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A new type of cavitation damage triggered by boundary-layer turbulent production
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Li, S. C., Liu, S. H. and Wu, Y. L. (2007) A new type of cavitation damage triggered by boundary-layer turbulent production. Modern Physics Letters B, Vol.21 (No.20). pp. 1285-1296. doi:10.1142/S0217984907013456 ISSN 0217-9849.
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Official URL: http://dx.doi.org/10.1142/S0217984907013456
Abstract
A new type of cavitation damage has been observed on the turbines installed at the Three Gorges Power Station despite no cavitation detected during model tests. Metallurgical and fluid dynamic analysis suggests that this cavitation is triggered by boundary-layer turbulent production; the damaged (roughened) spot in turn triggers subsequent cavitation (damage) immediately down stream. This forms a sustainable dynamic process, resulting in long and equal-width streamwise damage-strips with spanwise regularity reflecting the spanwise stochastic characteristics of turbulent production. Owing to the heat effect of cavitation, intergranular corrosion takes place through sensitization process, leaving the damaged surface with a corrosion appearance. Also, bluing presents at the damaged tails, owing to the nature of low-intensity damage. Extremely large turbines are much more susceptible to this type of cavitation (damage) owing to the similarity laws currently employed for turbine development not concerning the freestream turbulence and the boundary-layer dynamics.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||
Journal or Publication Title: | Modern Physics Letters B | ||||
Publisher: | World Scientific Publishing Co. Pte. Ltd. | ||||
ISSN: | 0217-9849 | ||||
Official Date: | 30 August 2007 | ||||
Dates: |
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Volume: | Vol.21 | ||||
Number: | No.20 | ||||
Number of Pages: | 12 | ||||
Page Range: | pp. 1285-1296 | ||||
DOI: | 10.1142/S0217984907013456 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
Data sourced from Thomson Reuters' Web of Knowledge
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