Relationship Between Unsteady Flow, Pressure Fluctuations, and Noise in a Centrifugal Pump—Part B: Effects of Blade-Tongue Interactions

Chu, Shigan; Dong, R.; Katz, Joseph

doi:10.1115/1.2816814

Cited by 96 publications

(65 citation statements)

References 4 publications

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“…Dong et al [15] and Chu et al [16] used PIV measurement and found that jet-wake structures and pulsating flow near impeller exit. The orientation of the blades could affect the leakage and the pressure distribution.…”

Section: Introductionmentioning

confidence: 99%

Unsteady Analysis of Impeller-Volute Interaction in Centrifugal Pump

Cheah¹,

Lee²,

Winoto³

2011

International Journal of Fluid Machinery and Systems

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An unsteady numerical analysis has been carried out to study the strong impeller volute interaction of a centrifugal pump with six backward swept blades shrouded impeller. The numerical analysis is done by solving the threedimensional Reynolds Averaged Navier-Stokes codes with standard k-ε two-equations turbulence model and wall regions are modeled with a scalable log-law wall function. The flow within the impeller passage is very smooth and following the curvature of the blade in stream-wise direction. However, the analysis shows that there is a recirculation zone near the leading edge even at design point. When the flow is discharged into volute casing circumferentially from the impeller outlet, the high velocity flow is severely distorted and formed a spiraling vortex flow within the volute casing. A spatial and temporal wake flow core development is captured dynamically and shows how the wake core diffuses. Near volute tongue region, the impeller/volute tongue strong interaction is observed based on the periodically fluctuating pressure at outlet. The results of existing analysis also proved that the pressure fluctuation periodically is due to the position of impeller blade relative to tongue.

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Section: Introductionmentioning

confidence: 99%

Unsteady Analysis of Impeller-Volute Interaction in Centrifugal Pump

Cheah¹,

Lee²,

Winoto³

2011

International Journal of Fluid Machinery and Systems

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“…Dong et al [11] and Chu et al [12] used PIV measuring the velocity within the volute of a centrifugal pump at different impeller blade orientations, on and off-design conditions to study effect of impeller/volute tongue interaction. They found that jet-wake structures and pulsating flow near impeller exit.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Inlet and Impeller Flow Structures in Centrifugal Pump at Design and Off-design Points

Cheah

Lee

S.H

2011

International Journal of Fluid Machinery and Systems

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The objective of present work is to use numerical simulation to investigate the complex three-dimensional and secondary flow structures developed at the inlet and impeller in a centrifugal pump at design and off-design points. The pump impeller is shrouded with 6 backward swept blades and with a specific speed of 0.8574. The characteristic of the pump is measured experimentally with straight and curved intake sections. Numerical computation is carried out to investigate the pump inlet flow structures and subsequently the flow field within the centrifugal pump. The numerical results showed that strong interaction between the impeller eye and intake section. Secondary flow structure occurs upstream at the pump inlet has great influence on the pump performance and flow structure within the impeller.

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“…This proves that the change of rotational speed would affect the acoustic energy, but it has little impact on the acoustic energy distribution. According to the past research [5][6][7], the volute tongue is the major noise source, and the measurement interval in the direction facing the tongue is closer to the tongue than other intervals. On the other hand, acoustic energy weakens gradually as the distance from the sound source increases, so the acoustic energy has less attenuation in the direction facing the tongue than that in the direction against the tongue, causing a much higher ratio of acoustic energy in the direction facing the tongue.…”

Section: Directivity Characteristic Of Radiation Noise Under Various mentioning

confidence: 99%

“…Choi et al [4] conducted experiments and revealed that the main cause of radiation noise generated by an impeller without volute was the pressure fluctuation on the blade surface. Chu et al [5,6] took the volute into consideration and attributed the primary noise to the interaction between the non-uniform outflux from the impeller and tongue [5,6], and further research showed that a slight increase of the gap between impeller and tongue would reduce the noise significantly [7]. Parrondo et al [8] established an acoustic model to characterize the internal sound field at low frequency range, and concluded that the internal sound field could be characterized by a dipole-like source near the tongue.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on the Radiation Noise Characteristics of a Centrifugal Pump with Various Working Conditions

Guo

Gao

et al. 2017

Energies

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Abstract:To investigate the radiation noise characteristics of a centrifugal pump under various working conditions, a noise measurement system is established; afterwards, the distribution of different points and intervals, as well as the overall level of noise, are studied. The total sound pressure level distribution for different points manifests the dipole and asymmetric directivity characteristics. Additionally, the acoustic energy is introduced to compare the noise of different intervals to reveal the asymmetric characteristics, and it is found that variation in working conditions has little impact on the acoustic energy distribution, and the ratio of the acoustic energy in the direction facing the tongue, as well as that in the direction against the tongue, to total acoustic energy fluctuate around 0.410 and 0.160, respectively, under various working conditions. Also, the A-weighted average sound pressure level (L pA ) is applied to describe the overall level of noise, and L pA increases gradually with the growth of rotational speed, but the growth slope decreases. While in the operation of throttling regulation, L pA shows the trend that first increases, then remains stable, and increases again with the growth of flow rate. This study could provide guidance for optimizing the operating conditions and noise control of centrifugal pumps.

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Relationship Between Unsteady Flow, Pressure Fluctuations, and Noise in a Centrifugal Pump—Part B: Effects of Blade-Tongue Interactions

Cited by 96 publications

References 4 publications

Unsteady Analysis of Impeller-Volute Interaction in Centrifugal Pump

Unsteady Analysis of Impeller-Volute Interaction in Centrifugal Pump

Numerical Study of Inlet and Impeller Flow Structures in Centrifugal Pump at Design and Off-design Points

An Experimental Study on the Radiation Noise Characteristics of a Centrifugal Pump with Various Working Conditions

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