Experimental Measurements of Pressure, Temperature, and Density Using High-Resolution N(2) Coherent Anti-Stokes Raman Scattering

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Mechanical Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Woodmansee, Mark Allen

Contributors dc:contributor

• Dutton, J. Craig
• Lucht, Robert P.

• Engineering, Aerospace

Language dc:language

eng

Identifier

(MiAaPQ)AAI9953178

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/83998