EXPERIMENTAL METHOD FOR DRAG REDUCTION BY COMPLIANT COATING

سال انتشار: 1384
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 2,715

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شناسه ملی سند علمی:

NSMI07_073

تاریخ نمایه سازی: 19 بهمن 1384

چکیده مقاله:

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) binding of velvet fabric to the metal disc with velour face outward, (2) casting a premixed silicone compositions over the velvet fabric, (3) covering the silicone layer with a this, stiff polymer film. As a result of the rests in certain cases drag coefficient was reduced by 20% of 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 the coating . the change of drag coefficient of discs to be strongly influenced by the dynamic mechanical properties of the silicone elastomer network.

نویسندگان

Ahmad Fakhar

ph.D Candidate, Tehran Azad University, S. and R. Unit , Iran

M.Rad

professor, Sharif University of Tech., Tehran , Iran

SH.Afkhami

ph.D Candidate , University of Technology Tehran, Iran

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  • Fakhar, Ahmad. Rad, M. *Darg Reduction of Ships by Microbubbles ...
  • Fakhar, Ahmad. Rad, M. *Application of Silicone Matter for Drag ...
  • Fakhar, Ahmad. Rad, M. *Application Composite Coating for Hydrodynami c ...
  • Fakhar, Ahmad. Rad, M. *Drag Reduction of Ships and Submarines ...
  • Kramer. M .O. , ; 4Boundary -layer stabilization by damping ...
  • Ffowcs Williams, J. E., Bolt-Beranek and Newman Inc., Report No. ...
  • Ash, R., ،4th Biennial Symposium on Turbulence «, Univ. Missouri, ...
  • Kramer, M.O., Naval Engineers J., 74, 341, 1962. ...
  • Kramer, M.O., Memorandum RM -3018, RAND Corp.Santa Monica, CA., 1962. ...
  • Klinzing, G.E., and J.F. Mario, IEC Proc. Dept., 8, (1), ...
  • Garrad AD., The hydrodynamic stability of flow over kramer -type ...
  • Willis GFK., Hydro dynamic stability of flows over compliant walls. ...
  • Daniel AP, Boundary layer stablity on comliant surface on compliant ...
  • Gaster M. Is the dolphin red herring? In: Liepmann HW, ...
  • Davies C., Carpenter PW., Numerical simulation evolution of Tollmien -Schlichting ...
  • Carpenter PW. Optimizaton of Multiple -Panel Compliant Walls for Delay ...
  • Lee T. , Investigation of the stable interaction of a ...
  • Choi K-S, Yang X, Clayton BR, Glover EJ, Atlar M, ...
  • Bushnell DM., Hefner JN, Ash R L. Effect of compliant ...
  • Gad-el-Hak M. Boundary layer interactions with compliant coatings: an overview. ...
  • Smith RL., Skin friction of compliant surfaces with foamed material ...
  • Metcalfe RW. Boundary layer control: a brief review. In:Periax J, ...
  • Gad-el-Hak M. Flow cntrol: passive, active, and reactive flow management. ...
  • Carpenter PW, Lucey AD, Davies C. Progress on the use ...
  • ed. Mcgraw-Hill Inc. New York, 1979. ا 7 Schlichting, Boundary ...
  • Orszag, S. A., NASA Report, NASA -CR-291 1, 1979. Grosskreutz, ...
  • نمایش کامل مراجع