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Measured and calculated spectral radiation from a blunt body shock layer in an arc-jet wind tunnelSpectra of the shock layer radiation incident on the stagnation point of a blunt body placed in an arc-jet wind tunnel were measured over the wavelength range from 600 nm to 880 nm. The test gas was a mixture of 80 percent air and 20 percent argon by mass, and the run was made in a highly nonequilibrium environment. The observed spectra contained contributions from atomic lines of nitrogen, oxygen, and argon, of bound-free and free-free continua, and band systems of N2 and N2(+). The measured spectra were compared with the synthetic spectra, which were obtained through four steps: the calculation of the arc-heater characteristics, of the nozzle flow, of the blunt-body flow, and the nonequilibrium radiation processes. The results show that the atomic lines are predicted approximately correctly, but all other sources are underpredicted by orders of magnitude. A possible explanation for the discrepancy is presented.
Document ID
Document Type
Conference Paper
Babikian, Dikran S.
(Eloret Corp. Palo Alto, CA., United States)
Palumbo, Giuseppe
(Eloret Corp. Palo Alto, CA., United States)
Craig, Roger A.
(MCAT Inst. Moffett Field, CA., United States)
Park, Chul
(NASA Ames Research Center Moffett Field, CA, United States)
Palmer, Grant
(NASA Ames Research Center Moffett Field, CA, United States)
Sharma, Surendra P.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 6, 2013
Publication Date
July 1, 1994
Publication Information
Publication: MCAT Inst., Planetary Entry Experiments
Subject Category
Report/Patent Number
AIAA PAPER 94-0086
Meeting Information
Aerospace Sciences Meeting(Reno, NV)
Accession Number
Funding Number(s)
Distribution Limits
Work of the US Gov. Public Use Permitted.
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