scholarly journals Comparative Analysis of Strength and Modal Characteristics of a Full Tubular Pump and an Axial flow Pump Impellers Based on Fluid-Structure Interaction

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6395
Author(s):  
Lijian Shi ◽  
Jun Zhu ◽  
Li Wang ◽  
Shiji Chu ◽  
Fangping Tang ◽  
...  
Keyword(s):  
Equivalent Stress ◽  
Fluid Structure Interaction ◽  
Axial Flow ◽  
Total Deformation ◽  
Stress Concentrations ◽  
Pump Impeller ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Axial Flow Pump ◽  
Flow Pump

Fluid-structure interaction (FSI) was used to determine the structural mechanical characteristics of full tubular and axial-flow pumps. The results showed that as the flow rate increases, the total deformation and equivalent stress are significantly reduced. The max total deformation (MTD) and the max equivalent stress (MES) of the full tubular pump impeller occur on the outer edge of the blade. There are two stress concentrations in the full tubular pump impeller, one of which is located in the outlet area of the rim, and the other is located in the outlet area of the hub. However, the MES of the axial-flow pump appears in the center of the blade hub. The performance difference between the full tubular pump and the axial-flow pump is mainly caused by the clearance backflow. The natural frequency of the full tubular pump is lower than that of the axial-flow pump on the basis of the modal results. The MES of the full tubular pump is mainly concentrated at the junction of the blade and the motor rotor, and the max thickness of the rim is 6mm, which can be more prone to cracks and seriously affect the safety and stability of the pump.

Analysis of Strength and Modal Characteristics of a Full Tubular Pump Impeller Based on Fluid-Structure Interaction

2021 ◽  
Author(s):  
Lijian Shi ◽  
Jun Zhu ◽  
Li Wang ◽  
Shiji Chu ◽  
FangPing Tang ◽  
...  
Keyword(s):  
Equivalent Stress ◽  
Fluid Structure Interaction ◽  
Axial Flow ◽  
Total Deformation ◽  
Stress Concentrations ◽  
Pump Impeller ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Axial Flow Pump ◽  
Flow Pump

Abstract FSI(Fluid-Structure Interaction) is used to perform the the structural mechanical characteristics on the full tubular and the axial-flow pumps. The results show that as the flow rate increases, the total deformation and equivalent stress are significantly reduced. The MTD(max total deformation) and the MES(max equivalent stress) of the full tubular pump impeller appear at the outer edge of the blade. There are two stress concentrations in the full tubular pump impeller, in which one is located in the outlet area of the rim, and the other is located in the outlet area of the hub. However, the MES of the axial-flow pump appears at the center of the blade hub. The performance difference between the full tubular pump and the axial-flow pump is mainly caused by the clearance backflow. The natural frequency of the full tubular pump is lower than that of the axial-flow pump according to the modal results. The MES of the full tubular pump is mainly concentrated at the junction of the blade and the motor rotor, and the max thickness of the rim is 6mm, which is more prone to cracks, seriously affecting the safety and stability of the pump.

scholarly journals Study into the Improvement of Dynamic Stress Characteristics and Prototype Test of an Impeller Blade of an Axial-Flow Pump Based on Bidirectional Fluid–Structure Interaction

2019 ◽  
Vol 9 (17) ◽  
pp. 3601 ◽  
Author(s):  
Kan Kan ◽  
Yuan Zheng ◽  
Huixiang Chen ◽  
Jianping Cheng ◽  
Jinjin Gao ◽  
...  
Keyword(s):  
Finite Element ◽  
Dynamic Stress ◽  
Fluid Structure Interaction ◽  
Axial Flow ◽  
Gravity Effect ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Prototype Test ◽  
Axial Flow Pump ◽  
Flow Pump

This paper performed a numerical study into the dynamic stress improvement of an axial-flow pump and validated the simulation results with a prototype test. To further analyze the dynamic stress characteristics of impeller blades of axial-flow pumps, a bidirectional fluid–structure interaction (FSI) was applied to numerical simulations of the unsteady three-dimensional (3-D) flow field of the whole flow system of an axial-flow pump, and the gravity effect was also taken into account. In addition, real-structure-based single-blade finite element model was established. By using the finite element method, a calculation of the blade’s dynamic characteristics was conducted, and its dynamic stress distribution was determined based on the fourth strength theory. The numerical results were consistent with the prototype tests. In a rotation cycle, the dynamic stress of the blade showed a tendency of first increasing, and then decreasing, where the maximum value appeared in the third quadrant and the minimum appeared in the first quadrant in view of the gravity effect. A method for reducing the stress concentration near the root of impeller blades was presented, which would effectively alleviate the possibility of cracking in the unreliable region of blades. Simultaneously, an experimental method for the underwater measurement of the dynamic stress of prototypical hydraulic machinery was put forward, which could realize the underwater sealing of data acquisition instruments on rotating machinery and the offline collection of measured data, finally effectively measuring the stress of underwater moving objects.

Fluid-structure interaction study of a mixed-flow pump impeller during startup

2018 ◽  
Vol 35 (1) ◽  
pp. 18-34 ◽  
Author(s):  
Wei Li ◽  
Leilei Ji ◽  
Weidong Shi ◽  
Ling Zhou ◽  
Xiaoping Jiang ◽  
...  
Keyword(s):  
Fluid Structure Interaction ◽  
Interaction Study ◽  
Mixed Flow ◽  
Pump Impeller ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Flow Pump

scholarly journals Fluid–structure interaction analysis of fluid pressure pulsation and structural vibration features in a vertical axial pump

2019 ◽  
Vol 11 (3) ◽  
pp. 168781401982858
Author(s):  
Liaojun Zhang ◽  
Shuo Wang ◽  
Guojiang Yin ◽  
Chaonian Guan
Keyword(s):  
Pressure Pulsation ◽  
Interaction Analysis ◽  
Equivalent Stress ◽  
Fluid Structure Interaction ◽  
Fluid Pressure ◽  
Structural Vibration ◽  
Interaction Method ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Axial Pump

Current studies on the operation of the axial pump mainly focus on hydraulic performances, while the coupled interaction between the fluid and structure attracts little attention. This study aims to provide numerical investigation into the vibration features in a vertical axial pump based on two-way iterative fluid–structure interaction method. Three-dimensional coupling model was established with high-quality structured grids of ADINA software. Turbulent flow features were studied under design condition, using shear–stress transport k-ω turbulence model and sliding mesh approach. Typical measure points along and perpendicular to flow direction in fluid domain were selected to analyze pressure pulsation features of the impeller and fixed guide vane. By contrast, vibration features of equivalent stress in corresponding structural positions were investigated and compared based on fluid–structure interaction method. In order to explore fluid–structure interaction vibration mechanism, distribution of main frequencies and amplitudes of the measure points was presented based on the Fast Fourier Transformation method. The results reveal the time and frequency law of fluid pressure pulsation and structural vibration at the same position in the vertical axial pump while additionally provide important theoretical guidance for optimization design and safe operation of the vertical axial pump.

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