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Rotational Relaxation Analysis of Nitrogen in Low-Density Freejet Expansions

Author
Gochberg, Lawrence A.
Published
[1994].
Physical Description
1 electronic document
Additional Creators
Haas, Brian L.
Online Version

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Summary
The phenomena of rotational relaxation of nitrogen has been examined by numerous investigators over many years. One of the experiments which has been performed examines nonequilibrium flow in low-density free jet expansions. Data have been taken in such flows using a variety of techniques, including time-of-flight methods and electron beam fluorescence spectroscopy. The direct flow properties measured in these different investigations, such as density and translational, rotational and vibrational temperatures generally show reasonable agreement. However, this kind of correlation from experiment to experiment tends to be lost when these data are analyzed to obtain rotational relaxation time or collision number. The goal of such data analyses is to generate a succinct model for rotational relaxation in nitrogen which is essential for the computation of nonequilibrium rarefied flows. The objective of the present work is to process a large body of experimental data in a consistent manner to yield relaxation model parameters of the greatest utility for flow computations.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 20010047670.
19th International Symposium on Purified Gas Dynamics; Oxford; United Kingdom.
18th Ground Test Conference: The Electron Beam Fluorescence Technique in Hypersonic Aerothermodynamics; 20-24 Jun. 1994; Colorado Springs, CO; United States.
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View MARC record | catkey: 15639621