Numerical investigation and experiment on pressure pulsation characteristics in a full tubular pump

Shi, Lijian; Yuan, Ye; Jiao, Haifeng; Tang, Fen; Cheng, Li; Yang, Fan; Jin, Yan; Zhu, Jie

doi:10.1016/j.renene.2020.09.003

Cited by 50 publications

(32 citation statements)

References 18 publications

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“…Axial-flow pumps are characterized by a low head and large flow, and they mainly rely on the rotation of impellers to convert the work into the kinetic energy and pressure energy of water. ese pumps are widely used in the East Route Project of the South-to-North Water Diversion in China and they play an important role in agricultural irrigation, urban water supply, and drainage [1][2][3][4][5][6]. At present, large-scale pump station projects generally adopt fully adjustable impellers.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Experiment of the Effects of Blade Angle Deviation on the Hydraulic Characteristics and Pressure Pulsation of an Axial‐Flow Pump

Shi

Zhu

Yuan

et al. 2021

Shock and Vibration

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Inadequate blade angle adjustment or manufacturing errors will cause inconsistencies in the blade angle of an axial-flow pump. In this study, the hydrodynamic characteristics of an axial-flow pump with inconsistent blade angle are investigated by analyzing hydraulic performance and pressure pulsation. The analysis is conducted by performing a numerical simulation combined with a model test. Results show that, relative to the case without blade angle deviation, the case with blade angle deviation exhibits changes in the periodicity of the flow field in the impeller. Such changes result in uneven pressure changes in the impeller passage. The pressure pulsation induced by the blade angle deviation is mainly low-frequency pulsation; that is, it is twice the rotation frequency. The amplitude of the main frequency pulsation is 1.5–3 times that of the blade without angle deviation. This low frequency that dominates the whole pump device easily causes the vibration and weakens the safety and stability of the pump. The blade angle deviation exerts great influence on the unsteady characteristics. Hence, blade angle deviation seriously affects the safe and stable operation of axial-flow pumps and pump stations.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Experiment of the Effects of Blade Angle Deviation on the Hydraulic Characteristics and Pressure Pulsation of an Axial‐Flow Pump

Shi

Zhu

Yuan

et al. 2021

Shock and Vibration

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“…At present, there is a few studies on the backflow clearance in the full tubular pump. Shi [4,5] compared the hydraulic characteristics and pressure characteristics of a full tubular pump and traditional axial flow pump. The results shown that the hydraulic performance of the full tubular pump is lower than the traditional axial flow pump, but the pressure pulsation amplitude of the full tubular pump is smaller than that of the traditional axial flow pump under the design and over-load condition.…”

Section: Introductionmentioning

confidence: 99%

Energy Characteristics of Full Tubular Pump Device with Different Backflow Clearances Based on Entropy Production

Meng

Pei

2021

Applied Sciences

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In this study, the entropy theory was used as the evaluation standard of energy dissipation, and the effect of backflow clearance (the gap between motor rotor and motor shell) on energy characteristics of a full tubular pump was investigated by 3D unsteady flow simulation. The calculated results validated through testing shows that backflow clearance produces additional head loss and the rotation of the motor rotor requires more shaft power. The additional energy losses lead to a significant decline in the efficiency of tubular pump device. Under design conditions, the total dissipation of backflow clearance, rear guide vane, and outlet passage decreases with the increase of clearance radius, but that of the impeller decreases first and then rises with the increase of clearance radius. In addition, the increase of the clearance radius leads to disorderly flow pattern in the impeller. The total dissipation rate on the impeller suction side and near the impeller inlet increases with the increase of backflow clearance radius, but that on the impeller suction side decreases with the increase of backflow clearance radius. The total dissipation rate of the suction side of the guide vane and the wall of the outlet passage decreases with the increase of backflow clearance radius. This work can provide an intuitive analysis of the energy dissipation caused by backflow clearance and reference for engineering applications of full tubular pump.

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“…However, the efficiency of the full tubular pump impeller is generally lower than that of the axial-flow pump. Shi et al [2][3][4] combined numerical simulation and model tests to evaluate the hydraulic performance of axial-flow and full tubular pumps. After analyzing the characteristics of energy performance and pressure pulsation they concluded that the clearance backflow had a greater impact on the hydraulic performance of the full tubular pump.…”

Section: Introductionmentioning

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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Numerical investigation and experiment on pressure pulsation characteristics in a full tubular pump

Cited by 50 publications

References 18 publications

Numerical Simulation and Experiment of the Effects of Blade Angle Deviation on the Hydraulic Characteristics and Pressure Pulsation of an Axial‐Flow Pump

Numerical Simulation and Experiment of the Effects of Blade Angle Deviation on the Hydraulic Characteristics and Pressure Pulsation of an Axial‐Flow Pump

Energy Characteristics of Full Tubular Pump Device with Different Backflow Clearances Based on Entropy Production

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

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