Generalized model for infrared perception from an engine exhaust

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Titre du document / Document title

Generalized model for infrared perception from an engine exhaust

Auteur(s) / Author(s)

HERAGU Srinath S.⁽¹⁾ ; RAO K. V. L.⁽¹⁾ ; RAGHUNANDAN B. N.⁽²⁾ ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

⁽¹⁾Aeronautical Development Agency, Bangalore 560 037, INDE
⁽²⁾Indian Institute of Science, Bangalore 560 012, INDE

Résumé / Abstract

A comprehensive scheme has been developed for the prediction of radiation from engine exhaust and its incidence on an arbitrarily located sensor. Existing codes have been modified for the simulation of flows inside nozzles and jets. A novel view factor computation scheme has been applied for the determination of the radiosities of the discrete panels of a diffuse and gray nozzle surface. The narrowband model has been used to model the radiation from the gas inside the nozzle and the nonhomogeneous jet. The gas radiation from the nozzle inclusive of nozzle surface radiosities have been used as boundary conditions on the jet radiation. Geometric modeling techniques have been developed to identify and isolate nozzle surface panels and gas columns of the nozzle and jet to determine the radiation signals incident on the sensor. The scheme has been validated for intensity and heat flux predictions, and some useful results of practical importance have been generated to establish its viability for infrared signature analysis of jets