Advanced Optical Diagnostics in Hypersonic Flows
[Technical Report, Memorandum Report]
NAVAL RESEARCH LAB WASHINGTON DC
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This work aims to investigate and establish optical diagnostics techniques for the U.S. Naval Research Laboratorys NRL Variable-Speed Hypersonic Wind Tunnel HSWT during the two year Karles Fellowship. Stereoscopic planar laser Rayleigh scattering of CO2 particles, typically several nanometers to tens of nanometers in size, were used in this study allowing cross-sectional visualization of the supersonic flow and turbulent boundary layers throughout the test section of the U.S. Naval Academy Supersonic Wind Tunnel. The optical diagnostic measurements show asymmetric boundary layer growth between the top and bottom walls of the test section as well as a disturbed bottom boundary layer due to the induced pressure and velocity gradient.
- Fluid Mechanics