Experimental study of a supersonic turbulent boundary layer using PIV

  • Lin He
  • ShiHe Yi
  • YuXin Zhao
  • LiFeng Tian
  • Zhi Chen
Research Paper

Abstract

Particle image velocimetry was applied to the study of the statistical properties and the coherent structures of a flat plate turbulent boundary layer at Mach 3. The nanoparticles with a good flow-following capability in supersonic flows were adopted as the tracer particles in the present experiments. The results show that the Van Driest transformed mean velocity profile satisfies the incompressible scalings and reveals a log-law region that extends to y/δ=0.4, which is further away from the wall than that in incompressible boundary layers. The Reynolds stress profiles exhibit a plateau-like region in the log-law region. The hairpin vortices in the streamwise-wall-normal plane are identified using different velocity decompositions, which are similar to the results of the flow visualization via NPLS technique. And multiple hairpin vortices are found moving at nearly the same velocity in different regions of the boundary layer. In the streamwise-spanwise plane, elongated streaky structures are observed in the log-law region, and disappear in the outer region of the boundary layer, which is contrary to the flow visualization results.

Keywords

PIV turbulence supersonic boundary layer hairpin vortices statistical property coherent structures 

Copyright information

© Science China Press and Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Lin He
    • 1
  • ShiHe Yi
    • 1
  • YuXin Zhao
    • 1
  • LiFeng Tian
    • 1
  • Zhi Chen
    • 1
  1. 1.College of Aerospace and Material EngineeringNational University of Defense TechnologyChangshaChina

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