Volume 22 Issue 6
Jun.  2007
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TAIN Yan, JIANG Nan. Experimental investigation of effects of temperature boundary layer on multi-scale coherent structures in wall turbulence[J]. Journal of Aerospace Power, 2007, 22(6): 980-985.
Citation: TAIN Yan, JIANG Nan. Experimental investigation of effects of temperature boundary layer on multi-scale coherent structures in wall turbulence[J]. Journal of Aerospace Power, 2007, 22(6): 980-985.
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Experimental investigation of effects of temperature boundary layer on multi-scale coherent structures in wall turbulence

  • Department of Mechanics, Tianjin University, Tianjing 300072, China

  • Received Date: 2006-11-21
  • Rev Recd Date: 2007-04-25
  • Publish Date: 2007-06-28
    Abstract
  • The velocity time sequence at different vertical locations of turbulent boundary layer in wind tunnel was finely measured using a hot-wire anemometer,at a resolution higher than the corresponding minimum turbulence time scale.As compared with normal temperature,the heat convection could accelerate the exchanges of momentum,mass and energy in wall turbulence,and also facilitate the development process of turbulent boundary layer.Wavelet analysis method was employed to study the effects of temperature boundary layer on phase-averaged waveforms of multi-scale coherent structures during ejection and sweep process in wall turbulence.The research reveals that heat convection enhances dramatically the strength of coherent structures,contributing much to the exchange of momentum,mass and energy in wall turbulence.

     

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