scholarly journals Numerical Simulation of 3D Unsteady Flow in Centrifugal Pump by Dynamic Mesh Technique

2013 ◽  
Vol 61 ◽  
pp. 270-275 ◽  
Author(s):  
Huang Si ◽  
Yang Fuxiang ◽  
Guo Jing
Keyword(s):  
Numerical Simulation ◽  
Unsteady Flow ◽  
Centrifugal Pump ◽  
Dynamic Mesh ◽  
Dynamic Mesh Technique ◽  
3D Unsteady Flow ◽  
Mesh Technique

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.

Simulating growth of ash deposit in boiler heat exchanger tube based on CFD dynamic mesh technique

Fuel ◽  
2020 ◽  
Vol 259 ◽  
pp. 116083 ◽  
Author(s):  
Zhimin Zheng ◽  
Wenming Yang ◽  
Peng Yu ◽  
Yongtie Cai ◽  
Hao Zhou ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Dynamic Mesh ◽  
Heat Exchanger Tube ◽  
Dynamic Mesh Technique ◽  
Ash Deposit ◽  
Mesh Technique ◽  
Exchanger Tube

Simulation on Three Dimensional Water-Exit Trajectory of Submarine Launched Missile

2013 ◽  
Vol 791-793 ◽  
pp. 1069-1072 ◽  
Author(s):  
Shao Zhu Wang ◽  
Han Ping Wang ◽  
Ming Yang ◽  
Lin Peng Wang ◽  
Guang Wei Wei
Keyword(s):  
Three Dimensional ◽  
Dynamic Mesh ◽  
Research Focus ◽  
Dynamic Mesh Technique ◽  
Mesh Technique ◽  
Trajectory Characteristic ◽  
Water Exit

Cool Launch project is an important launch mode of submarine launched missile, the water-exit trajectory characteristic of the missile in launching process becomes to research focus. Model of three dimensional water-exit trajectory of submarine launched missile was built based on dynamic mesh technique and simulation operation was carried out to obtain the characteristics of water-exit trajectory & attitude. The method adopted in the establishment of the model and the result has provided references to the research of water-exit trajectory.

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