Visualizing supersonic inlet duct unstart using planar laser Rayleigh scattering

Planar laser Rayleigh scattering (PLRS) from condensed CO 2 particles is used to visualize flow structure in a Mach 5 wind tunnel undergoing unstart. Detailed flow features such as laminar/turbulent boundary layers and shockwaves are readily illustrated by the technique. A downstream transverse air...

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Bibliographic Details
Published in:Experiments in fluids 2011-06, Vol.50 (6), p.1651-1657
Main Authors: Do, Hyungrok, Im, Seong-kyun, Mungal, M. Godfrey, Cappelli, Mark A.
Format: Article
Language:English
Subjects:
Boundary layer
Compressible flows
shock and detonation phenomena
Downstream effects
Engineering
Engineering Fluid Dynamics
Engineering Thermodynamics
Exact sciences and technology
Fluid dynamics
Fluid- and Aerodynamics
Fundamental areas of phenomenology (including applications)
Heat and Mass Transfer
Instrumentation for fluid dynamics
Lasers
Physics
Rayleigh scattering
Research Article
Separation
Shock-wave interactions and shock effects
Turbulent boundary layer
Upstream
Wind tunnels
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Summary:Planar laser Rayleigh scattering (PLRS) from condensed CO 2 particles is used to visualize flow structure in a Mach 5 wind tunnel undergoing unstart. Detailed flow features such as laminar/turbulent boundary layers and shockwaves are readily illustrated by the technique. A downstream transverse air jet, inducing flow unchoking downstream of the jet, is injected into the free stream flow of the tunnel, resulting in tunnel unstart. Time sequential PLRS images reveal that the boundary layer growth/separation on a surface with a thick turbulent boundary layer, initiated by the jet injection, propagates upstream and produces an oblique unstart shock. The tunnel unstarts upon the arrival of the shock at the inlet. In contrast, earlier flow separation on the opposite surface, initially supporting a thin laminar boundary layer, is observed when a jet induced bow shock strikes that surface. The resulting disturbance to this boundary layer also propagates upstream and precedes the formation of an unstart shock.
ISSN:0723-4864
1432-1114
DOI:10.1007/s00348-010-1028-4