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An experimental study of ultraviolet radiation behind incident normal shock waves in CO2 at Venusian entry speedsRadiation intensity profiles behind incident normal shock waves in pure CO2 have been measured spectroscopically in the Langley Arc-Driven Shock Tube. These profiles, which were obtained for shock velocities between 9 and 13 km/sec and ambient densities corresponding to Venus altitudes between 100 and 80 km, were measured in the vacuum ultraviolet regime. Wavelengths of 127.7, 158.0, 177.5, and 195.0 nm were monitored simultaneously using a four-channel vacuum spectrograph equipped with sodium-salicylate-coated photomultipliers, thereby including the CO(4+) band system which is the most prominent radiator. Measured nonequilibrium overshoots are modeled to provide a means of estimating the effect of nonequilibrium radiation heating to the stagnation region of proposed aero-shells for Venusian entry. These results indicate a significant increase in radiative heating due to nonequilibrium effects. The measurements are believed to represent the most accurate data available on the effect of nonequilibrium radiative heat transfer for Venus entry. This accuracy is primarily due to improved spectrographic instrumentation, which is discussed in some detail regarding its application in related studies.
Document ID
19750060191
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Nealy, J. E.
(NASA Langley Research Center Space Systems Div., Hampton, Va., United States)
Date Acquired
August 8, 2013
Publication Date
September 1, 1975
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
AIAA PAPER 75-1150
Accession Number
75A44263
Distribution Limits
Public
Copyright
Other

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