Density measurements in an expanding flow using holographic interferometryA nonequilibrium expansion of nitrogen through a 2-dimensional nozzle of a reflected shock tunnel is investigated with laser holography, time resolved pressure measurements and emission spectroscopy to characterize the flow field for vibrational relaxation measurements. A 2D computation is used to simulate the nozzle flow field. Synthetic holograms are generated using the computed density profiles and are compared with the experimental holograms. Also, using a quasi 1-D approximation, populations for each vibrational level are computed by (1) solving the master equations and (2) using the Landau-Teller formulation. Computational accuracy of both models is assessed against the experimental data.
Document ID
19920046960
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Sharma, Surendra P. (NASA Ames Research Center Moffett Field, CA, United States)
Ruffin, Stephen M. (NASA Ames Research Center Moffett Field, CA, United States)
Meyer, Scott A. (NASA Ames Research Center Moffett Field, CA, United States)
Gillespie, Walter D. (Stanford University CA, United States)
Yates, Leslie A. (Eloret Institute Palo Alto, CA, United States)