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Numerical study of coupled flow in blocking pulsed jet impinging on a rotating wall

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Abstract

In order to study the complex unsteady flow characteristics of pulsed jet impinging on a rotating wall, the Wray–Agarwal turbulence model was adopted. The following conditions were used to simulate the internal flow mechanism, namely: jet with Re = 10,000; rotational speed n = 500 rpm; impinging height H/D = 5; pulse period T = 0.5 s + 0.5 s. The results show that: (1) The flow field structure of pulsed jet impinging the rotating wall is symmetrical about the jet axis. With the development of time, a pair of entrainment vortices and rotating vortices are formed on both sides of the jet and on the rotating wall, respectively. (2) In the vicinity of the jet outlet, the radial distribution of the velocity V gradually becomes non-uniform as time progresses and eventually coincides with the velocity at steady state. (3) During 0 s ≤ t < 0.5 s, the velocity at nozzle-exit increases with time, and the V/Vj along the axis coincides with the steady state. During 0.5 s ≤ t < 1 s, the nozzle-exit velocity V/Vj decreases to 0, along the axis direction, the V/Vj increase first and then decrease. (4) The impact pressure of pulsed jet on the impact wall is greater than that of continuous jet on the impact wall in a certain period when water hammer effect occurs.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 51979240 and 51609105).

Funding

This research was funded by the National Natural Science Foundation of China (No. 51979240 and 51609105).

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Authors and Affiliations

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

    Li Zhang, Yingchong Zhang & Weidong Shi

  2. Hainan Vocational University of Science and Technology, Haikou, 571126, Hainan Province, China

    Chuan Wang

  3. College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, 225009, Jiangsu Province, China

    Chuan Wang

  4. Jiangsu Haishi Pump Manufacturing Co., Ltd, Taizhou, 214500, Jiangsu Province, China

    Wei Xiang

  5. Department of Mechanical Engineering, Texas Tech University, Lubbock, TX, 79411, USA

    Zhaoming He

  6. School of Mechanical Engineering, Nantong University, Nantong, 226000, Jiangsu Province, China

    Weidong Shi

Authors
  1. Li Zhang
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  3. Yingchong Zhang
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  4. Wei Xiang
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Contributions

Writing—original draft, L.Z.; conceptualization, L.Z. and C.W.; formal analysis, Y.Z.; Data curation, W.X.; writing—review and editing, W.S.; supervision, W.S. and Z.H. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Chuan Wang or Weidong Shi.

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Technical Editor: Daniel Onofre de Almeida Cruz.

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Zhang, L., Wang, C., Zhang, Y. et al. Numerical study of coupled flow in blocking pulsed jet impinging on a rotating wall. J Braz. Soc. Mech. Sci. Eng. 43, 508 (2021). https://doi.org/10.1007/s40430-021-03212-0

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  • DOI: https://doi.org/10.1007/s40430-021-03212-0

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