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Effect of the volute tongue cut on pressure pulsations of a low specific speed centrifugal pump

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Abstract

The volute tongue, as the crucial component inducing rotor-stator interaction, is detrimental to unsteady pressure pulsations of centrifugal pumps. In the present paper, to investigate the effect of the volute tongue cut on pressure pulsations of a low specific speed centrifugal pump, three volute tongues are obtained through twice cuts, named cases 1, 2, 3. Twenty measuring points are evenly mounted on periphery of the volute casing to obtain unsteady pressure signals using high response transducers. Pressure amplitudes at the blade passing frequency fBPF and root mean square (rms) values in 0 Hz-500 Hz frequency band are applied to evaluate the cutting effect. Results show that pressure spectrum is significantly affected by the volute tongue cut, especially for the component at fBPF. For different measuring points, influences of the volute tongue cut on three cases are not identical. From rms values, it is evident that cutting the volute tongue will lead to pressure energy increasing for most of the concerned measuring points, especially for the points at the far away region from the volute tongue. Finally, from comparison with the original shape case 1, the averaged increment of the twenty points is more than 20%. So it is concluded that for this type centrifugal pump, cutting the volute tongue is not reasonable considering low pressure pulsation requirement.

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Acknowledgements

This work was supported by the Natural Science Foundation of Jiangsu Province (Grant No. BK20170547), the China Scholarship Council (CSC), the “Six Talent Peaks” in Jiangsu province (Grant No. KTHY-060) and the Open Research Subject of Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University (Grant No. szjj2017-096).

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Authors and Affiliations

  1. School of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, China

    Ning Zhang & Bo Gao

  2. School of Mechanical Technology, Wuxi Institute of Technology, Wuxi, 214121, China

    Bin Xia

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

    Qi-feng Jiang

Authors
  1. Ning Zhang
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  2. Bo Gao
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  3. Bin Xia
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  4. Qi-feng Jiang
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Correspondence to Qi-feng Jiang.

Additional information

Project supported by the National Natural Science Foundation of China (Grant Nos. 51706086, 51576090).

Biography: Ning Zhang (1987-), Male, Ph. D.

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Zhang, N., Gao, B., Xia, B. et al. Effect of the volute tongue cut on pressure pulsations of a low specific speed centrifugal pump. J Hydrodyn 32, 758–770 (2020). https://doi.org/10.1007/s42241-020-0053-x

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  • DOI: https://doi.org/10.1007/s42241-020-0053-x

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