Research on the Hydrodynamic Noise Characteristics of a Mixed-Flow Pump

Author:

Yang Qiaoyue1,Li Wei12ORCID,Ji Leilei134,Shi Weidong5,Pu Wei1,Long Yu1,He Xinrui1

Affiliation:

1. National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China

2. Zhenjiang Fluid Engineering Equipment Technology Research Institute, Jiangsu University, Zhenjiang 212009, China

3. Key Laboratory of Fluid and Power Machinery, Xihua University, Ministry of Education, Chengdu 610039, China

4. Wenling Fluid Machinery Technology Institute, Jiangsu University, Wenling 317525, China

5. College of Mechanical Engineering, Nantong University, Nantong 226019, China

Abstract

This study presents a comprehensive investigation of the internal noise characteristics of a mixed-flow pump by combining computational fluid dynamics (CFD) and computational acoustics. The turbulent flow field of the pump is simulated using the unsteady SST k-ω turbulence model in CFD. The contributions of the volute, guide vanes, and impeller to the internal noise are analyzed and compared using the Lighthill theory, FW-H formula, and LMS Virtual Lab software for acoustic simulation. The research findings indicate that the energy of pressure fluctuations in the mixed-flow pump is predominantly concentrated at the blade passing frequency and its low-frequency harmonics. This suggests that the internal noise is mainly in the low-frequency range, with higher energy at the blade passing frequency and its harmonics. Under the 0.6Qdes flow condition, the flow inside the pump becomes more complex, resulting in higher sound pressure levels and sound power levels compared to higher flow conditions. However, for flow conditions ranging from 0.8Qdes to 1.2Qdes, the sound pressure levels gradually increase with increasing flow rate, with the sound pressure level at 1.0Qdes being nearly identical to that at 1.2Qdes. The analysis of sound power level spectra at different flow rates reveals that the distribution characteristics of internal vortex structures directly impact the hydrodynamic noise inside the mixed-flow pump. These research findings provide a significant theoretical basis for noise control in mixed-flow pumps.

Funder

Key International Cooperative research of the National Natural Science Foundation of China

National Natural Science Foundation of China

China Postdoctoral Science Foundation

Sixth “333 High Level Talented Person Cultivating Project” of Jiangsu Province

funded projects of “Blue Project” in Jiangsu Colleges and Universities

Jiangsu Funding Program for Excellent Postdoctoral Talent

open research subject of Key Laboratory of Fluid and Power Machinery

Ministry of Education

Jiangsu University

Publisher

MDPI AG

Subject

Ocean Engineering,Water Science and Technology,Civil and Structural Engineering

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