Abstract
The acoustic field distribution and evolution characteristics in a time domain inside a centrifugal pump are studied. During the fluid motion process, the acoustic source and acoustic pressure are basically less than 0, and the minimum value of the two parameters is distributed near the tongue. Additionally, the concentration, break, extend, migration and reaggregation phenomena of the minimum acoustic source region exist. Specifically, as the blade passes through the tongue, the minimum acoustic source region concentrates on the tongue firstly, then extends and migrates downstream slightly with the blade motion, and aggregates again around the tongue, which results in the similar evolution characteristics of acoustic pressure. Moreover, the standard deviation (STD) of acoustic source mainly focuses near the pressure side of blade tail and volute tongue, and the maximum STD is located at the tongue. Compared with the source component induced by stretching of the vortex, the source component induced by non-uniformity of fluid kinetic energy is closer to the overall acoustic source. Take the tongue as an example, at various rotational speeds, the STD proportions of the two components are about 5% and 95%, respectively. This study discusses the generation, distribution and evolution characteristics of acoustic field, which lays a foundation to analyze the acoustic field propagation mechanism of centrifugal pumps.
Highlights
Nowadays, turbomachinery plays a pivotal role in many fields of national economy [1,2,3]
To analyze the propagation characteristics of sound wave in centrifugal pumps based on synergy principle by using Computational Fluid Dynamics (CFD), the basic and crucial step is to solve the parameters of flow and acoustic fields simultaneously, and figure out the temporal distribution and evolution characteristics of acoustic field
The effectiveness of the numerical simulation approach combining discretizing and solving the Powell vortex sound equation with CFD is verified by experiment
Summary
Turbomachinery plays a pivotal role in many fields of national economy [1,2,3]. Experiments have been conducted for the centrifugal pump noise analysis, and valuable conclusions were obtained [4,5,6,7] It was difficult for the experimental method to identify the acoustic source accurately and analyze the coupling between flow and acoustic fields, by comparison, the numerical simulation approach was an ideal method to solve these issues. By summarizing the current research results, it is seen that the main concern is the effect of operation condition and pump structure on the noise distribution characteristics, while the acoustic field propagation mechanism in centrifugal pumps is rarely involved. To analyze the propagation characteristics of sound wave in centrifugal pumps based on synergy principle by using CFD, the basic and crucial step is to solve the parameters of flow and acoustic fields simultaneously, and figure out the temporal distribution and evolution characteristics of acoustic field. This study could guide the further research about the propagation mechanism of acoustic field
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