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http://dx.doi.org/10.5139/JKSAS.2014.42.1.10

Investigation of Aircraft Plume IR Signature for Various Nozzle Configurations and Atmospheric Conditions  

Kang, Dong-Woo (Department of Aerospace and System Engineering and Research Center for Aircraft Parts Technology, Gyeongsang National University)
Kim, In-Deok (Department of Aerospace and System Engineering and Research Center for Aircraft Parts Technology, Gyeongsang National University)
Myong, Rho-Shin (Department of Aerospace and System Engineering and Research Center for Aircraft Parts Technology, Gyeongsang National University)
Kim, Won-Cheol (Agency for Defense Development)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.42, no.1, 2014 , pp. 10-19 More about this Journal
Abstract
Nozzle configurations and atmospheric conditions play a significant role in the infrared signature level of aircraft propulsion system. Various convergent nozzles of an unmanned aircraft under different atmospheric conditions are considered. An analysis of thermal flow field and nozzle surface temperature distribution is conducted using a compressible CFD code. It is shown that the IR level in rear direction is considerably reduced in deformed nozzles, whereas the IR level in adjacent azimuth angles is increased in aspect ratios around 6 due to the plume spreading effect caused by high aspect ratio of nozzles. In addition, an analysis of atmospheric transmissivity for various seasons and observation distance is conducted using the LOWTRAN 7 code and subsequently plume IR signature is calculated by considering atmospheric effects. It is shown that the IR signature is reduced significantly in summer season and near the band of carbon dioxide in case of relatively close distance.
Keywords
Infrared signature; Plume flow field; Atmospheric transmissivity;
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Times Cited By KSCI : 3  (Citation Analysis)
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