Influence of rotor eccentricity on vibration characteristics in a five-stage centrifugal pump with vaned diffusers

Wang, Kai; Ma, Qijiang; Wang, Chengbin; Liu, Houlin; Xia, Chen

doi:10.1177/1461348419854610

Cited by 2 publications

(3 citation statements)

References 18 publications

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“…The schematic diagram of the test rig is shown in Figure 2. In this study, the turbomachinery closed-type test rig conforming to IEC-60193 standard 30 is used for the experiment. The data of head, flow rate, shaft power and pressure pulsation were measured.…”

Section: Research Objectivementioning

confidence: 99%

“…27,28 Current studies have shown that the gap of vaneless region changes due to eccentricity can affect rotor-stator interaction and the stability of flow. 29,30 Wang et al 31 found that the eccentric impeller has an obvious influences on the muti-stage centrifugal pump caused serious vibration. Zhao et al 32 found that the eccentricity influences radial force and cavitation in reactor coolant pump.…”

Section: Introductionmentioning

confidence: 99%

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Influence of eccentric impeller on pressure pulsation of large-scale vaned-voluted centrifugal pump

Tao

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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Large-scale vaned-voluted centrifugal pump is a key component in water conveyance engineering. Hydraulic performance and pressure pulsation are important assessment indicators for operation efficiency and stability. During the common operation, the impeller eccentricity is easy to occur due to installation error, radial force and other reasons, which results the changes of hydraulic performance and pressure pulsation. In this study, the hydraulic performance and pressure pulsation in the vaneless region are analyzed by computational fluid dynamics method. The influence of eccentric impeller on the hydraulic performance in each components and the pressure pulsation is studied. Results show that the eccentric impeller causes the increasing of hydraulic dissipation especially in the volute. However, decreasing of the hydraulic dissipation happens in the draft tube. Impeller eccentricity significantly enhances the amplitude of rotation frequency, but has no obvious effect on the blade passing frequency and its harmonics. The peak-peak value of pressure pulsation of eccentric impeller increases rapidly with the eccentricity ratio. The results of this study provide scientific support for solving the stability problem caused by eccentric impeller in engineering cases.

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Section: Research Objectivementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of eccentric impeller on pressure pulsation of large-scale vaned-voluted centrifugal pump

Tao

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…Modal analysis is a crucial basis for analyzing vibration issues in centrifugal pumps and is an essential factor in the design of dynamic devices [ 33 ]. This study focuses on the rotor system of a four-stage centrifugal pump with a balancing disc fixed using a simple beam support.…”

Section: Introductionmentioning

confidence: 99%

Improved calculation method for dry modal analysis of four-stage centrifugal-pump rotor system based on concentrated-mass method

Li,

Wei,

Gao

et al. 2024

PLoS ONE

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To improve the accuracy of modal analysis for a four-stage centrifugal-pump rotor system with a balancing disc based on the concentrated-mass analytical method, a simplified concentrated mass mathematical model and an ANSYS simulation model are established. The results from these two models are compared to determine factors that cause significant differences in the mode shapes. Subsequently, an optimized mathematical model based on the corrected mass moment of an inertia matrix and stiffness correction coefficients is proposed, and the effectiveness of this optimized mathematical model is validated using a four-stage centrifugal pump with back blades. The results show that the natural frequencies obtained from the ANSYS simulations are consistently higher than those obtained using the analytical method. The simplification of the moment of inertia at the impeller and balancing disc contributes primarily to the calculated errors. The optimized mathematical model reduces the errors in the natural frequencies from 12.96%, 12.13%, 9.96%, 5.85%, and 8.74% to 2.45%, 1.56%, 0.65%, 5.34%, and 2.28%, respectively. The optimization of natural frequencies offers better performance at lower-order modes, whereas its effects on higher-order modes are less significant. The optimization method is applicable to centrifugal pumps with back blades and reduces the error in theoretical calculations, based on reductions in the concentrated mass from 13.11%, 12.85%, 9.91%, and 7.2% to 3.7%, 3.86%, 0.57%, and 2.87%, respectively, thus further confirming the feasibility of the optimized model design.

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Influence of rotor eccentricity on vibration characteristics in a five-stage centrifugal pump with vaned diffusers

Cited by 2 publications

References 18 publications

Influence of eccentric impeller on pressure pulsation of large-scale vaned-voluted centrifugal pump

Influence of eccentric impeller on pressure pulsation of large-scale vaned-voluted centrifugal pump

Improved calculation method for dry modal analysis of four-stage centrifugal-pump rotor system based on concentrated-mass method

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