Mechanism and propagation characteristics of rotating stall in a mixed-flow pump

Li, Wei; Li, Enda; Ji, Leilei; Zhou, Lian; Shi, Weidong; Zhu, Yong

doi:10.1016/j.renene.2020.02.003

Cited by 110 publications

(42 citation statements)

References 38 publications

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“…Water 2020, 12, x FOR PEER REVIEW 9 of 16 larger the pre-whirl will be. Because the energy in the process was provided by the impeller, the countercurrent caused by the pre-swirl flow consumed part of the impeller power [45]. As shown in Figure 9, at the same end clearance, the head and efficiency of the second and third stage impellers were reduced compared to the first stage impeller, and the second and third stage impellers shared similar performance.…”

Section: Influence Of End Clearance On the Performance Of Impellersmentioning

confidence: 98%

“…The smaller the flow is, the greater the countercurrent and the larger the pre-whirl will be. Because the energy in the process was provided by the impeller, the countercurrent caused by the pre-swirl flow consumed part of the impeller power [45]. larger the pre-whirl will be.…”

Section: Influence Of End Clearance On the Performance Of Impellersmentioning

confidence: 99%

“…larger the pre-whirl will be. Because the energy in the process was provided by the impeller, the countercurrent caused by the pre-swirl flow consumed part of the impeller power [45]. Figure 11 is the pressure diagram of the second-stage impeller and cavity under different end clearances at design flow rate.…”

Section: Influence Of End Clearance On the Performance Of Impellersmentioning

confidence: 99%

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Numerical Investigation of a High-Speed Electrical Submersible Pump with Different End Clearances

Zhou

Wang

Hang

et al. 2020

Water

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The end clearance of the impeller is one of the most important structural parameters in the hydraulic design of a high-speed electrical submersible pump (ESP). In this paper, an ESP with a rotating speed of 6000 r/min was taken as the research object. Numerical calculations were carried out for five different end clearance conditions of 0.1 mm, 0.3 mm, 0.6 mm, 0.9 mm, and 1.2 mm, respectively, to obtain the performance and internal flow field under different situation. The simulation results were verified by the pump performance experiment. It showed that the increase of the end clearance led to a decrease of the head and efficiency of the electrical submersible pump. Through the analysis of the internal flow field, it was found that the existence of the end clearance reduced the flow rate and caused free pre-whirl. With the increase of the end clearance, the phenomenon of de-flow in the diffuser passage was aggravated, which further reduced the performance of the electrical submersible pump. Finally, the reasonable recommended value of the end clearance was given, which facilitated the optimization design and engineering application of the high-speed ESP.

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Section: Influence Of End Clearance On the Performance Of Impellersmentioning

confidence: 98%

Section: Influence Of End Clearance On the Performance Of Impellersmentioning

confidence: 99%

Section: Influence Of End Clearance On the Performance Of Impellersmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Investigation of a High-Speed Electrical Submersible Pump with Different End Clearances

Zhou

Wang

Hang

et al. 2020

Water

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“…Therefore, the volume fraction of vapor has a periodic oscillation relationship, which is inversely proportional to the head. To analyze the frequency characteristic of pressure fluctuation, time domain data is transferred to frequency domain using fast Fourier transform (FFT) [32][33][34]. Figure 19a shows the frequency spectrum of head fluctuation in impeller, Figure 19b shows the local frequency spectrum, the range is 0~100 Hz.…”

Section: Unsteady Cavitation Evolution In Ecwpmentioning

confidence: 99%

Numerical Simulation of Cavitation Performance in Engine Cooling Water Pump Based on a Corrected Cavitation Model

Shi

et al. 2020

Processes

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To analyze the internal flow of the engine cooling water pump (ECWP) under thermodynamic effect, Zwart cavitation model based on the Rayleigh-Plesset equation is corrected, and NACA0015 hydrofoil was selected to verify the corrected model. The cavitation performances of ECWP with different temperatures were numerically simulated based on a corrected cavitation model. Research results show that simulation values of pressure distribution coefficient in hydrofoil surface at 70 °C are in closest agreement with experimental values when the evaporation and condensation coefficients are 10 and 0.002, respectively. With the decrease of absolute pressure in pump inlet, bubbles firstly occurred at the blade inlet side near the suction surface and then gradually extended to the pressure surface, finally clogged the impeller passage. Compared to the inlet section, the cavitation degree is much more serious close to the trailing edge. With the temperature increases, the cavitation in ECWP occurs in advance and rapidly, and the temperature plays an important role in promoting cavitation process in ECWP. Based on the unsteady simulation of ECWP, the influence of cavitation on the performance characteristics is studied. The results provide a theoretical reference for the prediction and optimization of the cavitation performance in ECWP.

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“…The rapid development of intelligent manufacturing has propelled electromechanical and microelectromechanical systems to pursue high precision, integration and intelligence [1][2][3][4]. At the same time, higher requirements of anti-interference, anti-impact and anti-vibration are put forward for various precise transmission devices and mechanisms [5][6][7]. Focusing mechanism is an electromechanical drive system used to adjust the focal length of a camera.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Coupled Analysis of a Micro Piezo-Driven Focusing Mechanism

Kang

Zhong

et al. 2020

Micromachines

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In order to improve the response speed and output force of the camera focusing mechanism, the authors proposed a novelty micro focusing mechanism based on piezoelectric driving, which has the characteristics of rapid response, high precision positioning and large displacement focusing. In this paper, the operating principle of the proposed focusing mechanism is presented. Using the piezoelectric output characteristic, the movable tooth drive theory and the screw drive theory, the electromechanical coupling mechanical model and equations of the piezoelectric focusing mechanism are established. Through MATLAB simulation, the output characteristics of the piezoelectric focusing mechanism are calculated. The results indicate that the maximum thrust force of the lens and the maximum output torque of the movable tooth drive for the piezoelectric focusing mechanism are 562.5 N and 1.16 Nm, respectively. Furthermore, the driving voltage directly affects the output performance of the piezoelectric focusing mechanism. These results can be utilized both to optimize the dimensions and improve the overall performance of the piezo-driven focusing mechanism.

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Mechanism and propagation characteristics of rotating stall in a mixed-flow pump

Cited by 110 publications

References 38 publications

Numerical Investigation of a High-Speed Electrical Submersible Pump with Different End Clearances

Numerical Investigation of a High-Speed Electrical Submersible Pump with Different End Clearances

Numerical Simulation of Cavitation Performance in Engine Cooling Water Pump Based on a Corrected Cavitation Model

Electrochemical Coupled Analysis of a Micro Piezo-Driven Focusing Mechanism

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