Research on the effect of wear-ring clearances to the axial and radial force of a centrifugal pump

Zhao, W G; He, Min; Qi, Chen; Li, Y B

doi:10.1088/1757-899x/52/7/072015

Cited by 12 publications

(7 citation statements)

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“…Based on experiment and simulation, the wear ring radial clearance was found to influence the axial thrust. The solutions of hydraulic axial thrust reduction of pumps were then presented [19,20]. In terms of the load-rejection of generating mode, the axial force variation was found to have a strong relationship with flow rate [21].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Starting-Up Axial Hydraulic Force and Structure Characteristics of Pump Turbine in Pump Mode

Mao

Tao

Chen

et al. 2021

JMSE

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During the starting up of the pump mode in pump turbines, the axial hydraulic force acting on the runner would develop with the guide vane opening. It causes deformation and stress on the support bracket, main shaft and runner, which influence the operation security. In this case, the axial hydraulic force of the pump turbine is studied during the starting up of pump mode. Its influences on the support bracket and main shaft are investigated in detail. Based on the prediction results of axial hydraulic force, the starting-up process can be divided into “unsteady region” and “Q flat region” with obviously different features. The mechanism is also discussed by analyzing pressure distributions and streamlines. The deformation of the support bracket and main shaft are found to have a relationship with the resultant force on the crown and band. A deflection is found on the deformation of the runner with the nodal diameter as the midline in the later stages of the starting-up process. The reason is discussed according to pressure distributions. The stress concentration of the support bracket is found on the connection between thrust seating and support plates. The stress of the runner is mainly on the connection between the crown and the blade’s leading-edge. This work will provide more useful information and strong references for similar cases. It will also help in the design of pump turbine units with more stabilized systems for reducing over-loaded hydraulic force, and in the solving of problems related to structural characteristics.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Starting-Up Axial Hydraulic Force and Structure Characteristics of Pump Turbine in Pump Mode

Mao

Tao

Chen

et al. 2021

JMSE

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“…Mou et al 5 simulated the flow in the centrifugal pump with different structure and clearance of wear-ring, and concluded that the change of wear-ring clearance has a significant effect on the internal flow in the centrifugal pump. Zhao et al 6 investigated the effect of wear-ring clearances on the radial and axial force of a centrifugal pump. The results showed that the change of the wear-ring clearance has great influence on the axial force of the centrifugal pump.…”

Section: Introductionmentioning

confidence: 99%

Experiment and simulation about the effect of wear-ring abrasion on the performance of a marine centrifugal pump

Xinlai

Tan

et al. 2021

Advances in Mechanical Engineering

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The wear-ring abrasion can cause performance degradation of the marine centrifugal pump. In order to study the effect of front and back wear-ring clearance on a pump, test and numerical simulation were used to investigate the performance change of a pump. The test results show that the head and efficiency of pump decrease by 3.56% and 9.62% respectively at 1.0 Qd due to the wear-ring abrasion. Under 1.0 Qd, with the increase of the front wear-ring the vibration velocity at pump foot increases from 0.4 mm/s to 1.0 mm/s. The axis passing frequency (APF) at the measuring points increases significantly and there appears new characteristic frequency of 3APF and 4APF. The numerical simulation results show that the front wear-ring abrasion affects the flow at the inlet of the front chamber of the pump and impeller passage. And the back wear-ring abrasion has obvious effect on the flow in the back chamber of the pump and impeller passage, while the multi-malfunction of the front wear-ring abrasion and back wear-ring abrasion has the most obvious effect on the flow velocity and flow stability inside pump. The pressure pulsation at Blade Passing Frequency (BPF) of the three schemes all decrease with the increase of the clearance.

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“…e clocking effect has great influence on the pressure fluctuation and the radial force on the impeller [15]. e front impeller wear ring has great influence on the axial force of the centrifugal pump [16]. e effects of concentric volute and multivolute geometry on the radial force of the centrifugal pump at off-design conditions are investigated, and the triple volute is the most appropriate volute geometry [17].…”

Section: Introductionmentioning

confidence: 99%

Effect of Blade Outlet Angle on Radial Force of Marine Magnetic Drive Pump

Zhang

Kong

Zhu³

et al. 2020

Shock and Vibration

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To research the effects of the blade outlet angle on the performance and the radial force of the marine pump, the unsteady numerical simulation of the four different models is carried out. The radial forces on the impeller and the blades are obtained under different flow rate conditions. The time and frequency domain characteristics of radial resultant force on the impeller and the blades are analyzed and those of the impeller torque are researched. The results show that the radial forces of the impeller and the blades increase with the increase of the blade outlet angle at the same flow rate. With the same blade outlet angle, the radial forces decrease with the increase of the flow rate. The roundness of radial force vector diagram becomes more obvious with the decrease of the blade outlet angle. The root mean square (RMS) of radial force on the blades is about 30% of that on the impeller. The main frequency of radial force on the impeller and the blades is the axial passing frequency (APF), and that of impeller torque is the blade passing frequency (BPF), and there are peaks at the blade frequency multiplier. At the same flow rate, the main frequency and maximum fluctuation amplitudes on the impeller and the blades increase with the increase of the blade outlet angle. Meanwhile, the impeller torque increases with the increase of the blade outlet angle. With the same blade outlet angle, the main frequency, maximum fluctuation amplitudes, and the impeller torque decrease with the increase of the flow rate. The amplitude difference decreases with the increase of the flow rate. The blade outlet angle has an obvious greater influence on the radial forces and fluctuation at the small flow rate. The vibration test shows that the vibration intensities of model 25 and model 35 are less than 2.5 mm/s, and the vibration intensity of model 25 is about 0.2 mm/s less than that of model 35.

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Research on the effect of wear-ring clearances to the axial and radial force of a centrifugal pump

Cited by 12 publications

References 0 publications

Investigation of the Starting-Up Axial Hydraulic Force and Structure Characteristics of Pump Turbine in Pump Mode

Investigation of the Starting-Up Axial Hydraulic Force and Structure Characteristics of Pump Turbine in Pump Mode

Experiment and simulation about the effect of wear-ring abrasion on the performance of a marine centrifugal pump

Effect of Blade Outlet Angle on Radial Force of Marine Magnetic Drive Pump

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