Computational Study of the Noise Radiation in a Centrifugal Pump When Flow Rate Changes

Gao, Ming; Dong, Peixin; Lei, Shenghui; Turan, Ali

doi:10.3390/en10020221

Cited by 26 publications

(18 citation statements)

References 17 publications

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“…The noise generation by the blades as well as from the volute of centrifugal pump was captured using FW-H model and found to be well agreed with experimental findings [9].…”

Section: Introductionmentioning

confidence: 48%

Study of Flow Induced Noise in Vertical Inline Pump Using Lighthill Analogy

Stephen

Yuan

Pei

et al. 2018

MATEC Web of Conferences

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Abstract. The pump user demands for specification along with noise and vibration magnitude for extreme operating conditions apart from best efficiency flow. In order to predict the noise level in pumps, the entire unit of pump has to be considered for acoustic evaluation. Hence, the full three dimensional model of vertical inline pump which consists of inlet pipe, impeller, and volute casing is considered for detailing the flow induced noise using Lighthill analogy. The performance characteristics of pump are well matched between experimental and computational results and the overall sound power level at best efficiency flow using computation was compared with empirical relations and found to be agreed well. The streamline patterns along the inlet pipe shows the effects of recirculation and return flow at partload condition and confirm that the utilization of flow passage is not well streamlined even for nominal flow rate. Further, the detailed study of inlet pipe cross sections reveals the nature of different noise sources such as dipole and quadrupole sound levels along with Proudman source power level. The intensity of turbulence and vortices in flow passage is predicted well using quadrupole source and Proudman sound power levels.

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“…The noise generation by the blades as well as from the volute of centrifugal pump was captured using FW-H model and found to be well agreed with experimental findings [9].…”

Section: Introductionmentioning

confidence: 48%

Study of Flow Induced Noise in Vertical Inline Pump Using Lighthill Analogy

Stephen

Yuan

Pei

et al. 2018

MATEC Web of Conferences

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“…The dipole source was defined as an unsteady fluid force acting on the wall surface, including the impeller dipole source and the volute dipole source in centrifugal pumps. The impeller-generated radiation noise at BPF exhibited obvious dipole characteristic behavior [22], while the volute-generated radiation noise clearly showed asymmetric directivity characteristics, i.e., the radiation noise in the direction facing the tongue was higher than that in the direction against the tongue [23]. Liu et al [24] also validated the important impact of the pump cavity dipole source on calculation results.…”

Section: Introductionmentioning

confidence: 84%

Experimental Study on Radiation Noise Frequency Characteristics of a Centrifugal Pump with Various Rotational Speeds

Guo

Gao

et al. 2018

Applied Sciences

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Abstract:To investigate the radiation noise frequency characteristics of a centrifugal pump under various rotational speeds, a noise measurement system was established in a soundproof room. Sixteen monitoring points were evenly arranged in a circumferential direction around the pump and the sound pressure levels (SPLs) at different monitoring points were measured by a microphone, then the changing patterns of radiation noise in a wide frequency range and at certain frequencies were studied. The results reveal that the SPLs reach a maximum between 1000 and 2000 Hz, while SPLs are lower in other frequency ranges. Additionally, the acoustic energy was introduced to determine the proportion of radiation noise in different frequency ranges to overall noise. When rotational speed increases from 1700 to 2900 rpm, the proportion of acoustic energy between 1000 and 2000 Hz is higher than 0.50 and shows an increasing trend. Meanwhile, the proportion between 0 and 1000 Hz is about 0.30 and decreases gradually, while that between 2000 and 8000 Hz is about 0.12 and shows little change. Also, the increase in radiation noise at high frequency is higher than that at low frequency. This study could provide theoretical guidance for research regarding radiation noise prediction and control technology at different frequencies of centrifugal pumps.

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“…The noise induced by unstable flow and cavitation are mainly caused by inducers and turbopumps, which have rather high rotation speeds [8,9]. Some attention is also paid to the numerical study of the noise induced by flow in centrifugal pumps, which presents the acoustic properties of the flows [10][11][12]. The hydraulic noise caused by diffuser pumps and volute is theoretically investigated by Clark, who finds that although the noise generated by the pump casing is weak, the blade wake and blade circulation are of prime…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Noise Induced by Unstable Flow in a Centrifugal Pump

Liu

Zeng

et al. 2020

Energies

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In order to investigate the mechanism and the characteristics of the noise induced by unstable flow in a centrifugal pump, the internal flow characteristics in the pump were numerically researched, and the acoustic pressure fluctuations at the pump inlet and outlet were experimentally investigated. Obvious corresponding relationships between the flow instabilities, the cavitation and the noise were established. It was found that the rotating stall, the backflow, the hump, the occurrence of unstable flow and the cavitation in such a centrifugal pump were effectively detected through the noise, which could help to provide fundamental information on flow instabilities and guarantee safe and steady operating conditions for the system. The recirculation and prewhirl regions in the pump upstream pipe, which were caused by the backflow and the rotation of the impeller, presented the circumferential movement with a spiral shape, causing apparent broadband fluctuations at low frequency band of the acoustic pressure. The backflow and rotating stall could also result in broadband fluctuations of the pump outlet noise, which was distributed from 100 Hz to 150 Hz. Meanwhile, the broadband fluctuations of the pump outlet acoustic pressure distributed in the low frequency range, which was produced by the occurrence of cavitation, moved to the lower frequency band as the flow rate increased. The enhanced broadband fluctuations of the pump inlet and outlet noise distributed from 1 kHz to 6 kHz were caused by the coupling between the cavitation-induced noise and the system-produced noise. The broadband fluctuations of the pump inlet noise distributed between 6 kHz and 9 kHz were regarded as the typical frequency band of cavitation in the centrifugal pump.

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Computational Study of the Noise Radiation in a Centrifugal Pump When Flow Rate Changes

Cited by 26 publications

References 17 publications

Study of Flow Induced Noise in Vertical Inline Pump Using Lighthill Analogy

Study of Flow Induced Noise in Vertical Inline Pump Using Lighthill Analogy

Experimental Study on Radiation Noise Frequency Characteristics of a Centrifugal Pump with Various Rotational Speeds

Investigation of the Noise Induced by Unstable Flow in a Centrifugal Pump

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