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  • Special Column on The National Symposium on Cavitation Flows 2021 (NSCF-2021) (Guest Editor Zheng Ma)
  • Published:

Risk assessment of erosive aggressiveness due to the condensation shock by numerical simulation

Abstract

Cavitation is, for the engineering areas such as fluid machinery and ship propulsion, a known source of erosion. The erosion damage due to cavitation bubble collapse can lead to extreme failure events, implying the replacement of a ship propeller or a turbine in a hydropower plant, all of which are very costly operations. The dynamics of cavitation hydraulic structure is of great importance for cavitation erosion. As a result, the blade surface endures some extremely high stresses, which lead to the cause of wear. Two major mechanisms, re-entrant jet as well as condensation shock, are known to such transient cavitating flow. In the present work we study the latter since less has been reported for the erosion caused by such an unsteady cavitating flow. We adopted an energy transportation equation based method, combined with a collapse event detection strategy, to carry out numerical erosion risk assessment for erosive aggressiveness due to the condensation shock. Comparing with the paint test, our result shows good agreement in the erosive pattern. We further discussed the hydrodynamics of the related flow structures.

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Acknowledgements

The authors would appreciate greatly the discussion with Dr. Soren Schenke from Delft University of technology, Dr. Andreas Peter from University of Duisburg-Essen.

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Correspondence to Wei Zhang.

Additional information

Project supported by the National Natural Science Foundation of China (Grant No. 91852106).

Biography: Wei Zhang (1981-), Male, Ph. D., Senior Engineer

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Zhang, W., Zhu, B. Risk assessment of erosive aggressiveness due to the condensation shock by numerical simulation. J Hydrodyn 34, 200–206 (2022). https://doi.org/10.1007/s42241-022-0018-3

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  • DOI: https://doi.org/10.1007/s42241-022-0018-3

Key words

  • Condensation shock
  • numerical simulation
  • cavitation erosion