Failure and redesign of a high-speed pump with respect to rotor-stator interaction

Olimstad, Grunde; Østby, Petter Thorvald Krogh

doi:10.1016/j.engfailanal.2019.06.041

Cited by 14 publications

(5 citation statements)

References 10 publications

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“…Это особенно важно при моделировании режимов с низкой подачей, когда в объеме рабочего колеса наблюдается значительное вихреобразование [Li et al, 2016]. Пульсации давления из-за взаимодействия ротора и диффузора приводят к появлению динамической нагрузки на рабочем колесе, что в свою очередь может привести к разрушению лопаток рабочего колеса [Olimstad, Østby, 2014]. Во FlowVision реализован и другой метод моделирования вращения импеллера -«замороженный ротор».…”

Section: метод скользящих сетокunclassified

Centrifugal pump modeling in FlowVision CFD software

Akimov,

Borisov

2023

CRM

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This paper presents a methodology for modeling centrifugal pumps using the example of the NM 1250 260 main oil centrifugal pump. We use FlowVision CFD software as the numerical modeling instrument. Bench tests and numerical modeling use water as a working fluid. The geometrical model of the pump is fully three-dimensional and includes the pump housing to account for leakages. In order to reduce the required computational resources, the methodology specifies leakages using flow rate rather than directly modeling them. Surface roughness influences flow through the wall function model. The wall function model uses an equivalent sand roughness, and a formula for converting real roughness into equivalent sand roughness is applied in this work. FlowVision uses the sliding mesh method for simulation of the rotation of the impeller. This approach takes into account the nonstationary interaction between the rotor and diffuser of the pump, allowing for accurate resolution of recirculation vortices that occur at low flow rates.The developed methodology has achieved high consistency between numerical simulations results and experiments at all pump operating conditions. The deviation in efficiency at nominal conditions is 0.42 %, and in head is 1.9 %. The deviation of calculated characteristics from experimental ones increases as the flow rate increases and reaches a maximum at the far-right point of the characteristic curve (up to 4.8 % in head). This phenomenon occurs due to a slight mismatch between the geometric model of the impeller used in the calculation and the real pump model from the experiment. However, the average arithmetic relative deviation between numerical modeling and experiment for pump efficiency at 6 points is 0.39 %, with an experimental efficiency measurement error of 0.72 %. This meets the accuracy requirements for calculations. In the future, this methodology can be used for a series of optimization and strength calculations, as modeling does not require significant computational resources and takes into account the non-stationary nature of flow in the pump.

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Section: метод скользящих сетокunclassified

Centrifugal pump modeling in FlowVision CFD software

Akimov,

Borisov

2023

CRM

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“…The integrated and split types have a filtering device at the impeller inlet, which may result in a certain hydraulic flow loss [2] . Such loss will be dynamically increased as foreign substances build up inside the filtering tank.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the hydraulic design of pool pumps and the effect of impeller balance holes on pump performance

Zhong,

Sha,

et al. 2024

Fourth International Conference on Mechanical Engineering, Intelligent Manufacturing, and Automation Technology (MEMAT 2023)

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To study the design method of pool centrifugal pumps and the feasibility of drilling balance holes, upon the summary of six excellent hydraulic models, this paper proposed an innovative VCM (velocity-coefficient method)-based hydraulic design method for optimizing cavitation performance of centrifugal pumps. This innovative method has been field-proven with high accuracy and practicability. Based on that, a pool centrifugal pump type was developed with a specific speed of up to 175 rps, and the hydraulic design process and outcomes were elaborated. Moreover, the effect of balance holes on pump performance was discussed, and based on the SST k-ω turbulence model, the performance-axial force curves were plotted under different flow rate conditions of the modeled pumps with and without balance holes upon computations in the numerical simulation models of pool pumps established through the finite volume method (FVM). The analysis shows that balance holes are conducive to a decrease in the axial force by up to 19.6% but greatly affect pump performance due to their hydraulic characteristics. This paper provides a constructive scientific basis for optimizing design and improving the reliability of centrifugal pumps.

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“…It is the core hydraulic mechanical equipment in the pump station project and even the whole cross-basin water transfer system [1][2][3]. To satisfy the large scale of time and space water delivery requirements, the stay vane volute pump is required higher compared with the nonvane centrifugal pump in the efficiency, cavitation, stability and other performance index [4,5]. The internal flow of the stay vane volute pump belongs to supercritical Reynolds number flow, and its fluid inertia force is far greater than the fluid viscous force [6,7].…”

Section: Introductionmentioning

confidence: 99%

Research on Radial Force of the Volute Pump with Stay Vanes at Medium-high Specific Speed

Zhang,

Feng,

et al. 2024

J. Phys.: Conf. Ser.

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In this paper, to study unsteady hydraulic excitation characteristics of the impeller in stay vane volute pump, the radial force of that is investigated by vector analysis, time-frequency analysis and unsteady flow field analysis etc. Results show that the radial force distribution on the impeller has a linear relationship with the number of the blade under high flow conditions. Furthermore, the radial force has obvious directivity under low flow conditions. The radial force of the impeller is mainly distributed on the blade and the shroud. Interestingly, it is found that the radial force on the impeller is smaller than the radial force on the blade and shroud respectively, when there are cross peaks between the blade and the shroud. In addition, the results of the unsteady flow field analysis reveal that the radial force distribution of the impeller is unbalanced under low flow conditions. This result is due to the fact that jet wake forms at the impeller outlet and radial vortex leads to rotating stall in the flow channel. This work may provide some theoretical references for the optimal design and stable operation of the stay vane volute pump.

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Failure and redesign of a high-speed pump with respect to rotor-stator interaction

Cited by 14 publications

References 10 publications

Centrifugal pump modeling in FlowVision CFD software

Centrifugal pump modeling in FlowVision CFD software

Experimental study on the hydraulic design of pool pumps and the effect of impeller balance holes on pump performance

Research on Radial Force of the Volute Pump with Stay Vanes at Medium-high Specific Speed

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