Radiation measurements behind 8-12 km/sec shock waves in air and a CO2 + N2 mixture
Abstract
An electromagnetic shock tube provided with a diaphragm was used to obtain radiation measurements behind 8 to 12 km/sec shock waves in air and a mixture of CO2 + N2. Measurements of the continuum radiation intensity of air and the mixture were provided by the photoelectric method at a wavelength of 5300 A with a band interval of 10 A. To find the spectral radiation distribution of shock heated gases, spectral pictures were taken using a system of two fast shutters installed in front of the spectrometer. The photographic scheme used made it possible to cut out the radiation from the contact region and the driver gas. The experiment allowed calibration of the photographic film for an absolute sensitivity using a nine-step attenuator, with enhancement of the processing accuracy of the spectrum with heterochromatic photometry. Theoretical and experimental absorption coefficient spectral distribution for air and CO2 + N2 mixture at high temperatures and pressures are plotted and discussed. Disagreement of results wiht the Biberman-Norman theory is discussed.
- Publication:
-
AIAA Journal
- Pub Date:
- March 1976
- DOI:
- 10.2514/3.7104
- Bibcode:
- 1976AIAAJ..14..371V
- Keywords:
-
- Gas Mixtures;
- Gas-Gas Interactions;
- Molecular Gases;
- Radiation Measurement;
- Shock Wave Interaction;
- Absorption Spectra;
- Carbon Dioxide;
- Continuous Radiation;
- Gas Heating;
- Gas Pressure;
- Gas Temperature;
- Nitrogen;
- Photographic Recording;
- Shock Tubes;
- Spectral Energy Distribution;
- Fluid Mechanics and Heat Transfer