Numerical investigationof clocking effect of impellerson a multistage pump

Tan, Minggao; Lian, Yichao; Wu, Xu; Liu, Houlin

doi:10.1108/ec-09-2018-0413

Cited by 5 publications

(4 citation statements)

References 8 publications

(10 reference statements)

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“…Lai et al [2], in order to investigate the timing effects of centrifugal pumps, based on the k-omega shear stress transport model for 3D numerical calculations, found that the optimum diffuser installation angle is 25 degrees when the total pressure loss and radial force acting on the impeller are the smallest. Tan et al [3] investigated the timing effect of the impeller in a five-stage centrifugal pump and the superposition effect between the pump stages induced by the timing effect and found that the head and efficiency of the pump did not vary much, while the vibration frequency and amplitude varied considerably. Gu et al [4] conducted an investigation of the vane diffuser relative to the circumference of the circular housing at different timing positions, and based on the minimum entropy generation theory of computational fluid dynamics, the flow loss visualization method was used to describe the losses caused by the timing positions.…”

Section: Introductionmentioning

confidence: 99%

Multi-Objective Parameter Optimization of Submersible Well Pumps Based on RBF Neural Network and Particle Swarm Optimization

Liu,

Gao,

Pan

et al. 2023

Applied Sciences

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In order to improve the hydraulic performance of a submersible well pump, steady and transient simulations were carried out based on ANSYS CFX software. The head and efficiency of the submersible well pump under standard operating conditions were taken as the optimization objectives, and the impeller outlet placement angle, outlet width, and vane wrap angle were selected as the optimization variables using the Plackett-Burman experimental design method. The RBF neural network training samples were constructed using the uniform experimental design method to build a hydraulic performance prediction model for the submersible well pump, and a multi-objective particle swarm optimization was used to solve the model and obtain the Pareto optimal solution set. Using the head and efficiency of the initial model as the boundary, the Pareto optimal solution and the corresponding structural parameters are sought. After the optimization, the head of the individual with the better head is increased by about 2.65 m, and the efficiency of the individual with the better efficiency is increased by about 2.3 percentage points compared with that of the initial model. The pressure gradient in the impeller flow channel is more obvious, the work capacity is significantly improved, the vortex area of the spatial guide vane is smaller, the flow line is more regular, and the pressure pulsation amplitude at the inlet and outlet of the impeller and the spatial guide vane is significantly reduced.

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Section: Introductionmentioning

confidence: 99%

Multi-Objective Parameter Optimization of Submersible Well Pumps Based on RBF Neural Network and Particle Swarm Optimization

Liu,

Gao,

Pan

et al. 2023

Applied Sciences

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“…The results show that the clocking effect has a greater impact on the pressure fluctuation in the pump, especially on the pressure fluctuation intensity of the volute. Tan [36] studied the clocking effect of the high head multistage centrifugal pump and found that the clocking effect had a significant impact on the internal pressure and radial force of the pump. However, the influence of clocking effect on the internal flow characteristics of centrifugal pumps at stall conditions is rarely reported.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Stall Characteristics of Centrifugal Pump with Guide Vanes

Huang³

et al. 2022

Water

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Stall usually occurs in the hump area of the head curve, which will block the channel and aggravate the pump vibration. For centrifugal pumps with guide vanes usually have a clocking effect, the stall characteristic at different clocking positions should be focused. In this paper, the flow field of the centrifugal pump under stall conditions is numerically simulated, and the rotor–stator interaction effects of the centrifugal pump under stall conditions are studied. The double-hump characteristic is found in the head curve by using SAS (Scale Adaptive Simulation) model. The hump area close to the optimal working condition is caused by hydraulic loss, while the hump area far away from the optimal working condition point is caused by the combined action of Euler’s head and hydraulic loss. The SAS model can accurately calculate the wall friction loss, thus predicting the double-hump phenomenon. The pressure fluctuation and head characteristics at different clocking positions under stall conditions are obtained. It is found that when the guide vanes outlet in line with the volute tongue, the corresponding head is the highest, and the pressure fluctuation is the lowest. The mechanism of the clocking effect in the centrifugal pump with guide vanes is obtained by simplifying the hydrofoil. It is found that when the downstream hydrofoil leading edge is always interfered with by the upstream hydrofoil wake, the wake with low energy mixes the boundary layer with low energy, which causes small-pressure pulsation. The results could be used for the operation of centrifugal pumps with guide vanes.

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“…Mojaddam et al 14 optimized the design of the volute for a radial flow compressor, which shows better performance and lower radial force on the impeller. Tan et al 15 investigated clocking effect of impeller in a five-stage centrifugal pump and found that it has little influence in pump head and efficiency, but the influence in pressure fluctuation is larger.…”

Section: Introductionmentioning

confidence: 99%

Analysis of unsteady flow and fluid exciting forces of multistage centrifugal pump based on actual size

Cui

Zhang

Huang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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The unsteady flow and fluid exciting force inside the multistage centrifugal pump were analyzed on the basis of large eddy simulation (LES). The reliability of the numerical simulation was verified by the experimental performance. The performance of pump calculated was closer to the experimental one than that by the Reynolds time average turbulence model, and the errors were 0.36% and 1.14% at the design flow rate, respectively. The results showed that the different distribution and magnitude of the inlet velocity at each stage impeller contributed to the difference of the head for each one. With the increase of flow rates from 0.4Q to 1.2Q, the rule of axial forces for each stage was roughly the same but the total axial force increased from 25.02kN to 29.92kN. The radial force in the Z direction was smaller than the one in the Y direction, and the amplitude of the main frequency in the Z direction changed more gently for the double tongue. Adopting back-to-back impeller distributions can effectively reduce the axial force. The symmetric distributed double tongue can reduce the radial force and play a key role in reducing the vibration of the centrifugal pump.

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Numerical investigationof clocking effect of impellerson a multistage pump

Cited by 5 publications

References 8 publications

Multi-Objective Parameter Optimization of Submersible Well Pumps Based on RBF Neural Network and Particle Swarm Optimization

Multi-Objective Parameter Optimization of Submersible Well Pumps Based on RBF Neural Network and Particle Swarm Optimization

Investigation on Stall Characteristics of Centrifugal Pump with Guide Vanes

Analysis of unsteady flow and fluid exciting forces of multistage centrifugal pump based on actual size

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