Stress Characteristics Analysis of Vertical Bi-Directional Flow Channel Axial Pump Blades Based on Fluid–Structure Coupling

Liu, Xinyi; Xu, Fengyang; Cheng, Li; Pan, Weifeng; Jiao, Weixuan

doi:10.3390/machines10050368

Cited by 9 publications

(6 citation statements)

References 8 publications

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“…Concurrently, the temporal evolution of stress manifests a discernible periodic pattern. Simultaneously, scholars have undertaken investigations into the structural attributes of various pump devices, including the bidirectional flow channel axial flow pump device [14], the S-type front axle extended tube pump device [15], and full tube axial flow pump units [16]. Scholars have elucidated the stress and strain distribution in the pump device utilizing fluid-structure coupling methods, providing insights into potential crack locations.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Pressure Pulsation and Structural Characteristics of Vertical Shaft Cross-Flow Pumps

Zhu,

Jiao,

Wang

et al. 2024

Water

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In order to study the pressure pulsation characteristics and structural dynamic response characteristics of a vertical shaft cross-flow pump, this study used a computational fluid dynamics (CFD) numerical simulation method to analyze the pressure pulsation characteristics of the inlet passage, impeller, and guide vane positions of the vertical shaft cross-flow pump device. At the same time, this study analyzed the equivalent stress–strain characteristics of the impeller and guide vane of a vertical shaft cross-flow pump based on fluid structure coupling technology and comprehensively analyzed the deformation modes of the impeller blades and guide vanes under dynamic water flow. This research shows that due to the influence of rotor–stator interaction, the amplitude of pressure pulsation at the interface between the impeller and guide vane of the pump device is the largest and that the main frequency distribution at this position is relatively complex. The non-uniformity of stress distribution at the impeller position gradually decreases with an increase in the radial distance. The high stress and strain zones of the impeller and guide vane are concentrated at the root of the blade. This study can provide reference for hydraulic optimization design and stable operation of similar pump devices.

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Section: Introductionmentioning

confidence: 99%

Analysis of Pressure Pulsation and Structural Characteristics of Vertical Shaft Cross-Flow Pumps

Zhu,

Jiao,

Wang

et al. 2024

Water

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“…The results showed that the maximum deformation occurred at the blade rim, and the deformation gradually decreased along the edge from the leading edge (LE) to the trailing edge (TE). Liu et al [15] analyzed the stress and deformation of the blades of a vertical bi-directional axial-flow pump based on the flow field pressure distribution and found that the stress concentration occurred at the center of the connection between the blade root and the hub and the maximum stress value at stress concentration decreased with increasing flow rate. Shi et al [16] compared the equivalent stress distributions of an axial-flow pump and a full tubular pump and found that the maximum equivalent stress of an axial-flow pump was lower than that of full tubular pump under different flow conditions.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Structural Strength and Fatigue Life of Rotor System of a Vertical Axial-Flow Pump under Full Operating Conditions

Li,

Cai,

Zheng

et al. 2023

Water

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Axial-flow pumps consider both the conventional pump mode and the pump as turbine (PAT) mode operation and put forward higher requirements for long-term operation stability and structural strength; therefore, it is of great engineering significance to evaluate the structural strength and fatigue life of the rotor under full operating conditions. In this study, based on computational fluid dynamics and the one-way fluid-structure interaction algorithm, the structural strength and fatigue life of the rotor system of a large vertical axial-flow pump under full operating conditions were evaluated and studied. The results show that blade deformation and equivalent stress are generally higher in the PAT mode than in the pump mode. The maximum deformation in both modes occurs at the tip of the blade, while the area of stress concentration is at the root of the blade. Both the deformation and the equivalent stress increase with increasing flow rate. The minimum safety factor occurs at the blade root in both modes, and the safety factor in the PAT mode is relatively smaller than that in pump mode. Therefore, when designing and manufacturing axial flow pumps for turbine duties, priority should be given to material strength at the blade root during PAT mode operation to ensure safe and stable operation. The aim of this study is to provide technical references and theoretical foundations for evaluating the service cycle of axial-flow pumps and the influence on pump life under different operation modes.

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“…Chen et al investigated the distortion mechanism of inlet fluid and the energy characteristics of the fluid in a bidirectional axial flow pump and found that the non-uniform inflow of the fluid negatively affected the efficiency and head of the pumping device [11]. This was because of the bidirectional axial flow pump's reverse operation on the structure of the impeller by the influence of the guide vane, showing different hydraulic performance [12,13]. Wang et al investigated the internal flow of a bidirectional axial pump and found that flow separation at the blade tails during reverse operation resulted in performance degradation [14].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Unsteady Internal Flow Characteristics in a Bidirectional Axial Flow Pump

Dai,

Shi,

Yang

et al. 2023

Sustainability

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A bidirectional axial flow pump that utilizes an S-shaped hydrofoil design exhibits low efficiency and hydraulic instability when operated in reverse. In order to understand the unsteady flow characteristics of this bidirectional axial pump under different operating conditions, the SST k–ω turbulence model was applied to carry out a three-dimensional unsteady numerical simulation of the full flow channel of the pump. The reliability of the numerical calculation model was verified by comparing it with the experimental head and efficiency. The pressure pulsation characteristics on the impeller surface and the pump device under different operating conditions and the transient forces on the impeller were analyzed. The results show that the head and efficiency in reverse operation were lower than in forward operation and the flow streamline of the impeller outlet area was more turbulent in the reverse operation condition. The monitoring points at the inlet and the top of the impeller surface showed the largest pressure pulsation amplitude. The radial and axial forces on the impeller in the reverse operation were greater than those in the forward operation. Under a reverse 1.0 Qdes condition, the average pressure pulsation amplitudes at the inlet of the impeller were 19.2 times and 5.7 times of that at the inlet of the guide vane and the outlet of the impeller, respectively. This study provides a reference for the hydraulic design and optimization of bidirectional axial flow pumps.

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Stress Characteristics Analysis of Vertical Bi-Directional Flow Channel Axial Pump Blades Based on Fluid–Structure Coupling

Cited by 9 publications

References 8 publications

Analysis of Pressure Pulsation and Structural Characteristics of Vertical Shaft Cross-Flow Pumps

Analysis of Pressure Pulsation and Structural Characteristics of Vertical Shaft Cross-Flow Pumps

Investigation of Structural Strength and Fatigue Life of Rotor System of a Vertical Axial-Flow Pump under Full Operating Conditions

Numerical Analysis of Unsteady Internal Flow Characteristics in a Bidirectional Axial Flow Pump

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