Effects of the staggered blades on unsteady pressure pulsations and flow structures of a centrifugal pump

Zhang, Ning; Gao, Bo; Li, Chao; Ni, Dan; Li, Guoping

doi:10.1177/0957650920987328

Cited by 6 publications

(3 citation statements)

References 35 publications

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“…According to the connection relationship between grid points, the grid division mainly includes three categories: structured grid, unstructured grid and mixed grid. 17 The unstructured grid is selected to mesh the centrifugal pump. The flow field inside the centrifugal pump is divided into grids by using Ansys ICEM software.…”

Section: Grid Division Of Computational Domainmentioning

confidence: 99%

“…The grid division of centrifugal pumps before numerical calculation is an important task, and the grid quality determines the quality of the final calculation results. According to the connection relationship between grid points, the grid division mainly includes three categories: structured grid, unstructured grid and mixed grid 17 …”

Section: Hydraulic Model Design Of Centrifugal Pumpmentioning

confidence: 99%

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The influence of blade curvature radius on the internal unsteady characteristics of a centrifugal pump

Wang,

Liu,

Cao

2024

Energy Science & Engineering

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To study the influence of the blade curvature radius on the flow‐induced vibration and noise of the centrifugal pump, the internal sound field of the IS 80‐65‐160 centrifugal pump was numerically calculated by adjusting the blade wrap angles to change the blade curvature radius. The RNG (Reynolds Time Average Simulation) turbulence model was selected for the numerical calculation of the centrifugal pump. The numerical simulation of the whole flow channel of the centrifugal pump was carried out using Ansys Fluent software, and the external characteristic curve of the centrifugal pump was obtained. The influence of different blade wrap angles on the internal pressure, velocity and Turbulent Kinetic Energy of the centrifugal pump was obtained. On the basis of the sound–structure coupling equation, the unsteady sound field of the centrifugal pump was calculated, and the time domain and frequency domain characteristics of the pressure pulsation at each monitoring point were obtained. The calculation results showed that the dynamic and static interference between the impeller and the volute tongue mainly caused the vibration of the centrifugal pump. By appropriately increasing the blade wrap angles, the pressure pulsation in the volute fluid domain could be effectively reduced. The vibration and noise test bench of the centrifugal pump was set up to verify the test. The experimental results showed that at the double‐blade frequency, the variation trend of the experimental value and the simulated value of the outflow flow‐induced noise of the centrifugal pump were consistent, which verified the accuracy of the sound field simulation calculation. When the blade wrap angle , it could effectively reduce the internal sound pressure level and the flow‐induced vibration and noise of the centrifugal pump. By adopting measures such as grid encryption at the position of the tongue, nonstationary calculation and comparison of different turbulence models, the accuracy of the calculation results of the internal flow field and sound field of the centrifugal pump is effectively improved, and the accuracy and reliability of the experimental results are ensured. The above research results had certain reference significance and application value for improving the working efficiency of centrifugal pumps and reducing flow‐induced vibration and noise.

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Section: Grid Division Of Computational Domainmentioning

confidence: 99%

Section: Hydraulic Model Design Of Centrifugal Pumpmentioning

confidence: 99%

The influence of blade curvature radius on the internal unsteady characteristics of a centrifugal pump

Wang,

Liu,

Cao

2024

Energy Science & Engineering

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“…Zhang et al [12] studied the influence of staggered vanes on unsteady pressure pulsation of n s =147 centrifugal pump utilizing numerical simulation. Zhang et al [13] proposed a hydrofoil blade design to suppress unsteady pressure pulsations in centrifugal pumps. Zhang et al [14] studied the influence of the gap between orifice and ring on pressure pulsation characteristics of low specific speed centrifugal pump.…”

Section: Introductionmentioning

confidence: 99%

Effect of the number of guide vanes on cavitation characteristics and pressure pulsation of centrifugal pumps

Dong,

He,

et al. 2024

J. Phys.: Conf. Ser.

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Centrifugal pumps play an important role in the national economy, they usually have complex flow fields and abundant flow structures. Based on the K-ε turbulence model and Zwart cavitation model, ANSYS was used to analyze the large guide vane centrifugal pump. Four schemes are proposed, each with 11, 13, 15, and 17 guide vanes respectively. When operating under different flow conditions, the external characteristics of the pump were analyzed and compared. The cavitation characteristics of the pump at the design flowrate and the pressure pulsation in the vaneless zone were analyzed. The influence of guide vane number on cavitation performance and pressure fluctuation in the vaneless region of the pump was studied. The final results show that the cavitation variation patterns of different schemes are similar. Z 0=13 has the best cavitation performance, and Z 0=17 has the worst cavitation performance. The change in guide vane numbers will affect the number of peaks and valleys at each monitoring point in the cycle, which correspond to guide vane numbers. Appropriately increasing guide vane numbers can reduce the amplitude of pressure fluctuation to a certain extent and reduce the pressure difference, which is beneficial for maintaining a stable state during unit operation.

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Flow-induced noise sources and reduction methods in centrifugal pumps: A literature review

2022

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The present review paper describes the research work conducted by many researchers in the field of hydro acoustics of centrifugal pumps. This study aims to understand the flow induced noise mechanism, factors affecting it, and available methods to attenuate the same in centrifugal pumps. In general, the noise generated by a pump is interpreted in terms of pressure pulsations and can be represented in the frequency domain as a combination of discrete components and broadband components. In the discrete frequency noise component, the major emphasis is given on blade pass frequency noise and its relation to rotor-stator Interaction in pumps. The intensified rotor-stator Interaction results in high pressure pulsations thus strong flow induced noise. The effect of various geometrical parameters on rotor-stator Interaction and available methods to mitigate it to reduce noise are discussed in detail. Apart from rotor-stator Interaction, the importance of energy loss mechanisms such as flow recirculation, flow-separation, jet-wakes occurrence in pumps which affect the blade pass frequency component are also discussed. One of the other discrete noise components, the Rotating stall mechanism with its physical mechanism also explored in detail. Subsequently, two major phenomena of broadband noise components, turbulence and cavitation are explained. For cavitation, the phenomenon is elaborated in detail and the various methods explored by the researchers to predict existence of the cavitation phenomenon using acoustic spectrum. Conclusions are also drawn for each source by describing the major events. In the end, the possible future scope of work that can be explored is given.

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Effects of the staggered blades on unsteady pressure pulsations and flow structures of a centrifugal pump

Cited by 6 publications

References 35 publications

The influence of blade curvature radius on the internal unsteady characteristics of a centrifugal pump

The influence of blade curvature radius on the internal unsteady characteristics of a centrifugal pump

Effect of the number of guide vanes on cavitation characteristics and pressure pulsation of centrifugal pumps

Flow-induced noise sources and reduction methods in centrifugal pumps: A literature review

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