Density measurements in an expanding flow using holographic interferometry

Conference · Wed Jan 01 04:00:00 EST 1992

OSTI ID:5223902

Sharma, S P; Ruffin, S M; Meyer, S A; Gillespie, W D; Yates, L A ^[1]

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1. NASA, Ames Research Center, Moffett Field, CA (United States) Stanford University, CA (United States) Eloret Institute, Palo Alto, CA (United States)

A 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. 17 refs.

• Research Organization: National Aeronautics and Space Administration, Moffett Field, CA (United States). Ames Research Center
• OSTI ID: 5223902
• Report Number(s): AIAA-Paper--92-0809; CONF-920157--
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
DENSITY
ELEMENTS
EMISSION SPECTROSCOPY
EVALUATION
EXPANSION
FLUID FLOW
GAS FLOW
MEASURING METHODS
NITROGEN
NONMETALS
NOZZLES
PHYSICAL PROPERTIES
PRESSURE MEASUREMENT
RELAXATION
SIMULATION
SPECTROSCOPY