Computational Investigation of the Effect of Various Flight Conditions on Plume Infrared Signature

Kim, Joon‐Young; Chun, Soo-Hwan; Myong, R.S.; Kim, Won-Cheol

doi:10.5139/jksas.2013.41.3.185

Journal of the Korean Society for Aeronautical & Space Scie

2013

DOI: 10.5139/jksas.2013.41.3.185

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Computational Investigation of the Effect of Various Flight Conditions on Plume Infrared Signature

Joon‐Young Kim¹,

Soo-Hwan Chun²,

R.S. Myong³

et al.

Abstract: The plume infrared signature effects at various flight conditions of aircraft were investigated for the purpose of reducing infrared signature level. The nozzle of a virtual subsonic unmanned combat aerial vehicle was designed through a performance analysis.Nozzle and associated plume flowfields were first analyzed using a density-based CFD code and plume IR signature was then calculated on the basis of the narrow-band model.Finally, qualitative information for the plume infrared signature characteristics was … Show more

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Cited by 5 publications

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Computational Investigation of the Effect of UAV Engine Nozzle Configuration on Infrared Signature

Kang¹,

Kim

Myong³

et al. 2013

Journal of the Korean Society for Aeronautical & Space Scie

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The effects of various nozzle configurations on infrared signature are investigated for the purpose of analysing the infrared signature level of aircraft propulsion system. A virtual subsonic aircraft is selected and then a circular convergent nozzle, which meets the mission requirements, is designed. Convergent nozzles of different configurations are designed with different geometric profiles. Using a compressible Navier-Stokes-Fourier CFD code, an analysis of thermal flow field and nozzle surface temperature distribution is conducted.

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Computational Investigation of the Effect of UAV Engine Nozzle Configuration on Infrared Signature

Kang¹,

Kim

Myong³

et al. 2013

Journal of the Korean Society for Aeronautical & Space Scie

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

Kang

Kim²,

Myong³

et al. 2014

Journal of the Korean Society for Aeronautical & Space Scie

Self Cite

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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.

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Investigation of the Effects of UAV Nozzle Configurations on Aircraft Lock-on Range

Kim¹,

Kang

Myong³

et al. 2015

Journal of the Korean Society for Aeronautical & Space Scie

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The infrared lock-on range of target aircraft plays a critical role in determining the aircraft survivability. In this investigation, the effects of various UAV engine nozzle configurations on the aircraft lock-on range were theoretically analyzed. A virtual subsonic aircraft was proposed first, based on the mission requirement and the engine performance analysis, and convergent-type nozzles were then designed. After determining thermal flow field and nozzle surface temperature distribution with the CFD code, an additional analysis was conducted to predict the IR signature. Also, atmospheric transmissivity for various latitude and seasons was calculated, using the LOWTRAN code. Finally, the lock-on and lethal envelopes were calculated for different nozzle configurations, assuming the sensor threshold of the given IR guided missile. It was shown that the maximum 55.3% reduction in lock-on range is possible for deformed nozzles with the high aspect ratio.

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Computational Investigation of the Effect of Various Flight Conditions on Plume Infrared Signature

Cited by 5 publications

References 8 publications

Computational Investigation of the Effect of UAV Engine Nozzle Configuration on Infrared Signature

Computational Investigation of the Effect of UAV Engine Nozzle Configuration on Infrared Signature

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

Investigation of the Effects of UAV Nozzle Configurations on Aircraft Lock-on Range

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