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.

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 About Finite Element Analysis of Fluid – Structure Interaction Problems

2014 ◽  
Vol 91 ◽  
pp. 37-42 ◽  
Author(s):  
Alexander M. Belostosky ◽  
Pavel A. Akimov ◽  
Taymuraz B. Kaytukov ◽  
Irina N. Afanasyeva ◽  
Anton R. Usmanov ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fluid Structure Interaction ◽  
Element Analysis ◽  
Fluid Structure ◽  
Structure Interaction
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