A numerical study of flow-induced noise in a two-dimensional centrifugal pump. Part II. Hydroacoustics

Langthjem, Mikael A.; Olhoff, Niels

doi:10.1016/j.jfluidstructs.2004.01.002

Cited by 62 publications

(34 citation statements)

References 20 publications

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“…Further it was confirmed that the main source of noise generation from pumps is from vane tongue interaction [3,4]. The detection of noise radiation from the two dimensional model of centrifugal pump was analyzed by Langthjem et al [5] using Lighthill acoustic analogy and concludes that there was a good agreement between numerical and experimental readings. Jiang et al [6] studied the feasible method to couple fluid structure interaction with flow induced noise in turbomachines using Large Eddy Simulation (LES) based CFD and FEM.…”

Section: Introductionmentioning

confidence: 93%

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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Section: Introductionmentioning

confidence: 93%

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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“…A hybrid method combining CFD with Lighthill acoustic analogy has been widely used to elucidate and predict acoustic generation [17][18][19]. Langthjem et al [20,21] applied it for noise calculation in a two-dimensional centrifugal pump and concluded that the main noise source was the dipole source. 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.…”

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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“…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. More recently, Langthjem et al [9,10] employed Lighthill's acoustic analogy to predict the radiation of noise for a centrifugal pump based on the 2D flow field. Kato et al [11,12] reported pressure fluctuation levels on the volute wall using large eddy simulation (LES) in a finite element formulation.…”

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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A numerical study of flow-induced noise in a two-dimensional centrifugal pump. Part II. Hydroacoustics

Cited by 62 publications

References 20 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

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

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