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Open AccessProceedings

Experimental Investigation on the Acoustic Scattering Matrix for a Centrifugal Pump

by Guidong Li 1,2, Jorge Parrondo 1,* and Yang Wang 2
1
Department of Energy, University of Oviedo, Campus de Viesques s/n, 33271 Gijón, Asturias, Spain
2
National Research Center of Pumps, Jiangsu University, Xuefu Road No. 301, Zhenjiang 212013, Jiangsu, China
*
Author to whom correspondence should be addressed.
Presented at the 2nd International Research Conference on Sustainable Energy, Engineering, Materials and Environment (IRCSEEME), Mieres, Spain, 25–27 July 2018.
Proceedings 2018, 2(23), 1489; https://doi.org/10.3390/proceedings2231489
Published: 1 November 2018
Fluid-dynamic noise in centrifugal pumps as a significant sound source in piping systems has gained high attention due to the requirements of vibration and noise reduction in many fields. The acoustic characteristics of the fluid-dynamic noise from pumps are bound to be affected by the pipe ports and other piping components during the operation of the pump system. Therefore, the direct measurement of pressure pulsations in the pipeline of a test pump does not directly reflect the acoustic properties of the pump itself, because the coupling effects of the hydraulic system, which can even cause standing waves, may be seriously misleading in some situations. In this paper, an alternative experimental method has been applied to identify the so-called acoustic scattering matrix of a laboratory centrifugal pump. The elements of the scattering matrix characterize how the acoustic pressure waves are transmitted or reflected from the pump ports, i.e., it summarizes the passive acoustic properties of the pumps. For the tests, the test pump was connected in parallel to another auxiliary pump driven with a variable-frequency that played the role of an external sound source. The acoustic pressure waves induced in the suction and discharge pipes were mathematically decomposed into the corresponding incoming and exiting pressure waves travelling in the positive (P+) and negative (P) directions respectively, by means of the two-microphone procedure. This paper shows the elements of the scattering matrix determined for the test pump as a function of frequency. These results represent a reference for subsequent theoretical research on the acoustic scattering matrix of centrifugal pumps.
Keywords: centrifugal pump; pressure signals; acoustic two-port model; pump scattering matrix centrifugal pump; pressure signals; acoustic two-port model; pump scattering matrix
MDPI and ACS Style

Li, G.; Parrondo, J.; Wang, Y. Experimental Investigation on the Acoustic Scattering Matrix for a Centrifugal Pump. Proceedings 2018, 2, 1489.

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