Wet Modal Analyses of Various Length Coaxial Sump Pump Rotors with Acoustic‐Solid Coupling

Peng, Guangjie; Zhang, Zhuoran; Liu, Bai

doi:10.1155/2021/8823150

Cited by 5 publications

(3 citation statements)

References 20 publications

(17 reference statements)

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“…Additionally, the increase in rotational speed leads to changes in the water body in the runner region, bearing characteristics, and generator magnetic torque, which also affect the natural frequencies. Compared to the unloaded structure, the natural frequencies of the loaded structure will increase, which we refer to as the stress-stiffening effect [26].…”

Section: Displacement/accelerationmentioning

confidence: 99%

Pulsation Stability Analysis of a Prototype Pump-Turbine during Pump Mode Startup: Field Test Observations and Insights

Xia,

Zhao,

Wang

et al. 2024

Processes

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Pump-turbines experience complex flow phenomena and fluid–structure interactions during transient operations, which can significantly impact their stability and performance. This paper presents a comprehensive field test study of the pump mode startup process for a 150 MW prototype pump-turbine. By analyzing pressure fluctuations, structural vibrations, and their short-time Fourier transform (STFT) results, multiple stages were identified, each exhibiting distinct characteristics. These characteristics were influenced by factors such as runner rotation, free surface sloshing in the draft tube, and rotor–stator interactions. The natural frequencies of the metallic components varied during the speed-up and water-filling stages, potentially due to gyroscopic effects or stress-stiffening phenomena. The opening of the guide vanes and dewatering valve inside the guide vanes significantly altered the amplitude of the rotor–stator interaction frequency, transitioning the vibration behavior from forced to self-excited regimes. Interestingly, the draft tube pressure fluctuations exhibited sloshing frequencies that deviated from existing prediction methods. The substantial phenomena observed in this study can help researchers in the field to deepen the understanding of the complex behavior of pump-turbines during transient operations and identify more meaningful research directions.

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Section: Displacement/accelerationmentioning

confidence: 99%

Pulsation Stability Analysis of a Prototype Pump-Turbine during Pump Mode Startup: Field Test Observations and Insights

Xia,

Zhao,

Wang

et al. 2024

Processes

View full text Add to dashboard Cite

show abstract

“…The modal analysis flowchart is shown in Figure 16. The mode is the natural vibration characteristic of the structural system, and each mode has a specific natural frequency and vibration shape [31][32][33]. The impeller is the main excitation source of hydraulic excitation.…”

Section: Modal Analysismentioning

confidence: 99%

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

Shi

Zhu

Wang³

et al. 2021

Energies

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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.

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“…The mode is the natural vibration characteristic of the structural system, and each mode has a specific natural frequency and vibration shape [24][25][26]. The impeller is the main excitation source of hydraulic excitation.…”

Section: Modal Analysismentioning

confidence: 99%

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

Shi

Zhu

Wang³

et al. 2021

Preprint

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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.

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Wet Modal Analyses of Various Length Coaxial Sump Pump Rotors with Acoustic‐Solid Coupling

Cited by 5 publications

References 20 publications

Pulsation Stability Analysis of a Prototype Pump-Turbine during Pump Mode Startup: Field Test Observations and Insights

Pulsation Stability Analysis of a Prototype Pump-Turbine during Pump Mode Startup: Field Test Observations and Insights

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

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

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