Numerical and experimental studies of hydraulic noise induced by surface dipole sources in a centrifugal pump

Liu, Houlin; Dai, Hanwei; Ding, Jian; Tan, Minggao; Wang, Yong; Huang, Hongyan

doi:10.1016/s1001-6058(16)60606-6

Cited by 23 publications

(13 citation statements)

References 14 publications

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“…Unstructured mesh, which has better adaptability to the geometry, is applied in the acoustic simulation. To guarantee the precision of the acoustic computation, the maximum mesh size should meet the Formula (21). In this study, the maximum mesh size is 0.008 m. And the mesh for acoustic simulation is shown in Figure 10.…”

Section: Mesh Generation and Boundary Conditionmentioning

confidence: 99%

“…However, the low-frequency noise induced by the fluid flow is very difficult to be eliminated. Recently, computational fluid dynamics were widely used to predict the flow-induced noise and analyze its corresponding sound source [20,21]. By employing the Lighthill's acoustic analogy theory, Howe [22] concluded that the dipoles source is the main source of the flow-induced noise in the centrifugal pump.…”

Section: Introductionmentioning

confidence: 99%

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Numerical and Experimental Investigation on Radiated Noise Characteristics of the Multistage Centrifugal Pump

Wang

Yuan

et al. 2019

Processes

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The radiated noise of the centrifugal pump acts as a disturbance in many applications. The radiated noise is closely related to the hydraulic design. The hydraulic parameters in the multistage pump are complex and the flow interaction among different stages is very strong, which in turn causes vibration and noise problems because of the strong hydraulic excitation. Hence, the mechanism of radiated noise and its relationship with hydraulics must be studied clearly. In order to find the regular pattern of the radiated noise at different operational conditions, a hybrid numerical method was proposed to obtain the flow-induced noise source based on Lighthill acoustic analogy theory, which divided the computational process into two parts: computational fluid dynamics (CFD) and computational acoustics (CA). The unsteady flow field was solved by detached eddy simulation using the commercial CFD code. The detailed flow information near the surface of the vane diffusers and the calculated flow-induced noise source was extracted as the hydraulic exciting force, both of which were used as acoustic sources for radiated noise simulation. The acoustic simulation employed the finite element method code to get the sound pressure level (SPL), frequency response, directivity, et al. results. The experiment was performed inside a semi-anechoic room with a closed type pump test rig. The pump performance and acoustic parameters of the multistage pump at different flow rates were gathered to verify the numerical methods. The computational and experimental results both reveal that the radiated noise exhibits a typical dipole characteristic behavior and its directivity varies with the flowrate. In addition, the sound pressure level (SPL) of the radiated noise fluctuates with the increment of the flow rate and the lowest SPL is generated at 0.8Qd, which corresponds to the maximum efficiency working conditions. Furthermore, the experiment detects that the sound pressure level of the radiated noise in the multistage pump rises linearly with the increase of the rotational speed. Finally, an example of a low noise pump design is processed based on the obtained noise characteristics.

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Section: Mesh Generation and Boundary Conditionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigation on Radiated Noise Characteristics of the Multistage Centrifugal Pump

Wang

Yuan

et al. 2019

Processes

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“…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. In addition, the pump structure modal response was considered to obtain more accurate results, Ding et al [25] studied the effect of different structures on SPL at BPF and provided guidance for structural optimization of centrifugal pumps.…”

Section: Introductionmentioning

confidence: 99%

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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“…Choi et al [4] reported that the noise generation is caused by the large scale flow field instability in a pump impeller. Recently, computational fluid dynamics (CFD) were widely used to elucidate and predict the hydro/aero acoustic generation [5,6]. Chu et al [7,8] numerically studied a centrifugal pump and reported that the vibration and radiation of noise is mainly determined by the unsteady flow characteristics in centrifugal pumps, which made a great contribution to settle flow-induced noise by CFD methods.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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Noise radiation is of importance for the performance of centrifugal pumps. Aiming at exploring noise radiation patterns of a typical centrifugal pump at different flow rates, a three-dimensional unsteady hydro/aero acoustic model with large eddy simulation (LES) closure is developed. Specifically, the Ffowcs Williams-Hawkings model (FW-H) is employed to predict noise generation by the impeller and volute. The simulated flow fields reveal that the interactions of the blades with the volute induce root mean square (RMS) pressure and further lead to noise radiation. Moreover, it is found that the profiles of total sound pressure level (TSPL) regarding the directivity field for the impeller-generated noise demonstrate a typical dipole characteristic behavior, whereas strictly the volute-generated noise exhibits an apparently asymmetric behavior. Additionally, the design operation (Here, 1 Q represents the design operation) generates the lowest TSPL vis-a-vis the off-design operations for all the flow rates studied. In general, as the flow rates decrease from 1 Q to 0.25 Q, TSPL initially increases significantly before 0.75 Q and then levels off afterwards. A similar trend appears for cases having the larger flow rates (1-1.25 Q). The TSPL deviates with the radiation directivity and the maximum is about 50%. It is also found that TSPL by the volute and the blades can reach~87 dB and~70 dB at most, respectively. The study may offer a priori guidance for the experimental set up and the actual design layout.Keywords: centrifugal pump; 3D flow field; varying flow rate; impeller and volute radiation noise; total sound pressure level (TSPL)

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Numerical and experimental studies of hydraulic noise induced by surface dipole sources in a centrifugal pump

Cited by 23 publications

References 14 publications

Numerical and Experimental Investigation on Radiated Noise Characteristics of the Multistage Centrifugal Pump

Numerical and Experimental Investigation on Radiated Noise Characteristics of the Multistage Centrifugal Pump

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

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

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