Study of afterbody radiation during mars entry in an expansion tube

Gu, Sangdi, Morgan, Richard G. and McIntyre, Timothy J. (2017). Study of afterbody radiation during mars entry in an expansion tube. In: AIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting. 55th AIAA Aerospace Sciences Meeting, Grapevine, TX, United States, (). 9 - 13 January 2017. doi:10.2514/6.2017-0212


Author Gu, Sangdi
Morgan, Richard G.
McIntyre, Timothy J.
Title of paper Study of afterbody radiation during mars entry in an expansion tube
Conference name 55th AIAA Aerospace Sciences Meeting
Conference location Grapevine, TX, United States
Conference dates 9 - 13 January 2017
Convener American Institute of Aeronautics and Astronautics
Proceedings title AIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting
Place of Publication Reston, VA, United States
Publisher American Institute of Aeronautics and Astronautics
Publication Year 2017
Sub-type Fully published paper
DOI 10.2514/6.2017-0212
Open Access Status Not yet assessed
ISBN 9781624104473
Total pages 15
Language eng
Abstract/Summary Recent work has shown that a significant contributor to the afterbody aeroheating during Mars entry is radiation1-3. However, relevant ground test data is not available to help assess the uncertainty associated with prediction of the radiation when designing the thermal protection system for the aeroshell afterbody. The present work is aimed at studying the afterbody radiation experienced during Mars entry through experiments. The X2 expansion tube at the University of Queensland is used to generate the relevant experimental freestream flow conditions. Analysis is carried out to characterize the generated experimental freestream conditions. A two dimensional wedge model is used to produce the expanding flow which simulates aspects of the afterbody flow around Mars entry vehicles. This generated expanding flow has a test time of about 50-110 μs, thus, allowing flow measurements to be conducted. Horizontal emission spectroscopy measurements at 3.25 mm above the test model was taken for the carbon dioxide 4.3 μm band at freestream velocities of 2.8, 3.4, and 4.0 km/s. The measurements were compared to numerical calculations of the radiation emission generated from three-dimensional flowfield calculations. The comparison showed that the numerical result was significantly overpredicted for the 2.8 km/s condition and underpredicted for the 4.0 km/s condition.
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ

 
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