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Effects of area discontinuity at nozzle inlet on the characteristics of self-resonating cavitating waterjet

  • Fluid and Power Machinery
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Abstract

The current research on self-resonating cavitating waterjet(SRCW) mainly focuses on the generation mechanism and structure optimization. Researches relating to the influences of disturbances at nozzle inlet on the characteristics of the jet are rarely available. In order to further improve the performance of SRCW, effects of area discontinuity(enlargement and contraction) are experimentally investigated using three organ-pipe nozzles. Axial pressure oscillation peak and amplitude as well as aggressive erosion intensity of the jet are used to evaluate the effects. The results reveal that area enlargement and contraction affect the peak differently, depending on the inlet pressure, nozzle geometry, and standoff distance; while area contraction always improves the amplitude regardless of these factors. At inlet pressures of 10 MPa and 20 MPa, area discontinuity improves the peak at almost all the testing standoff distances, while this only happens at smaller standoff distances with the inlet pressure increased to 30 MPa. The capability of area discontinuity for improving the amplitude is enhancing with increasing inlet pressure. Moreover, the cavitation erosion ability of the jet can be largely enhanced around the optimum standoff distance, depending on the type of area discontinuity and nozzle geometry. A preliminary analysis of the influence of area discontinuity on the disturbance waves in the flow is also performed. The proposed research provides a new method for effectively enhancing the performance of SRCW.

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Author information

Authors and Affiliations

  1. School of Power and Mechanical Engineering, Wuhan University, Wuhan, 430072, China

    Deng Li, Yong Kang, Xiaolong Ding, Xiaochuan Wang & Zhenlong Fang

  2. Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan, 430072, China

    Deng Li, Yong Kang, Xiaolong Ding, Xiaochuan Wang & Zhenlong Fang

  3. Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, IL, 61801, USA

    Deng Li

Authors
  1. Deng Li
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  2. Yong Kang
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  3. Xiaolong Ding
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  4. Xiaochuan Wang
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  5. Zhenlong Fang
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Corresponding author

Correspondence to Yong Kang.

Additional information

Supported by National Key Basic Research Program of China(973 Program, Grant No. 2014CB239203), National Natural Science Foundation of China(Grant No. 51474158), and China Scholarship Council(Grant No. 201406270047)

LI Deng, born in 1987, is currently a PhD candidate at School of Power and Mechanical Engineering, Wuhan University, China. He is now studying as a joint-PhD candidate at Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, USA. He received his bachelor degree from Wuhan University, China, in 2012. His research interests include self-excited oscillation pulsed waterjet and cavitating waterjet.

KANG Yong, born in 1978, is currently a professor at School of Power and Mechanical Engineering, Wuhan University, China. He received his bachelor and PhD degrees from Chongqing University, China, in 2001 and 2006. His research interests include waterjet theory and new waterjet technology.

DING Xiaolong, born in 1990, is currently a PhD candidate at School of Power and Mechanical Engineering, Wuhan University, China. His research interests include high speed waterjet peening and new waterjet technology.

WANG Xiaochuan, born in 1983, is currently an associate professor at School of Power and Mechanical Engineering, Wuhan University, China. His research interest is waterjet technology and its applications in mining engineering.

FANG Zhenlong, born in 1989, is currently a PhD candidate at School of Power and Mechanical Engineering, Wuhan University, China. His research interest is high speed self-excited oscillation waterjet.

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Li, D., Kang, Y., Ding, X. et al. Effects of area discontinuity at nozzle inlet on the characteristics of self-resonating cavitating waterjet. Chin. J. Mech. Eng. 29, 813–824 (2016). https://doi.org/10.3901/CJME.2016.0426.060

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