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Volume 24 Issue 2
Feb.  1998
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Journal of Beijing University of Aeronautics and Astronautics  > 1998  >  24(2): 178-180.
Wang Jinjun, Lan Shilong. Turbulent Intensities Distributions over a Riblets Surface[J]. Journal of Beijing University of Aeronautics and Astronautics, 1998, 24(2): 178-180. (in Chinese)
Citation: Wang Jinjun, Lan Shilong. Turbulent Intensities Distributions over a Riblets Surface[J]. Journal of Beijing University of Aeronautics and Astronautics, 1998, 24(2): 178-180. (in Chinese)
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Turbulent Intensities Distributions over a Riblets Surface

  • Beijing University of Aeronautics and Astronautics,Dept. of Flight Vehicle Design Applied Mechanics

  • Received Date: 18 Sep 1996
  • Publish Date: 28 Feb 1998
    Abstract
  • The LDV technique has been used to measure the turbulent intensity distribution of turbulent boundary layer flow over a riblets surface.The experimental results indicate that,in comparision with the smooth surface results,the maximum value of turbulent intensity is smaller,but its occurrence position is farther.Moreover,in the region very near the riblets surface,i.e. y++<4,there exists greater value of turbulent intensities,which means that where the riblets surface enhances the flow turbulence.For y/δ≥0.06,the distribution of turbulent intensity can be described as u′/u=2.3exp(-0.9y/δ),otherwise,u′/u=36.4y/δ.

     

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  • 1.Bacher E V,Smith C R.A　combined visualizationanemometry study of the turbulent drag reducing mechanisms of triangular microgroove surface modifications.AIAA-85-0548,1985 2. Gallagher J A,Thomas A S W.Turbulent boundary layer characteristics over streamwise grooves.AIAA-84-2185,1984 3. Pulles C J A,Prasad K K,Nieuwstadt F T M.Turbulence measurements over longitudinal microgrooved surfaces.Applied Scientific Research,1989,46:197~208 4. Choi K S.Near wall structure of a turbulent boundary layer with riblets.Journal of Fluid Mechanics,1989,208:417~458 5. Tang Y P,Clark D G.On nearwall turbulencegenerating events in a turbulent boundary layer on a riblet surface.Applied Scientific Research,1993,50:215~232 6. Nezu I,Rodi W.Openchannel flow measurements with a Laser Doppler Anemometer.Journal of Hydraulic Engineering,1986,112.335~355
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