Flowfield and friction characteristics downstream of mirco vortex generator in turbulent boundary layer

ZHANG Yi; PAN Chong; DOU Jianyu; ZHANG Miao

doi:10.11729/syltlx20230027

Volume 37 Issue 4

Aug. 2023

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Article Navigation > Journal of Experiments in Fluid Mechanics > 2023 > 37(4): 48-58

ZHANG Y, PAN C, DOU J Y, et al. Flowfield and friction characteristics downstream of mirco vortex generator in turbulent boundary layer[J]. Journal of Experiments in Fluid Mechanics, 2023, 37(4): 48-58 doi: 10.11729/syltlx20230027

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Flowfield and friction characteristics downstream of mirco vortex generator in turbulent boundary layer

doi: 10.11729/syltlx20230027

ZHANG Yi^1
,,
PAN Chong^{1, 2},
DOU Jianyu¹,
ZHANG Miao^{3
,
,}

1.
School of Aeronautic Science and Engineering, Beihang University, Beijing　100191, China
2.
Aircraft and Propulsion Laboratory, Ningbo Institute of Technology, Beihang University, Ningbo　315800, China
3.
Shanghai Aircraft Design & Research Institute, Commercial Aircraft Corporation of China Ltd., Shanghai　201210, China

Received Date: 2023-03-07
Accepted Date: 2023-05-10
Rev Recd Date: 2023-05-07
Publish Date: 2023-08-30

Abstract

Abstract

The present work uses the stereoscopic particle image velocimetry and calibration-free dual hot-film wall shear stress measurement sensor to measure the flowfield and friction at downstream of the one array of forwards wedge Micro Vortex Generator (MVG) in the turbulent boundary layer at moderate Reynolds number. The result of flowfield measurement shows that MVG produces the streamwise velocity defect regions and streamwise vortices pairs in downstream time-averaged flowfield, which causes the second outer-peak in the spanwise pre-multiplied energy spectra. The result of proper orthogonal decomposition shows that the contribution of energy of structures induced by MVG is equivalent to the that of large-scale structures and very large-scale structures in the smooth-wall turbulent boundary layer, which also significantly affects the spatial distribution of the near-wall structures. The friction measurement experiment shows that MVG array with higher height and closer spanwise arrangement has higher friction drag reduction. The drag reduction effect of MVG lasts downstream to 80 times of its own characteristic height.
- micro vortex generator,
- turbulent boundary layer,
- Reynolds stress,
- flow control,
- friction drag

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References

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