A WIND TUNNEL MEASUREMENT OF FLUCTUATIONS IN INFRARED EMISSION FROM A TURBULENT MIXING LAYER
Abstract
An investigation is reported of the fluctuating IR emission from hot air in a turbulent shear layer. A wind-tunnel experiment was conducted in which the free shear layer at the exit of a Mach 7 nozzle was observed with an AC radiometer. The radiating species was CO2 and the spectral response of the radiometer limited the observations to ists 2.7 micron band. The data were reduced both to broadband (25-25,000 cps) radiant emittance and to spectral density curves. Results obtained were compared with an analytical prediction of radiant emittance and good agreement has been obtained for one of the proposed models of turbulence intensity. The spectral density curves are peaked and the characteristic frequencies are partly consistent with those measured with hot wires in subsonic jets. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1964
- Accession Number
- AD0356438
Entities
People
- Jacques A. F. Hill
- James S. Draper
- Lawrence D. Lorah