Diagnostics of A Range of Highly Superorbital Carbon Dioxide Flows

Wegener, Margaret, Sutcliffe, Mark, Morgan, Richard, McIntyre, Tim and Rubinsztein-Dunlop, Halina (2001). Diagnostics of A Range of Highly Superorbital Carbon Dioxide Flows. In: 39th AIAA Aeropspace Sciences Meeting and Exhibit, Reno, USA, (). 8-11 January, 2001.

Author Wegener, Margaret
Sutcliffe, Mark
Morgan, Richard
McIntyre, Tim
Rubinsztein-Dunlop, Halina
Title of paper Diagnostics of A Range of Highly Superorbital Carbon Dioxide Flows
Conference name 39th AIAA Aeropspace Sciences Meeting and Exhibit
Conference location Reno, USA
Conference dates 8-11 January, 2001
Publication Year 2001
Sub-type Fully published paper
Abstract/Summary Expansion tubes are impulse facilities capable of generating highly energetic hyper-sonic flows. This work surveys a broad range of flow conditions produced in the facility X1 with carbon dioxide test gas, for simulation of spacecraft entry into the Martian atmosphere. Conditions with nominal flow speeds of 7, 9, 11 and 13 km/s were tested. The freestream conditions were calibrated using static/Pitot pressure measurements and advanced optical diagnostics. An extensive set of holographic interferometry experiments was performed on flows over wedges for quantitative study of freestream and post-shock densities, and post-shock ionisation. A one-dimensional code with frozen and equilibrium chemistry capabilities was used to estimate the freestream conditions. An equilibrium chemistry model produced a good match to measured freestream quantities at the high enthalpy conditions which are a major aim of this facility's operation. The freestream in the lower enthalpy conditions was found to be heavily influenced by chemical non-equilibrium. Non-equilibrium in the final unsteady expansion process of flow generation was accounted for by switching from equilibrium to frozen chemistry at a predetermined point. Comparison between the freestream density results of holographic interferometry, pressure measurements and computations shows good agreement.
Subjects 240402 Quantum Optics and Lasers
Keyword laser science
biophotonics
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Unknown
Additional Notes American Institute of Aeronautics and Astronautics Paper 2001 - 0304

Document type: Conference Paper
Collection: School of Physical Sciences Publications
 
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Created: Wed, 11 Apr 2007, 22:00:25 EST by Kaye Eldridge