Abstract
Radiation emanating from the free stream and shock layer flow over a 15.24 cm diameter bluntbody test article was measured in the NASA Ames 20 MW Aerodynamic Heating Facility (AHF) Arc-jet. The emission spectra were taken simultaneously over a 2000-9500 A wavelength range using a CCD camera (1024 x 256 array) attached to a spectrograph. Measurements were carried out along the radial direction covering the entire free stream and shock layer flow. The optical system was calibrated using tungsten and deuterium radiation sources and the calibrated emission spectra from the free stream and shock layer were Abel inverted. Nitric oxide spectra from the free stream were analyzed to determine rotational temperature and uniformity of the NO distribution in the flow. Using previously developed analytical tools, spectra from the shock layer were analyzed to determine the local thermodynamic properties from the calibrated spectra: rotational, vibrational, and electronic temperatures.
Published Version
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