and puts forward suggests about configuration perfected of the centrifugal pump. In addition, this paper is also predicted the experimental value of the centrifugal pump performance, which is corresponding well with the measured value.

Download Full-text