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Experimental evidence for non-linear growth in compressible mixing layer

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Abstract

An experimental study of compressible mixing layers (CMLs) was conducted using planar laser Mie scattering (PLMS) visualizations from condensed ethanol droplets in the flow. Large ensembles of digital images were collected for two flow conditions at convective Mach numbers M c = 0.11 and 0.47. The coherent vortices, braids and eruptions in the mixing zone were observed, interpreted as evidence of multi-scale, three-dimensional structures at a high Reynolds number. The mixing layers with a large visualized range present two stages along the streamwise direction, corresponding to the initial mixing and the well-developed stage. A new method, the gray level ensemble average method (GLEAM), by virtue of the similarity of the mixing layer, was applied to measure the growth rate of the CML thickness. New evidence for a nonlinear growth of CML is reported, providing an interpretation of previous observations of the scattering of the growth rate.

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Authors and Affiliations

  1. State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing, 100871, China

    TieJin Wang, Jun Chen, XiaoTian Shi, Ning Hu & ZhenSu She

  2. China Academy of Aerospace Aerodynamics, Beijing, 100074, China

    TieJin Wang, XiaoTian Shi & Ning Hu

Authors
  1. TieJin Wang
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  2. Jun Chen
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  3. XiaoTian Shi
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  4. Ning Hu
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  5. ZhenSu She
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Correspondence to Jun Chen.

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Wang, T., Chen, J., Shi, X. et al. Experimental evidence for non-linear growth in compressible mixing layer. Sci. China Phys. Mech. Astron. 57, 963–970 (2014). https://doi.org/10.1007/s11433-014-5432-2

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  • DOI: https://doi.org/10.1007/s11433-014-5432-2

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