Scaling Effects on Cavitation Erosion Pits

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In order to clarify the scaling effects on cavitation erosion, erosion pits are carefully measured using a digital image processing technique for four similar flat-hydrofoils with chord length C from 53 mm to 160 mm, corresponding to the cavitation aspects, under similar conditions of cavitation-nuclei size-distribution in the test water, flow velocity, angle of attack and cavitation number. Because the cavitation intensity is correspond to types of cavitation and it is also associated with cavitation-nuclei size-distribution and flow velocity. The erosion intensity Ier, that is defined by the diameter of erosion pits and the pitting rate, is determined to be a power law: IEr ∝ C. In the average erosion intensity over the hydrofoils, the exponent n is 2, while at the maximum local erosion intensity, the exponent n is 4.5. The erosion pits predominantly result from the vortex cavitation.

Original languageEnglish
Pages (from-to)3366-3372
Number of pages7
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Issue number555
Publication statusPublished - 1992


  • Cavitation
  • Digital Image Processing
  • Erosion
  • Hydrofoil
  • Scaling Effects
  • Vortex


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