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Investigation of the Noise Induced by Unstable Flow in a Centrifugal Pump

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  • Jiaxing Lu

    (Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University, Chengdu 610039, China
    Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China)

  • Xiaobing Liu

    (Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University, Chengdu 610039, China)

  • Yongzhong Zeng

    (Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University, Chengdu 610039, China)

  • Baoshan Zhu

    (Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China)

  • Bo Hu

    (Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China)

  • Hong Hua

    (Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University, Chengdu 610039, China)

Abstract

In order to investigate the mechanism and the characteristics of the noise induced by unstable flow in a centrifugal pump, the internal flow characteristics in the pump were numerically researched, and the acoustic pressure fluctuations at the pump inlet and outlet were experimentally investigated. Obvious corresponding relationships between the flow instabilities, the cavitation and the noise were established. It was found that the rotating stall, the backflow, the hump, the occurrence of unstable flow and the cavitation in such a centrifugal pump were effectively detected through the noise, which could help to provide fundamental information on flow instabilities and guarantee safe and steady operating conditions for the system. The recirculation and prewhirl regions in the pump upstream pipe, which were caused by the backflow and the rotation of the impeller, presented the circumferential movement with a spiral shape, causing apparent broadband fluctuations at low frequency band of the acoustic pressure. The backflow and rotating stall could also result in broadband fluctuations of the pump outlet noise, which was distributed from 100 Hz to 150 Hz. Meanwhile, the broadband fluctuations of the pump outlet acoustic pressure distributed in the low frequency range, which was produced by the occurrence of cavitation, moved to the lower frequency band as the flow rate increased. The enhanced broadband fluctuations of the pump inlet and outlet noise distributed from 1 kHz to 6 kHz were caused by the coupling between the cavitation-induced noise and the system-produced noise. The broadband fluctuations of the pump inlet noise distributed between 6 kHz and 9 kHz were regarded as the typical frequency band of cavitation in the centrifugal pump.

Suggested Citation

  • Jiaxing Lu & Xiaobing Liu & Yongzhong Zeng & Baoshan Zhu & Bo Hu & Hong Hua, 2020. "Investigation of the Noise Induced by Unstable Flow in a Centrifugal Pump," Energies, MDPI, vol. 13(3), pages 1-22, January.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:3:p:589-:d:313634
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    References listed on IDEAS

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    1. Mao, Xiuli & Pavesi, Giorgio & Chen, Diyi & Xu, Hengshan & Mao, Gaojun, 2019. "Flow induced noise characterization of pump turbine in continuous and intermittent load rejection processes," Renewable Energy, Elsevier, vol. 139(C), pages 1029-1039.
    2. Chang Guo & Ming Gao & Dongyue Lu & Kun Wang, 2017. "An Experimental Study on the Radiation Noise Characteristics of a Centrifugal Pump with Various Working Conditions," Energies, MDPI, vol. 10(12), pages 1-14, December.
    3. Ming Gao & Peixin Dong & Shenghui Lei & Ali Turan, 2017. "Computational Study of the Noise Radiation in a Centrifugal Pump When Flow Rate Changes," Energies, MDPI, vol. 10(2), pages 1-11, February.
    4. Lei Tan & Baoshan Zhu & Shuliang Cao & Yuchuan Wang & Binbin Wang, 2014. "Influence of Prewhirl Regulation by Inlet Guide Vanes on Cavitation Performance of a Centrifugal Pump," Energies, MDPI, vol. 7(2), pages 1-16, February.
    5. Jiaxing Lu & Xiaobing Liu & Yongzhong Zeng & Baoshan Zhu & Bo Hu & Shouqi Yuan & Hong Hua, 2019. "Detection of the Flow State for a Centrifugal Pump Based on Vibration," Energies, MDPI, vol. 12(16), pages 1-18, August.
    6. Xiaoke He & Yingchong Zhang & Chuan Wang & Congcong Zhang & Li Cheng & Kun Chen & Bo Hu, 2020. "Influence of Critical Wall Roughness on the Performance of Double-Channel Sewage Pump," Energies, MDPI, vol. 13(2), pages 1-20, January.
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    1. Yuan, Zhiyi & Zhang, Yongxue & Zhang, Jinya & Zhu, Jianjun, 2021. "Experimental studies of unsteady cavitation at the tongue of a pump-turbine in pump mode," Renewable Energy, Elsevier, vol. 177(C), pages 1265-1281.

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