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Structure of Turbulent Separating Flow in Two-Dimensional Diffusor

  • S. Masuda
  • H. Ooizumi
  • K. Yoshizumi
Conference paper
Part of the International Union of Theoretical and Applied Mechanics book series (IUTAM)

Summary

The structure of the turbulent wall layer developing into separation was studied. The experiments were performed in a two-dimensional asymmetric diffuser which was attached to a downstream end of a long straight channel to provide a fully developed turbulent inlet condition. The flow visualization revealed that the streaky structure in the wall layer of the approaching flow develops in its length scale under the action of the adverse pressure gradient and reaches to the local and instantaneous backflow, called incipient detachment. Further downstream, another lump of fluid comes running upstream with different spanwise scale and large transverse velocity, which characterizes the flow near the transitory detachment point.

Keywords

Wall Layer Adverse Pressure Gradient Streaky Structure Detachment Point Wall Slit 
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References

  1. 1.
    Simpson,R.L.; Some features of two-dimensional turbulent separated flows. A1AA Paper 85-0178(1085).Google Scholar
  2. 2.
    Vvei,Q.-D. and Sato H.; An experimental study of the mechanism of intermittent, separation of a turbulent boundary layer. Journal of fluid Mechanics 143 (1984) 153–172.ADSCrossRefGoogle Scholar
  3. 3.
    Kline,S.J.; Observed Structure Features in Turbulent and Transitional Boundary Layer, in Fluid Mechanics of Internal Flow, Ud.G.Sovran Elsevier(1967) 27–79.Google Scholar

Copyright information

© Springer-Verlag, Berlin Heidelberg 1991

Authors and Affiliations

  • S. Masuda
    • 1
  • H. Ooizumi
    • 1
  • K. Yoshizumi
    • 2
  1. 1.Faculty of Science and TechnologyKeio UniversityYokohamaJapan
  2. 2.Nomura Research InstituteYokohamaJapan

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