Numerical Simulation and Analysis of Unsteady Flow Characteristics in Centrifugal Pump Volute

2015 ◽  
Vol 51 (22) ◽  
pp. 183
Author(s):  
Genqiqige MENG
Keyword(s):  
Numerical Simulation ◽  
Unsteady Flow ◽  
Centrifugal Pump ◽  
Flow Characteristics

Numerical study on instantaneous radial force of a centrifugal pump for different working conditions

2019 ◽  
Vol 37 (2) ◽  
pp. 458-480
Author(s):  
Xiaoqi Jia ◽  
Sheng Yuan ◽  
Zuchao Zhu ◽  
Baoling Cui
Keyword(s):  
Numerical Simulation ◽  
Unsteady Flow ◽  
Centrifugal Pump ◽  
Working Conditions ◽  
Flow Rate ◽  
Pressure Pulsation ◽  
Radial Force ◽  
Leakage Rate ◽  
Content Type ◽  
Three Components

Purpose Instantaneous radial force induced from unsteady flow will intensify vibration noise of the centrifugal pump, especially under off-design working conditions, which will affect safety reliability of pump operation in severe cases. This paper aims to conduct unsteady numerical computation on one centrifugal pump; thus, unsteady fluid radial force upon the impeller and volute is obtained, so as to study the evolution law of instantaneous radial force, the internal relationship between radial force and pressure pulsation, the relationship among each composition of radial force that the impeller received and the influence of leakage rate of front and back chamber on radial force. Design/methodology/approach The unsteady numerical simulation with SST k-ω turbulence model was carried out for a low specific-speed centrifugal pump using computational fluid dynamics codes FLUENT. The performance tests and pressure tests were conducted by a closed loop system. The performance curves and the pressure distribution from numerical simulation agree with that of the experiment conducted. The unsteady pressure distributions and the instantaneous radial forces induced from unsteady flow were analyzed under different flow rates. Contribution degrees of three components of the radial force on the impeller and the relation between the radial force and leakage rate were analyzed. Findings Radial force on the volute and pressure pulsation on the volute wall have the same distribution tendency, but in contrast to the distribution trend of the radial force on the impeller. In the component of radial force that the impeller received, radial force on the blade accounts for the main position. With the decrease of flow rate, ratio of the radial force on front and back casings will be increased; under large flow rate, vortex and flow blockage at volute section will enhance the pressure and radial force fluctuation greatly, and the pulsation degree may be much more intense than that of a smaller flow rate. Originality/value This paper revealed the relation of the radial force and the pressure pulsation. Meanwhile, contribution degrees of three components of the radial force on the impeller under different working conditions as well as the relation between the radial force and leakage rate of front and rear chambers were analyzed.

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

Numerical simulation of the stalled flow within a vaned centrifugal pump

2004 ◽  
Vol 218 (4) ◽  
pp. 425-435 ◽  
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.

Numerical simulation and analysis of flow characteristics in the front chamber of a centrifugal pump

2017 ◽  
Vol 31 (11) ◽  
pp. 5131-5140 ◽  
Author(s):  
Yang Wu ◽  
Xiaoping Chen ◽  
Hua-Shu Dou ◽  
Lulu Zheng ◽  
Zuchao Zhu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Centrifugal Pump ◽  
Flow Characteristics

Unsteady flow characteristics in centrifugal pump based on proper orthogonal decomposition method

2021 ◽  
Vol 33 (7) ◽  
pp. 075122
Author(s):  
Zhengchuan Zhang ◽  
Hongxun Chen ◽  
Junlian Yin ◽  
Zheng Ma ◽  
Qi Gu ◽  
...  
Keyword(s):  
Unsteady Flow ◽  
Proper Orthogonal Decomposition ◽  
Centrifugal Pump ◽  
Decomposition Method ◽  
Flow Characteristics ◽  
Orthogonal Decomposition ◽  
Proper Orthogonal

Unsteady flow characteristics of energy conversion in impeller of centrifugal pump as turbine

2021 ◽  
pp. 095440622110207
Author(s):  
Senchun Miao ◽  
Hongbiao Zhang ◽  
Jiawei Zhang ◽  
Xiaohui Wang ◽  
Fengxia Shi
Keyword(s):  
Unsteady Flow ◽  
Energy Conversion ◽  
Centrifugal Pump ◽  
Time Domain ◽  
Power Loss ◽  
Flow Characteristics ◽  
Internal Flow ◽  
Input Power ◽  
Impeller Blade ◽  
The Time Domain

To study unsteady flow characteristics of energy conversion in impeller of centrifugal pump as turbine (PAT), the overall and sub-section methods are used to calculate the unsteady flow of the PAT under six working conditions. Through numerical calculations, the net input power of the impeller, the time domain change law of the fluid's work on the impeller, the time domain change law of power loss in the impeller, and the time domain change law of energy conversion in different regions of the impeller are analyzed. Results show that: the dynamic and static interference between the impeller blades and the tongue caused the fluctuation of energy conversion; with the increase of area between the head of the impeller blade and the opposite tongue, the power loss in the impeller decreases. And when the blade head completely deviates from the position of the tongue about 10°, the power loss in the impeller is minimized. The power output of the PAT at different flow rates is related to its internal flow conditions and the geometric structure of each region of the impeller. The above research results can provide guidance on how to operate the PAT impeller stably and efficiently.

Numerical simulation of unsteady flow characteristics in a spool valve

2004 ◽  
Vol 2004.41 (0) ◽  
pp. 81-82
Author(s):  
Hisanori UENO ◽  
Yoshio MATSUI ◽  
Masato HASEGAWA ◽  
Yasuaki NAKANO
Keyword(s):  
Numerical Simulation ◽  
Unsteady Flow ◽  
Flow Characteristics ◽  
Spool Valve
Sign in / Sign up

Export Citation Format

Share Document