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Simulations and Experimental Investigations on the Acoustic Characterization of Centrifugal Pumps of Different Specific Speed

Chair of Fluidics, TU Dortmund University, 44227 Dortmund, Germany
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Author to whom correspondence should be addressed.
These authors contributed equally to this work.
This paper is an extended version of our paper in Proceedings of the 13th European Turbomachinery Conference on Fluid Dynamics & Thermodynamics ETC13, Lausanne, Switzerland, 8–12 April 2019. Paper No. 150.
Int. J. Turbomach. Propuls. Power 2019, 4(3), 16; https://doi.org/10.3390/ijtpp4030016
Received: 6 May 2019 / Accepted: 27 June 2019 / Published: 2 July 2019
Subject of discussion are simulations and experimental investigations on the acoustic characterization of three single stage centrifugal pumps of different specific speed. In operation, these pump-types generate pressure pulsation at blade passing frequency, primarily due to rotor-volute-interaction. In order to determine the acoustic excitation it is necessary to know about the pumps’ acoustic transmission parameters. In this paper, a one-dimensional numerical model for transient time-domain simulation is presented, which takes into account the pump geometry as well as the volutes’ structural behaviour by means of the local effective speed of sound. Numerical results for the transmission characteristics of the three different pumps are shown in terms of scattering matrices and evaluated against parameters calculated from measurement results. The experimental analyses are carried out using dynamic pressure sensors in both the suction and the discharge pipe. Assuming solely plane wave propagation, the complex acoustic field on each side is evaluated independently. The so called “two source” method is then used to determine the transmission parameters of the pumps in standstill for a range of frequencies experimentally. Subsequently, the acoustic excitation at varying rotational speed is evaluated by means of measurements at the pumps in operation and presented as monopole and dipole source types for cavitation-free conditions. View Full-Text
Keywords: centrifugal pump; pressure pulsation; acoustic transmission; scattering parameters; one-dimensional model centrifugal pump; pressure pulsation; acoustic transmission; scattering parameters; one-dimensional model
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Lehr, C.; Linkamp, A.; Aurich, D.; Brümmer, A. Simulations and Experimental Investigations on the Acoustic Characterization of Centrifugal Pumps of Different Specific Speed. Int. J. Turbomach. Propuls. Power 2019, 4, 16.

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