Structural and mixing characteristics influenced by streamwise vortices in supersonic flow

By utilizing nanoparticle-based planar laser scattering method, the flow structures and mixing characteristics with the existence of large-scale streamwise vortices generated by a lobed mixer are investigated experimentally. The emergence and evolution of streamwise and spanwise vortices and the int...

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Bibliographic Details
Published inApplied physics letters Vol. 110; no. 12
Main Authors Zhang, Dongdong, Tan, Jianguo, Hou, Juwei
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 20.03.2017
Subjects
Air flow
Applied physics
Boundary layer
Emergence
Entrainment
Fluid dynamics
Fluid flow
Fractal analysis
Nanoparticles
Supersonic flow
T shape
Vortices
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Summary:By utilizing nanoparticle-based planar laser scattering method, the flow structures and mixing characteristics with the existence of large-scale streamwise vortices generated by a lobed mixer are investigated experimentally. The emergence and evolution of streamwise and spanwise vortices and the interaction between these two kinds of vortical structures are clearly exhibited. Fractal analysis reveals that streamwise vortices are strongly convoluted and possess complicated three-dimensional characteristics, which can favor molecular mixing. The turbulent/non-turbulent interface is obviously present, in which drastic turbulent entrainment occurs. Moreover, the emergence of typical T-shaped vortex suggests that this kind of vortex is a usual topological structure in turbulent transition region.
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ISSN:0003-6951
1077-3118
DOI:10.1063/1.4979054