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In a low-noise supersonic wind tunnel at a Mach number 3.4, visualization of flow structure around backward facing step (BFS) with a 3 mm high step is carried out via schlieren and nano-tracer-based planar laser scattering (NPLS) respectively. The time-averaged flow characteristic of the reattachment region and the rich instantaneous structures of the redeveloping boundary layer are both revealed. By contrasting the NPLS images at different times, the unsteady evolvement characteristic of the coherent vortices in the redeveloping boundary layer is discussed. And the results are compared with the schlieren of Mach 4.2 and the prior data published. Results indicate that with either of the two flow visualization ways, the shock waves and the expansion waves can be captured; however, the NPLS technique has the obvious advantages to reveal the instantaneous structures on a small scale in a certain section plane with a time resolution of 6 ns and spatial resolution about micron magnitude; under the flow condition in this contribution, the growth rate of redeveloping boundary layer is 0.07519; the characteristic time is around 10 μs of the hairpin vortex shedding. At the same expansion rate, the reattachment occurs later with increasing Mach numbers, while if the expansion rate increases, the reattachment occurs earlier, and the flow turn angle is larger.
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Keywords:
- supersonic /
- backward facing step /
- reattachment /
- redeveloping boundary layer
[1] Troutt T R, Scheelke B, Morman T R 1984 J. Fluid Mech. 143 413
[2] Jagannath R 2011 Ph. D. Dissertation (Toronto: University of Toronto)
[3] Abdallah S 1966 AD Report 647 958
[4] Eaton J K, Johnston J P 1980 AIAA Paper, 80-1438
[5] Nicole R M, Rodney D W B 2012 AIAA Paper 2012-2709
[6] Biswas G, Breuer M, Durst F 2004 Transactions of ASME 126 362
[7] Chen Z, Yi S H, Tian L F, He L, Zhu Y Z 2013 Shock Waves 23 299
[8] Zhao Y X, Yi S H, Tian L F, Cheng Z Y 2009 Sci. Chin. Ser. E 52 3640
[9] Zhao Y X, Yi S H, He L, Tian L F, Cheng Z Y 2007 Chin. Sci. Bull. 52 1297
[10] Zhao Y X, Yi S H, Tian L F, He L, Cheng Z Y 2008 Sci. Chin. Ser. G 51 1134
[11] Zhu Yang-Zhu, Yi Shi-He, He Lin, Tian Li-Feng, Zhou Yong-Wei 2013 Chin. Phys. B 22 014702
[12] Zhang Qing-Hu, Yi Shi-He, Zhu Yang-Zhu, Chen Zhi, Wu Yu 2013 Chin. Phys. Lett. 30 044701
[13] He Lin, Yi Shi-he, Tian Li-Feng, Chen Zhi, Zhu Yang-Zhu 2013 Chin. Phys. B 22 024704
[14] Yi S H, He L, Zhao Y X, Tian L F, Cheng Z Y 2009 Sci. Chin. Ser. G 52 2001
[15] Tian L F, Yi S H, Zhao Y X, He L, Cheng Z Y 2009 Sci. Chin. Ser. G 52 1357
[16] Eaton J K, Johnston J P 1982 Turbulent Shear Flows 3 162
[17] Nedjib D 1987 Ph. D Dissertation (Vancouver, University of British Columbia)
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[1] Troutt T R, Scheelke B, Morman T R 1984 J. Fluid Mech. 143 413
[2] Jagannath R 2011 Ph. D. Dissertation (Toronto: University of Toronto)
[3] Abdallah S 1966 AD Report 647 958
[4] Eaton J K, Johnston J P 1980 AIAA Paper, 80-1438
[5] Nicole R M, Rodney D W B 2012 AIAA Paper 2012-2709
[6] Biswas G, Breuer M, Durst F 2004 Transactions of ASME 126 362
[7] Chen Z, Yi S H, Tian L F, He L, Zhu Y Z 2013 Shock Waves 23 299
[8] Zhao Y X, Yi S H, Tian L F, Cheng Z Y 2009 Sci. Chin. Ser. E 52 3640
[9] Zhao Y X, Yi S H, He L, Tian L F, Cheng Z Y 2007 Chin. Sci. Bull. 52 1297
[10] Zhao Y X, Yi S H, Tian L F, He L, Cheng Z Y 2008 Sci. Chin. Ser. G 51 1134
[11] Zhu Yang-Zhu, Yi Shi-He, He Lin, Tian Li-Feng, Zhou Yong-Wei 2013 Chin. Phys. B 22 014702
[12] Zhang Qing-Hu, Yi Shi-He, Zhu Yang-Zhu, Chen Zhi, Wu Yu 2013 Chin. Phys. Lett. 30 044701
[13] He Lin, Yi Shi-he, Tian Li-Feng, Chen Zhi, Zhu Yang-Zhu 2013 Chin. Phys. B 22 024704
[14] Yi S H, He L, Zhao Y X, Tian L F, Cheng Z Y 2009 Sci. Chin. Ser. G 52 2001
[15] Tian L F, Yi S H, Zhao Y X, He L, Cheng Z Y 2009 Sci. Chin. Ser. G 52 1357
[16] Eaton J K, Johnston J P 1982 Turbulent Shear Flows 3 162
[17] Nedjib D 1987 Ph. D Dissertation (Vancouver, University of British Columbia)
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