Investigation on the vibration and flow instabilities induced by cavitation in a centrifugal pump

Lu, Jiaxing; Yuan, Shouqi; Parameswaran, Siva; Yuan, Jianping; Ren, Xudong; Si, Qiaorui

doi:10.1177/1687814017696225

Cited by 26 publications

(18 citation statements)

References 28 publications

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“…. (8) where the C e and C c represent the empirical constants of the evaporation and condensation, respectively. R B is the radius of vapor bubble, α nuc is the volume fraction of noncondensable gas, and p v is the saturation pressure of the water at the local temperature.…”

Section: Numerical Simulationmentioning

confidence: 99%

“…Due to the rise of safety concerns, however, the vibration caused by the pump has been largely investigated over the past decades. In the references, the research on the vibration produced by centrifugal pumps has focused mainly on the inner flow [1][2][3], the hydraulic excitation force [4,5], the rotation of the rotor [6], the impacts of the tongue [7], the cavitation [8], the bearing fault, and other troubles of the system [9]. It is well known that even under the noncavitation condition, flow instabilities exist in the centrifugal pump when the flow rate changes.…”

Section: Introductionmentioning

confidence: 99%

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Detection of the Flow State for a Centrifugal Pump Based on Vibration

Liu

Zeng

et al. 2019

Energies

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A combined numerical and experimental method study was performed to detect the inner flow state for a type of centrifugal pump. It was found that the inlet attack angles of blades in an impeller have a great influence on the flow instabilities in a centrifugal pump. The mechanism of the rotating stall in the impeller channel was explained. Meanwhile, flow state identification with vibration (FSIV) was proposed to detect the flow instabilities in a centrifugal pump. The relationship between the external vibration and the inner flow state has been established by FSIV. The characteristics and mechanism of the vibration produced by the flow instabilities in a centrifugal pump were investigated. It was found that the hump, the rotating stall, the backflow, the occurrence of unstable flow, and the cavitation in the centrifugal pump can be effectively detected by applying the vibration signals, which helps to obtain safe and steady operating conditions for the system.

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Section: Numerical Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Detection of the Flow State for a Centrifugal Pump Based on Vibration

Liu

Zeng

et al. 2019

Energies

Self Cite

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“…This damage causes corrosion of the impeller as well as vibration and noise. 1,2 This phenomenon is referred to as cavitation. Cavitation is greatly harmful to the flow of the fluid, which directly affects the performance and lifetime of a pump.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the cavitation phenomenon for the head drop and unsteady bubble patterns with a difference in the incidence angle of a mixed-flow pump

Kim

Yang

Suh

et al. 2020

Advances in Mechanical Engineering

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In this study, two types of mixed-flow pump models exhibiting different suction performances were investigated to understand the cavitation characteristics of head drop gradients due to the decrease in inlet pressure. Both models were designed with the same specifications except for the shroud inlet blade angle and inlet radius which directly affect the incidence angle. The steady- and unsteady-state analyses were performed using ANSYS CFX, and the results of both models were compared. Bubble generation and patterns were systemically represented at the design flow rate to observe their influence on suction performance. Furthermore, experimental tests were performed to validate the numerical results. From the results, the head drop gradient can determine the suction performance of mixed-flow pumps. The amount and shape of the bubbles concerning the suction performance of a mixed-flow pump exhibit significant differences with the changes in time and inlet pressure. The patterns of generated bubble are not stable even for each blade.

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“…The structural instability that was induced by pressure pulsation and external force in nuclear power reactors, fuel pumps, air conditioning systems, and heat exchanger tubes has received increasing attention in recent years [1][2][3][4][5][6]. Nuclear fuel rod bundles that were exposed to coolant flow should be protected from structural failure [7].…”

Section: Introductionmentioning

confidence: 99%

Flexural Vibration Analysis of Nuclear Fuel Rod Bundles Interacting with Surrounding Fluid Subjected to Pressure Wave

2020

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The structural behavior of the nuclear rod bundles that consisted of cylindrical beams was predicted using the spectral element method (SEM) while considering the interaction with the surrounding fluid. Viscous fluid behavior was utilized in order to calculate the forces acting on the nuclear rod bundles from the incident pressure waves. The added mass and fluid coupling on the nuclear rod bundles were determined for the position patterns and gaps of each of the cylindrical beams. The pressure field from propagating waves in the surrounding fluid was calculated with respect to the boundary conditions of the surface of the vibrating structures. With the increasing number of nuclear rods and decreasing pressure wavelengths, the structural vibration of the nuclear rod bundles that were induced by the propagating forces affected the scattering events of the pressure field. The frequency response of the nuclear rod bundles from the pressure waves in the water exhibited smaller damping, because the incident pressure wave travels without fluid coupling due to the longer wavelength when compared with distance between rods. The proposed numerical method can be utilized for the detailed design for effective parameters of a supporting system to reduce the vibration of nuclear fuel rod bundles for safety control.

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Investigation on the vibration and flow instabilities induced by cavitation in a centrifugal pump

Cited by 26 publications

References 28 publications

Detection of the Flow State for a Centrifugal Pump Based on Vibration

Detection of the Flow State for a Centrifugal Pump Based on Vibration

Numerical study on the cavitation phenomenon for the head drop and unsteady bubble patterns with a difference in the incidence angle of a mixed-flow pump

Flexural Vibration Analysis of Nuclear Fuel Rod Bundles Interacting with Surrounding Fluid Subjected to Pressure Wave

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