Accession Number : AD0472658


Title :   Air Radiation Graphs: Spectrally Integrated Fluxes Including Line Contributions and Self Absorption


Descriptive Note : Research rept.


Corporate Author : AVCO EVERETT RESEARCH LAB INC EVERETT MA


Personal Author(s) : Allen, Richard A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/472658.pdf


Report Date : Sep 1965


Pagination or Media Count : 57


Abstract : Calculations were made of the equilibrium radiation emitted from air over a range of temperatures from 2,000 K to 23,000 K and over a density range from 10 to the -6th power to 10 atmospheres. The calculations are presented in graphical form and are in terms of the radiation flux emitted from one side of infinite slabs of finite thickness. The molecular band systems were calculated using a smeared rotational model, and are carried out for a slab thickness of 1 cm. Atomic line and free-bound transitions are important contributors at elevated temperatures and also generally undergo significant amounts of self- absorption. Consequently calculations of these two classes of radiation were made with slab thickness as an added parameter. The lines, free-bound and free-free radiation were also split into the two spectral regions for the radiation flux above and below 2000 Angstroms.


Descriptors :   *DIATOMIC MOLECULES , AERODYNAMIC HEATING , AIR , ATMOSPHERE ENTRY , HIGH TEMPERATURE , MATHEMATICAL ANALYSIS , REENTRY VEHICLES , TABLES(DATA) , THERMAL RADIATION


Subject Categories : Atomic and Molecular Physics and Spectroscopy


Distribution Statement : APPROVED FOR PUBLIC RELEASE