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Energies 2017, 10(2), 221; doi:10.3390/en10020221

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

1
School of Energy and Power Engineering, Shandong University, Jinan 250061, China
2
School of Mechanical and Mining Engineering, University of Queensland, Brisbane 4067, Australia
3
Thermal Management Research Group, Efficient Energy Transfer (ηET) Department, Bell Labs Ireland, Nokia, Dublin D15 Y6NT, Ireland
4
School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester M60 1QD, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Bjørn H. Hjertager
Received: 1 December 2016 / Revised: 7 February 2017 / Accepted: 8 February 2017 / Published: 14 February 2017
(This article belongs to the Special Issue Engineering Fluid Dynamics)
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Abstract

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. View Full-Text
Keywords: centrifugal pump; 3D flow field; varying flow rate; impeller and volute radiation noise; total sound pressure level (TSPL) centrifugal pump; 3D flow field; varying flow rate; impeller and volute radiation noise; total sound pressure level (TSPL)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Gao, M.; Dong, P.; Lei, S.; Turan, A. Computational Study of the Noise Radiation in a Centrifugal Pump When Flow Rate Changes. Energies 2017, 10, 221.

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