Pressure fluctuation characteristics in the sidewall gaps of a centrifugal dredging pump

Cao, Lihua; Xiao, Yexiang; Wang, Zhengwei; Luo, Yongyao; Zhao, Xiaoran

doi:10.1108/ec-12-2015-0383

Cited by 10 publications

(5 citation statements)

References 19 publications

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“…e pressure fluctuations at the top dead centre of the volute provide a better indication than at the discharge [6]. e radial and axial distributions of the fluctuation characteristics at the gap of the pump are analyzed, and the maximum pressure fluctuation occurs at the blade front side [7]. e pressure fluctuations in the impeller inlet show more complication in part flow conditions than at the best efficiency point [8].…”

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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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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“…A large number of centrifugal pumps are being used for slurry pipeline transportation systems. Erosion is a common problem for these pumps, which often leads to a reduction of the hydraulic performance, an increase in the noise and vibration level, and even worse, sometimes failure of the pumps [3,4]. The failure not only leads to the replacement of the defective parts but may also cause the shutdown of the whole transportation system.…”

Section: Introductionmentioning

confidence: 99%

“…For all kinds of flows inside the pump, the leakage flow from the impeller clearances can have a considerable effect on the pump performance [5][6][7]. Cao et al [2,3] have numerically investigated the pressure fluctuations for the leakage flow inside a centrifugal pump and found that the interaction between the main flow and leakage flow is strong and cannot be neglected. Furthermore, with the variation of the axial clearances, the main flow characteristic can be greatly affected.…”

Section: Introductionmentioning

confidence: 99%

Slurry Flow and Erosion Prediction in a Centrifugal Pump after Long-Term Operation

et al. 2019

Self Cite

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After long-term operation, the material loss due to slurry erosion often leads to significant changes in the impeller geometry. This change can, in turn, affect the flow characteristics and the erosion mechanism in a centrifugal pump. To investigate this matter, we consider two geometric models based on a prototype stainless steel impeller, which failed due to huge erosion problems from the pulp slurry. These two models are different in the degree of wear, with one model at the pre-erosion stage and the other with worn blades. For both models, the flow characteristics have been obtained in the Eulerian reference frame by means of the SST k-ω model. Then, in order to determine the erosion patterns, the particles have been tracked in the Lagrangian reference frame. In this way, the influence of the flow characteristics on the erosion patterns has been analyzed. Results show that the geometric variations greatly affect the flow characteristics, and consequently the erosion patterns. Particularly, it has been found that the clearance flow plays a significant role in defining erosion characteristics, such as erosion distribution, areas, and rates. Interestingly, the simulation results for current study show that the erosion rates after long-term operation greatly decrease near both the outlet edge and the blade bottom. It follows also that for accurate erosion predictions, these geometric variations have to be considered in the numerical model. This paper provides a better understanding of the complex erosion mechanism in centrifugal pumps, which can help to reduce the wear in future designs.

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“…Mud pumps are key facilities to compress low-pressure mud into high-pressure mud and are widely used in industrial manufacture, geological exploration, and energy power owing to their generality [1][2][3][4]. Mud pumps are the most important power machinery of the hydraulic pond-digging set during reclamation [5] and are major facilities to transport dense mud during river dredging [6]. During oil drilling, mud pumps are the core of the drilling liquid circulation system and the drilling facilities, as they transport the drilling wash fluids (e.g., mud and water) downhole to wash the drills and discharge the drilling liquids [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Sealing Performance of Bionic Striped Mud Pump Piston

Cong

Gao

Sun³

et al. 2019

Advances in Materials Science and Engineering

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The mud pump piston is a key part for providing mud circulation, but its sealing performance often fails under complex working conditions, which shorten its service life. Inspired by the ring segment structure of earthworms, the bionic striped structure on surfaces of the mud pump piston (BW-160) was designed and machined, and the sealing performances of the bionic striped piston and the standard piston were tested on a sealing performance testing bench. It was found the bionic striped structure efficiently enhanced the sealing performance of the mud pump piston, while the stripe depth and the angle between the stripes and lateral of the piston both significantly affected the sealing performance. The structure with a stripe depth of 2 mm and angle of 90° showed the best sealing performance, which was 90.79% higher than the standard piston. The sealing mechanism showed the striped structure increased the breadth and area of contact sealing between the piston and the cylinder liner. Meanwhile, the striped structure significantly intercepted the early leaked liquid and led to the refluxing rotation of the leaked liquid at the striped structure, reducing the leakage rate.

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Pressure fluctuation characteristics in the sidewall gaps of a centrifugal dredging pump

Cited by 10 publications

References 19 publications

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

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

Slurry Flow and Erosion Prediction in a Centrifugal Pump after Long-Term Operation

Sealing Performance of Bionic Striped Mud Pump Piston

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