Numerical Simulation of the Internal Flow Stability in a Centrifugal Pump with High Specific Speed at Partial Load

2021 ◽  
Author(s):  
Jianyuan Lv ◽  
Wenqian Xu ◽  
Haiyan Yin ◽  
Yuliang Zhang ◽  
Hua-Shu Dou
Keyword(s):  
Numerical Simulation ◽  
Centrifugal Pump ◽  
Internal Flow ◽  
Flow Stability ◽  
Partial Load ◽  
Specific Speed

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

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.

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

2015 ◽  
Vol 32 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Xiao-Qi Jia ◽  
Bao-Ling Cui ◽  
Yu-Liang Zhang ◽  
Zu-Chao Zhu
Keyword(s):  
Numerical Simulation ◽  
Centrifugal Pump ◽  
Flow Characteristics ◽  
Internal Flow ◽  
Tip Clearance ◽  
Evolution Process ◽  
And Performance ◽  
Unsteady Numerical Simulation

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

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

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.

2432 Internal Flow Analysis of Low Specific Speed Centrifugal Pump with Circular Casing

2006 ◽  
Vol 2006.2 (0) ◽  
pp. 183-184
Author(s):  
Jun MATSUI ◽  
Junichi KUROKAWA ◽  
Kouichi NISHINO ◽  
Young-Do Choi ◽  
Kouichi MOURI
Keyword(s):  
Centrifugal Pump ◽  
Flow Analysis ◽  
Internal Flow ◽  
Low Specific Speed ◽  
Specific Speed

Numerical Simulation of Hysteresis on Head/Discharge Characteristics of a Centrifugal Pump

2003 ◽  
Author(s):  
Masamichi Iino ◽  
Kazuhiro Tanaka ◽  
Kazuyoshi Miyagawa ◽  
Takeshi Okubo
Keyword(s):  
Numerical Simulation ◽  
Hysteresis Loop ◽  
Centrifugal Pump ◽  
Characteristic Curve ◽  
Swirl Flow ◽  
Centrifugal Pumps ◽  
Pump Impeller ◽  
Discharge Characteristics ◽  
Discharge Characteristic ◽  
Partial Load

The objectives of the present study were to investigate influences of fins, set in a suction part, on the positive slope and hysteresis loop in head/discharge characteristic curves of centrifugal pumps in the experiment as well as in the numerical prediction. The fins were located in upstream side of a pump impeller to suppress swirl flow occurring before the impeller inlet at partial load operation. We had two kinds of centrifugal pump with/without the fins, the number of which is 16. These two centrifugal pumps had a shrouded impeller with 7 blades and a diffuser with 20 guide vanes with the same configuration. In the experiment, the pump with them had a large hysteresis loop at partial load operation in the head/discharge characteristic curve, although the pump without them had no hysteresis loop. In the numerical simulation based on periodic flow, the incompressible turbulent flow field was calculated for partial blade-passages with periodic boundary conditions. As a result, the simulated characteristics had the same tendencies as the experimental results. Furthermore, the causes of the discontinuous head/discharge characteristics depending on the direction of partial load operation were clarified through calculating and comparing the internal flow fields in the cases with/without the fins. The pumps had the large backflow and recirculation areas in two places, one of which was near the shroud at the impeller inlet including the fins area and another near the central part of the diffuser. The difference in the hysteresis loop between with and without the fins was caused by the existence of the fins, which suppressed or promoted the backflow at the impeller.

Analysis on Effects of the Blade Wrap Angle and Outlet Angle on the Performance of the Low-Specific Speed Centrifugal Pump

2011 ◽  
Vol 354-355 ◽  
pp. 615-620 ◽  
Author(s):  
Wei Li ◽  
Wei Dong Shi ◽  
Ting Jiang ◽  
Yan Xu ◽  
Tong Tong Li
Keyword(s):  
Centrifugal Pump ◽  
Stokes Equations ◽  
Internal Flow ◽  
Navier Stokes ◽  
Outlet Angle ◽  
Study Results ◽  
Wrap Angle ◽  
Low Specific Speed ◽  
Specific Speed ◽  
Blade Wrap Angle

In order to research the effect of the blade wrap angle and outlet angle on the hydraulic performance of the low-specific speed sewage pump, the Reynolds time-averaged Navier-Stokes equations was discretized based on the finite volume method, and the modified k-ε turbulence model were chosen in FLUENT. Numerical simulation of the internal flow within the centrifugal pump with the specific speed of 60 at different blade wrap angle and outlet angle is carried out. The analysis of the velocity and the turbulent kinetic energy distribution in different cases, and predicts the external characteristics of the several cases based on the loss analysis method. The study results show that the efficiency of pumps increase with decreasing the outlet angle and increasing the wrapping angle at the design of sewage pumps. According to the analysis, changing the blade outlet Angle has much more influence on the performance of the pump than changing the wrap angle.

A Study on the Internal Flow Characteristics of a Very Low Specific Speed Centrifugal Pump by PTV

2006 ◽  
Vol 9 (1) ◽  
pp. 9-18
Author(s):  
Young-Do Choi ◽  
Jun Matsui ◽  
Junichi Kurokawa ◽  
Young-Ho Lee
Keyword(s):  
Centrifugal Pump ◽  
Flow Characteristics ◽  
Internal Flow ◽  
Low Specific Speed ◽  
Specific Speed

Examine Applicability of the RANS and LES Method on Numerical Simulation of Centrifugal Pump

2011 ◽  
Vol 55-57 ◽  
pp. 582-586
Author(s):  
Shu Jia Zhang ◽  
Yue Ping Tong ◽  
Le Hu
Keyword(s):  
Numerical Simulation ◽  
Large Eddy Simulation ◽  
Centrifugal Pump ◽  
Power Efficiency ◽  
Internal Flow ◽  
Equation Model ◽  
Eddy Simulation ◽  
Simulated Performance ◽  
Large Eddy ◽  
Performance Curves

In order to examine applicability of the Reynolds-Averaged Navier-Stokes （RANS）using Reynolds Stress equation Model (RSM) and the Large Eddy Simulation (LES) in numerical simulation of centrifugal pump, a series of 3D numerical simulation at the design point and at six off-design points were carried out with the two methods. The object is based on IS80-65-160 centrifugal pump. According to the results obtained, head, shaft power, efficiency of pump were calculated, the simulated performance curves of a centrifugal pump is processed. The simulated performance curves of a centrifugal pump were compared with the experimental performance curves. It was confirmed that RANS were suitable for the numerical simulation of the internal flow inside a centrifugal pump. But the result of LES is not very good if the same gambit which is suitable for RANS was used. Therefore, the computer resources, not propose the Large Eddy Simulation (LES) method in numerical simulations of centrifugal pump.

Sign in / Sign up

Export Citation Format

Share Document