Experimental study on flow separation control by flexible serrated trailing edge based on multi-scale coherent structure analysis

GONG Xu’an; ZHANG Xin; MA Xingyu; FAN Ziye; TANG Zhanqi; JIANG Nan

doi:10.11729/syltlx20210041

Volume 36 Issue 6

Dec. 2022

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Journal of Experiments in Fluid Mechanics > 2022 > 36(6): 19-27. > DOI: 10.11729/syltlx20210041

GONG X A，ZHANG X，MA X Y，et al. Experimental study on flow separation control by flexible serrated trailing edge based on multi-scale coherent structure analysis[J]. Journal of Experiments in Fluid Mechanics，2022，36（6）：19-27.. DOI: 10.11729/syltlx20210041

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Experimental study on flow separation control by flexible serrated trailing edge based on multi-scale coherent structure analysis

GONG Xu’an^{1, 3,},
ZHANG Xin³,
MA Xingyu^{1, 2, ,},
FAN Ziye¹,
TANG Zhanqi^{1, 2},
JIANG Nan^{1, 2}

1.
Department of Mechanics, School of Mechanical Engineering, Tianjin University, Tianjin　300354, China
2.
Tianjin Key Laboratory of Modern Engineering Mechanics, Tianjin　300354, China
3.
State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang　621000, China

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Received Date: May 09, 2021
Revised Date: June 12, 2021
Accepted Date: June 27, 2021
Available Online: January 09, 2022

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Abstract

Abstract

This article reports our recent experimental study of airfoil flow separation control by flexible serrated trailing edge. The experiments were conducted in a straight-type wind tunnel and a hot-wire anemometer was used to measure the velocity profile downstream of the two-dimensional airfoil. Multi-scale coherent structures within the separated shear layers are analyzed both in the time and frequency domains. The results show that the separation bubble thickness decreases by almost 5% of the chord length, the flexible serrated trailing edge vibrates and deforms adaptively and absorbs nearly 20% of the trailing edge shear layer’s energy, perturbation transmits to the leading edge shear layer, and thus the power spectral density decreases significantly in the lower and larger bandwidth to reduce the noise. The coherent structures’ frequency and amplitude also decrease notably, breaking and inhibiting the large vortex package’s transmission obviously in the separation bubble.
- flow separation,
- flexible material,
- bionics design,
- wavelet analysis,
- multi-scale coherent structure

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References

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Experimental study on flow separation control by flexible serrated trailing edge based on multi-scale coherent structure analysis

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