Investigation the Effects of Compliant Coating on Drag Reduction and Prevent Cavitation Damage by Experimental method
Publish place: 8th National Symposium of Marine Industries
Publish Year: 1385
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
NSMI08_070
تاریخ نمایه سازی: 20 اسفند 1384
Abstract:
The drag coefficients on discs rotating in a cylindrical tank has studied in relation to the nature of a composite coating attached to the underside of the disc, and direct comparisons were made with refrence discs of identical geometry which were completely rigid. The composite coating was formed by: (1) bondig of velvet fabric to the metal disc with velour face outward, (2) casting a premixed silicone composition over the velvet
fabric, (3) covering the silicone layer with a thin, stiff polymer film.As a result of the tests in certain cases drag coefficient was reduced by 20% or more as compared to refrence rigid discs. Two conclusions are possible: (1)True reduction of energy exchange in the turbulent boundary layer was achived, perhaps by damping of the turbulent bursting process ; (2) A significant increase in the laminar region at the center of disc was obtainded (transition of laminar to turbulent delayed). The stiffness of the top film influenced the performance of the coating. The change of drag
coefficient of discs to be strongly influenced by the dynamic mechanical properties of the silicone elastomer network. In the next experiments, was observed that cavitation at rotatinge disc in the cylinder tank and also hydrofoil in water tunnel, both with compliant coating, was incepted
later as compared with identical reference solid that.
Keywords:
Compliant Coating- Drag Reduction- Transition Delay-Cavitation
Authors
Ahmad Fakhar
Ph.D. Candidate and member of the Sci. Board
M.Rad
Professor & Associate Profrssor
M. Taeibi-Rahni
Professor & Associate Profrssor
SH. Afkhami
Ph.D. Candidate
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