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Experimental investigation of the preferred Strouhal number used in self-resonating pulsed waterjet

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Abstract

Self-resonating pulsed waterjet (SRPW) is superior to plain waterjet in many ways and is being employed in numerous applications. To further improve the performance of SRPW, the optimal value of the preferred Strouhal number (Sd), which is used to determine the chamber length of a self-resonating nozzle, was experimentally studied at inlet pressures of 10 MPa and 20 MPa. The axial pressure oscillation peak and amplitude were used to evaluate the performance of SRPW, in order to find the optimum Sd value. Results show that Sd value determines the self-resonance behavior of an organ-pipe nozzle and greatly affects the intensity of the axial pressure oscillation. Under the experimental conditions, the optimum Sd values are 0.315 and 0.278 respectively, corresponding to inlet pressures of 10 MPa and 20 MPa. Compared with the default value of 0.3 obtained from air jet experiment, the optimum Sd value at inlet pressure of 10 MPa is a little larger and oppositely a bit smaller at inlet pressure of 20 MPa. Thus, if the inlet pressure is not considered, Sd value of 0.3 is reasonable for determining the chamber length of a self-resonating nozzle for generating effective SRPW.

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Authors and Affiliations

  1. School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei Province, China

    Deng Li & Youping Chen

  2. School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, Hubei Province, China

    Deng Li, Yong Kang, Zu’An Wang, Xiaoliang Wang, Qi Fan & Miao Yuan

Authors
  1. Deng Li
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  2. Youping Chen
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  3. Yong Kang
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  4. Zu’An Wang
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  5. Xiaoliang Wang
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  6. Qi Fan
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  7. Miao Yuan
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Corresponding author

Correspondence to Youping Chen.

Additional information

Recommended by Associate Editor Sangyoup Lee

Deng Li received his B.S. and Ph.D. degrees from Wuhan University, China, in 2012, and 2017. He is now doing postdoctoral research at Huazhong University of Science and Technology, China.

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Li, D., Chen, Y., Kang, Y. et al. Experimental investigation of the preferred Strouhal number used in self-resonating pulsed waterjet. J Mech Sci Technol 32, 4223–4229 (2018). https://doi.org/10.1007/s12206-018-0820-6

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  • DOI: https://doi.org/10.1007/s12206-018-0820-6

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