Velocity characteristics in a multiphase pump under different tip clearances

Shi, Guangtai; Liu, Zongku; Xiao, Yexiang; Li, Helin; Liu, Xiaobing

doi:10.1177/0957650920946533

Cited by 16 publications

(12 citation statements)

References 27 publications

(25 reference statements)

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“…Over the past few decades, numerous academic studies have been conducted to assess flow loss. [12][13][14] Yasuyuki et al 15 proposed a method for the quantitative analysis of hydraulic loss through a combination of numerical simulations and model tests, and they analysed the hydraulic loss of different flow-passing components in the turbine. However, as the internal flow of hydraulic machinery exhibits complex threedimensional motion, the flow loss exhibits an uneven distribution in space.…”

Section: Introductionmentioning

confidence: 99%

Entropy production analysis for energy dissipation of a vertical mixed-flow pump device under asymmetric inflow conditions

Zheng

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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To investigate the influence of the inflow angle on the hydraulic loss and internal flow fields of a vertical mixed-flow pump device, unsteady numerical simulations were performed under different inflow angles ( θ = 0°, 10°, 20°, and 30°). The calculation results were validated using an external characteristic test at an inflow angle of 0°. The entropy production theory was applied to analyse the energy loss and dissipation rate distribution in a vertical mixed-flow pump device under different inflow angles. Influenced by asymmetric inflow, the design point of the external characteristics deviated towards the overload flow rate, and the maximum deviations were obtained under 1.2 Qdes, whereas the influence of the inflow angle on the internal flow fields was the most significant under the part-load flow rate. When the inflow angle increased from 0° to 30°, the total entropy production in the pump device increased by 18.35% under 0.6 Qdes, and indirect dissipation accounted for the largest proportion. The internal flow patterns in the impeller and guide vane were also distorted by asymmetric inflow. The indirect dissipation rate on the suction side of the impeller blade, interface between the impeller and diffuser, and pressure side of the guide vane increased significantly with an increase in the inflow angle. To restrain the influence of asymmetric inflow, it is of great significance to optimise the hydraulic design structure of the inflow runner. In this study, a middle spacer pier was used to improve the operational efficiency of the pump device.

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Section: Introductionmentioning

confidence: 99%

Entropy production analysis for energy dissipation of a vertical mixed-flow pump device under asymmetric inflow conditions

Zheng

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Kim Changhyun et al [8] proposed four different sizes of inducer tip clearances, and hydraulic performance under cavitation condition and non-cavitation condition was analyzed by simulation. Shi Guangtai et al [9] analyzed the internal flow and velocity distribution characteristics of the multiphase pump under different tip clearances, by employing the high-speed photography and numerical simulation, it found that tip leakage vortex has significant effect on the tip separated vortex and the hydraulic loss of pump. Li Wei et al [10][11] proposed a mixed-flow pump model with non-uniform tip clearance, through the technology of particle image velocimetry to analyze the effect of flow rate and eccentricity on the flow characteristics.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Research on the Influence of Clearance Between Impeller and Cover on the Pump Performance

Peng

Hong

Chang

et al. 2022

mech

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Centrifugal pump is widely used and plays an important role in national economy. However, according to plenty of engineering practice and model tests, it indicated that the clearance between the impeller and pump cover is an important parameter for leakage loss and hydraulic efficiency. In this paper, a single stage centrifugal pump was selected to study the influence of clearance between impeller and pump cover on the hydraulic performance through combination of experiment and numerical simulation. Commercial software ANSYS CFX was employed to simulate the internal flow field with a clearance of 0 mm, and the experimental verification was carried out. The results presented that only a small difference was generated between experiment and numerical simulation, the maximum error is less than 4%, which can ensure the accuracy of the numerical calculation. At the same time, by comparing the simulation results with clearance of 0.1 mm, 0.22 mm, 0.42 mm and 0.62 mm, it found that with the increase of clearance, the impact loss at the tongue was significantly improved. In addition, with the increase of clearance, the effect of water flowing out from clearance interferes with the water at impeller inlet gradually improve. Finally, the hydraulic experiment with different clearance were carried out to verify the numerical result. Therefore, this research results have significant guiding effect for the design of clearance between impeller and cover in the future.

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“…Thus, the BTC of the traditional pump is similar to the backflow clearance of full tubular pump, and the research on BTC can provide some references. Many scholars used numerical simulation and test measurement (high-speed photography and particle image velocimetry) to study the TLV in axial flow pump [7], mixed flow pump [8], pump jet [9,10], and multiphase pump [11]. The research found that the evolution of TLV includes splitting stage, developing stage and merging stage [12].…”

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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Velocity characteristics in a multiphase pump under different tip clearances

Cited by 16 publications

References 27 publications

Entropy production analysis for energy dissipation of a vertical mixed-flow pump device under asymmetric inflow conditions

Entropy production analysis for energy dissipation of a vertical mixed-flow pump device under asymmetric inflow conditions

Numerical and Experimental Research on the Influence of Clearance Between Impeller and Cover on the Pump Performance

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

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