Ionizing nitrogen and air flows in a superorbital expansion tube

McIntyre, TJ, Bishop, AI, Thomas, AM, Sasoh, A and Rubinsztein-Dunlop, H (2000) Ionizing nitrogen and air flows in a superorbital expansion tube. AIAA Journal, 38 9: 1685-1691. doi:10.2514/2.1154


Author McIntyre, TJ
Bishop, AI
Thomas, AM
Sasoh, A
Rubinsztein-Dunlop, H
Title Ionizing nitrogen and air flows in a superorbital expansion tube
Journal name AIAA Journal   Check publisher's open access policy
ISSN 0001-1452
Publication date 2000-01-01
Sub-type Article (original research)
DOI 10.2514/2.1154
Volume 38
Issue 9
Start page 1685
End page 1691
Total pages 7
Place of publication VA, USA
Publisher American Institute of Aeronautics & Asronautics (AIAA)
Language eng
Subject C1
240502 Fluid Physics
780102 Physical sciences
Abstract Vehicles on interplanetary missions enter atmospheres at very high (superorbital) velocities. The kinetic energy of the craft causes dissociation of molecules and ionization of all of the species present in the gas. Ground-based testing of such conditions in nitrogen has been performed in a new superorbital expansion tube, X2, using two optical techniques. Emission measurements identified sources of visible radiation that may influence optical measurements and can also contribute to radiative heat transfer. As well, the emission spectra from Stark-broadened hydrogen lines were used to measure electron concentrations between the bow shock and the body. Two-wavelength holographic interferometry was used to provide two-dimensional density and electron concentration profiles of the flow. Peak electron levels of around (4.0 +/- 0.6) x 10(16) cm(-3) were observed that agreed well with equilibrium estimates, A gradual increase in electron population after the shock was observed, reaching a maximum of about one-quarter of the distance from the body to the shock along the stagnation streamline. Thereafter the concentration decreased because of the influence of the body. Comparisons were also made between Rows over different sized cylinders and between air and nitrogen Rows.
Keyword Engineering, Aerospace
Holographic-interferometry
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Physical Sciences Publications
 
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Created: Tue, 10 Jun 2008, 21:38:11 EST