Investigation on stall characteristics of marine centrifugal pump considering transition effect

Ye, Changliang; Tang, Yuan; An, Dongsen; Wang, Fujun; Zheng, Yuan; Esch, B.P.M. van

doi:10.1016/j.oceaneng.2023.114823

Cited by 20 publications

(7 citation statements)

References 50 publications

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“…have begun to conduct experiments and numerical simulation studies on the runaway mode of the pump unit [21,22]. Kan K et al [23] analyzed in detail the flow characteristics and energy loss of the internal flow field during the runaway process of an axial flow pump unit.…”

Section: Three-dimensional Modeling Of Centrifugal Pumpmentioning

confidence: 99%

“…When the pump unit is shut down due to sudden power failure or maloperation, it will eventually enter runaway mode, and when the pump unit is running in runaway mode, some parts of the pump unit may be damaged due to the mass imbalance of the rotating body and the hydraulic instability inside the unit [20]. More and more scholars have begun to conduct experiments and numerical simulation studies on the runaway mode of the pump unit [21,22]. Kan K et al [23] analyzed in detail the flow characteristics and energy loss of the internal flow field during the runaway process of an axial flow pump unit.…”

Section: Introductionmentioning

confidence: 99%

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A Study on the Transient Characteristics of the Power-Off Transition Process of a Double-Volute Centrifugal Pump

Lu,

Ren,

Wang

et al. 2024

Water

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A double-volute centrifugal pump is a very important pump type; the internal flow field of a centrifugal pump will change drastically during the transition process of power failure, which will affect the safety and stability of the pump’s operation. In this paper, the CFD numerical simulation method is used, and the UDF procedure is developed to realize the continuous update of the impeller speed at each time step. The working parameters, such as the torque and flow rate at the instantaneous moment, are obtained through the sequential iteration of each small step, and a numerical simulation of the power-off transient is carried out on a double-volute centrifugal pump; additionally, the changes in the external characteristic parameters and the internal flow field of the centrifugal pump are analyzed in detail. The results show that the double-volute centrifugal pump experienced four different modes after power failure, namely pump mode, braking mode, turbine mode, and runaway mode, and the absolute values of the runaway speed and runaway flow rate are 1.465 times and 1.21 times the initial values, respectively. Through the analysis of the flow field in different regions, the change processes of the generation, development, and disappearance of the vortex at each position of the centrifugal pump are obtained, and the change and development processes of the internal velocity gradient of the centrifugal pump are obtained. In addition, it is found that the high-speed area located in the second volute runner is larger than that of the first volute runner because the second volute runner is shorter and narrower than the first volute runner.

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Section: Three-dimensional Modeling Of Centrifugal Pumpmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Study on the Transient Characteristics of the Power-Off Transition Process of a Double-Volute Centrifugal Pump

Lu,

Ren,

Wang

et al. 2024

Water

View full text Add to dashboard Cite

show abstract

“…However, within the variable speed operation range of the centrifugal pump, unstable hump characteristics and cavitation phenomena often occur, shortening the pump's service life and reducing the reliability of its operation due to the generation of vibration and noise. Consequently, there are some restrictive technical problems involved in addressing the hump instability characteristic [3][4][5][6][7] and the cavitation characteristic [8][9][10][11][12][13] in the optimization design of the variable speed centrifugal pump.…”

Section: Introductionmentioning

confidence: 99%

Study on Impeller Optimization and Operation Method of Variable Speed Centrifugal Pump with Large Flow and Wide Head Variation

Zheng,

Meng,

Zhang

et al. 2024

Water

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The benefits of variable speed centrifugal pumps include high stability, a broad operating range, and adjustable input power. In water distribution systems, the pump units are increasingly using variable speed technology. The energy-saving features and operational stability of the pump station are directly impacted by the hydraulic performance and the operation strategy. In this study, CFD numerical analysis and model tests were adopted to design and evaluate the hydraulic performance of the variable speed centrifugal pump with large flow and wide head variation in Liyuzhou Pump Station. Under the premise of ensuring the wide head variation, the optimized centrifugal pump met the requirements of hump margin and efficiency in the high head zone and the cavitation margin in the low head zone. The test results demonstrated that the operational range of the variable speed centrifugal pump was successfully widened by reasonable hydraulic parameters selection and impeller optimization. The safe and efficient operational range of the variable speed unit was determined by means of taking the performance requirements of the pump’s maximum input shaft power, cavitation characteristics and pressure fluctuation into consideration. The scientific and reasonable operational path to meet the various operation needs was also investigated and determined for the pump station’s actual operation needs. A high efficiency, safe operation, and a simplified control logic were achieved by using the operational path, which makes it a reasonable potential guide for hydraulic design and operational optimization of variable speed centrifugal pumps with large flow and wide head range.

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“…In the coupling of all turbulence models, the SST γ-Re θt , in addition to the SST k-ω turbulence model, is the most widely utilized, not just for aerodynamics transition and separation prediction [28] but also in the field of hydraulics. Rahman [29], Zeng [30,31], and Ye [32,33] used the SST γ-Reθt to the boundary laminar flow of hydrofoil, which transits along the middle and low Reynolds numbers, and the transition of hydrofoil hydrodynamics is analyzed. However, the model needs to solve the batch factor equation and the transition criterion equation at the same time, and the calculation is slightly cumbersome.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Suction Flow Control Technology for a Blunt Trailing Edge Hydrofoil

Yang,

Zhang,

Yan

et al. 2023

Mathematics

Self Cite

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The generation of hydro-mechanical resonance is related to the transition of the boundary layer and the development of vortex shedding. The application effect of suction control in hydrodynamics is equally deserving of consideration as an active control technique in aerodynamics. This study examines how suction control affects the flow field of the NACA0009 blunt trailing edge hydrofoil using the γ transition model. Firstly, the accuracy of the numerical method is checked by performing a three-dimensional hydrofoil numerical simulation. Based on this, three-dimensional hydrofoil suction control research is conducted. According to the results, the suction control increases the velocity gradient in the boundary layer and delays the position of transition. The frequency of vortex shedding in the wake region lowers, and the peak value of velocity fluctuation declines. The hydrofoil hydrodynamic performance may be successfully improved with a proper selection of the suction coefficient via research of the suction coefficient and suction position on the flow field around the hydrofoil. The lift/drag ratio goes up as the suction coefficient goes up. The boundary layer displacement thickness and momentum thickness are at their lowest points, and the velocity fluctuation amplitude in the wake region is at its lowest point as the suction coefficient Cμ = 0.003. When the suction slots are at the leading edge, the momentum loss in the boundary layer is minimal and the velocity fluctuation in the wake zone is negligible.

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Investigation on stall characteristics of marine centrifugal pump considering transition effect

Cited by 20 publications

References 50 publications

A Study on the Transient Characteristics of the Power-Off Transition Process of a Double-Volute Centrifugal Pump

A Study on the Transient Characteristics of the Power-Off Transition Process of a Double-Volute Centrifugal Pump

Study on Impeller Optimization and Operation Method of Variable Speed Centrifugal Pump with Large Flow and Wide Head Variation

Numerical Investigation on Suction Flow Control Technology for a Blunt Trailing Edge Hydrofoil

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