Measured and calculated spectral radiation from a blunt body shock layer in an arc-jet wind tunnel
- Author:
- Palmer, Grant
- Published:
- Jul 1, 1994.
- Physical Description:
- 1 electronic document
- Additional Creators:
- Craig, Roger A., Babikian, Dikran S., Sharma, Surendra P., Palumbo, Giuseppe, and Park, Chul
Online Version
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- Restrictions on Access:
- Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access - Summary:
- Spectra 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.
- Other Subject(s):
- Collection:
- NASA Technical Reports Server (NTRS) Collection.
- Note:
- Document ID: 19950007307.
Accession ID: 95N13720.
AIAA PAPER 94-0086.
MCAT Inst., Planetary Entry Experiments; 11 p.
Aerospace Sciences Meeting; 10-13 Jan. 1994; Reno, NV; United States. - Terms of Use and Reproduction:
- No Copyright.
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