Accession Number:

ADA076199

Title:

Development and Validation of Standardized Infrared Radiation Model (SIRRM). Gas/Particle Radiative Transfer Model

Descriptive Note:

Computer code development rept. 8 Sep 1978-30 Jun 1979

Corporate Author:

PHOTON RESEARCH ASSOCIATES INC LA JOLLACA

Report Date:

1979-10-30

Pagination or Media Count:

173.0

Abstract:

Analytical models have been developed to treat the coupled gas particle radiative transfer in exhaust plumes, monochromatically and in a band model approach. In addition, the availability of the particle optical parameters has been investigated. The requirements for the plume scattering model in SIRRM are Coupled emission, absorption and scattering treatment Multiple scattering with cylindrical geometry Three-dimensional, non-uniform, axisymmetric medium Arbitrary particle mixtures and size distribution Line-by-line and band-model treatments and Alternate levels of engineering approximation. These requirements are met by developing two basic approaches, a 6-flux and a N-flux approach. This distinction refers to the associated subdivision in angular space, six-orthogonal coordinates versus N nonorthogonal coordinates in azimuth and elevation, thus providing the alternatives of computational simplicity of the 6-flux model with generality of the N-flux model. Numerous parametric calculations were performed to study the effect of optical depth, scattering albedo, phase function and medium geometry on the target signature and computational requirements.

Subject Categories:

  • Theoretical Mathematics
  • Radioactivity, Radioactive Wastes and Fission Products
  • Optics
  • Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE