Volume 27 Issue 5
May  2012
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JIANG Nan, YU Pei-ning, GUAN Xin-lei. Tomo-TRPIV measurement of coherent structure spatial topology in turbulent boundary layer[J]. Journal of Aerospace Power, 2012, 27(5): 1113-1121.
Citation: JIANG Nan, YU Pei-ning, GUAN Xin-lei. Tomo-TRPIV measurement of coherent structure spatial topology in turbulent boundary layer[J]. Journal of Aerospace Power, 2012, 27(5): 1113-1121.

Tomo-TRPIV measurement of coherent structure spatial topology in turbulent boundary layer

  • Received Date: 2011-08-16
  • Publish Date: 2012-05-28
  • The spatial-temporal sequence of 3D-3C(three-dimensional-three-component) simultaneous velocity field in a turbulent boundary layer was finely measured by tomographic TRPIV(time-resolved particle image velocimetry) in a water channel.A new concept of spatial local averaged velocity structure function was introduced to describe the dilation,compression and shear distortion and rotation of multi-scale eddy structures in turbulent flow.The three fluctuating velocity components of TBL (turbulent boundary layer) were decomposed into multi-scale components by spatial local averaged velocity structure function.A new turbulence coherent structure conditional sampling method was proposed based on the dilation and compression features of turbulent multi-scale eddy structures and the new concept of spatial local averaged velocity structure function.The eject and sweep process due to large-scale coherent structure burst was conditionally detected and the characteristic spatial topology modes of physical quantities,such as velocity and vorticity,during coherent structure bursts,were extracted from the tomo-PIV(particle image velocimetry) experimental dataset.A pair of counter-wise quasi-longitudinal horseshoe shaped vortex was discovered during coherent structure eject and sweep process.

     

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