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Title:Experimental Measurements of Pressure, Temperature, and Density Using High-Resolution N(2) Coherent Anti-Stokes Raman Scattering
Author(s):Woodmansee, Mark Allen
Doctoral Committee Chair(s):Dutton, J. Craig; Lucht, Robert P.
Department / Program:Mechanical Engineering
Discipline:Mechanical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Engineering, Aerospace
Abstract:In the underexpanded jet flowfield, the experimental P/T/p measurements are compared to similar quantities extracted from a RANS CFD simulation. The agreement between the mean CARS measurements and CFD predictions along the jet centerline and radial traverses is generally excellent. This CARS technique is able to capture the low-pressure and low-temperature conditions of the M = 3.4 flow entering the Mach disk, as well as the conditions immediately downstream of this normal shock. Further downstream, both the CARS and CFD temperature distributions corroborate the existence of concentric inner and outer shear layers. The former evolves from a slip line that separates the subsonic inner jet fluid from the surrounding annulus of supersonic fluid. Similarly, the existence of counter-rotating streamwise-oriented vortices may explain the slight deviations of the CARS pressure measurements from the CFD pressure distribution in the outer compressible shear layer.
Issue Date:1999
Description:225 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1999.
Other Identifier(s):(MiAaPQ)AAI9953178
Date Available in IDEALS:2015-09-25
Date Deposited:1999

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