Numerical Simulation of the Transient Process of Power Failure in a Mixed Pump

Ma, Xudan; Liu, Jintao; Wang, Leqin

doi:10.1155/2013/743201

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…They also used PIV technique to capture transient flow evolutions in the pump and drew a conclusion that the transient vortex evolution between blades was more important than reversed flow at the blade inlet to the transient head coefficient. Ma et al [9] used a hydraulic-force coupling method to simulate the transient process of power failure condition. They pointed out that the differences between transient and quasi-steady results were caused by the inertia effect of fluid contained in the pump and the pipeline.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Transient Flow in a Centrifugal Charging Pump during Charging Operating Process

Zhang

Yuan

et al. 2014

Advances in Mechanical Engineering

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Centrifugal charging pumps are important components of nuclear power plants and must be operated under multioperating conditions for the requirements of the system. In order to investigate the internal flow mechanism of the centrifugal charging pump during the transient transition process of charging operating from = 34 m 3 /h to = 110 m 3 /h, numerical simulation and experiment are implemented in this study. The relationship between flow rate and time is obtained from the experiment and worked as the boundary condition to accurately accomplish the numerical simulation during the transient process. External and internal characteristics under the variable operating conditions are analyzed through the transient simulation. The results show that the liquid viscosity, large scale vortexes exist in the flow passages in the beginning of the variable operating conditions, which indicates flow separation and the sudden changes in direction of velocity. As the flow rate increases gradually, the flow angles of the fluid in inlet accelerate correspondingly and the flow along the blade is more uniform, which leads to a decrease and movements of the vortexes. The contents of the current work can provide references for the design optimization and fluid control of the pump used in the transient process of variable operating conditions.

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Section: Introductionmentioning

confidence: 99%

Investigation of Transient Flow in a Centrifugal Charging Pump during Charging Operating Process

Zhang

Yuan

et al. 2014

Advances in Mechanical Engineering

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“…Based on the physical model, mathematical model is established, through all kinds of method to solve each field variables. From the computer numerical simulation research and related literature of quenching heat treatment process, we can receive [1] :the core of the rail numerical simulation is the study of specimen with quenching medium in the heat exchange among the situation, the specimen temperature field, stress field and the coupling relationship between organizational change when quenching.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Analysis of Rail Head for U75V in the Process of Spray Cooling Temperature Field

Chen

Duan

et al. 2014

AMR

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In this paper, for the rail U75V rail head spray quenching process temperature field, we founded model, meshed, loaded, and solved the finite element simulation of the process by using ABAQUS finite element analysis software, and carried on the site test using the infrared thermal imager, we received the changing discipline with time of the temperature of rail. The results of simulation are close with actual process. The precise calculation for the future in the process of quenching heat stress and residual stress laid the foundation experiment.

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Comparison of transient characteristics of positive and negative power-off transition process of “S” shaped bi-directional full-flow pump

et al. 2023

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In this study, the positive and negative power-off process of a bi-directional full-flow pump is investigated by model tests and numerical simulations, and the results show that under steady conditions, the head of the bi-directional full-flow pump in the positive direction is larger than in the negative direction. The positive power-off process of the bi-directional full-flow pump is slower than the negative power-off process. The clearance backflow rate of the bi-directional full-flow pump continues to drop during the power-off process until it remains stable under the runaway condition. The clearance backflow causes the vortex at the impeller inlet and the size of the vortex gradually decreases during the power-off process. Compared to the positive power-off process, the backflow vortex ratio is greater, and therefore, the flow pattern is poorer during the negative power-off process. The entropy production rate in the negative power-off process is significantly greater than that in the positive power-off process. The pumping condition has the largest hydraulic loss in the whole power-off process. The runaway rotational speed in the positive power-off process is higher than that in the negative power-off process, and the axial force in the positive runaway condition is 1.40 times greater than in the negative runaway condition. During the power-off process, the vibration and pressure pulsation in the negative operation is significantly greater than that in the positive operation, and the acceleration of the impeller vibration from large to small is the Y (vertical) direction, Z (axial) direction, and X (horizontal) direction. The research in this paper can provide an important reference for the design and operation of the bi-directional full-flow pump.

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Numerical Simulation of the Transient Process of Power Failure in a Mixed Pump

Cited by 4 publications

References 7 publications

Investigation of Transient Flow in a Centrifugal Charging Pump during Charging Operating Process

Investigation of Transient Flow in a Centrifugal Charging Pump during Charging Operating Process

Numerical Simulation Analysis of Rail Head for U75V in the Process of Spray Cooling Temperature Field

Comparison of transient characteristics of positive and negative power-off transition process of “S” shaped bi-directional full-flow pump

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