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

Kang, Dongwoo; Kim, June-Young; Myong, R.S.; Kim, Won-Cheol

doi:10.5139/jksas.2013.41.10.779

Cited by 5 publications

(2 citation statements)

References 6 publications

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“…To conduct the thermal flowfield analysis for the plume and the inside of the nozzle, a compressible Navier-Stokes-Fourier code CFD-FASTRAN was used [20]. This enabled the analysis of high subsonic, supersonic, and transonic flow domains, which entail shock waves and jet boundaries.…”

Section: B Validation Of Thermal Flowfield Analysismentioning

confidence: 99%

Analysis of Plume Infrared Signatures of S-Shaped Nozzle Configurations of Aerial Vehicle

Kang

Baek

et al. 2016

Journal of Aircraft

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The infrared susceptibility of the propulsion system of an aircraft is significantly affected by nozzle shapes and atmospheric conditions. To examine the effects of nozzle shapes and atmospheric conditions, various nozzle shapes were selected by considering a representative low-observable unmanned aerial vehicle and its propulsion system. Then, using the density-based Navier-Stokes-Fourier computational-fluid-dynamics code, the thermal flowfield and the distribution of chemical species within a plume, which are essential for the analysis of infrared signatures, were calculated. From the analysis of plume infrared signatures for noncircular nozzles, it was found that infrared signature levels were reduced significantly in the axial direction. However, relatively higher signature levels were observed on the left and right sides and below the nozzle due to increase in the aspect ratio of the nozzle outlet as well as curvature, which led to a wider distribution of the plumes along a downward slope. Further, to take into account atmospheric effects, the atmospheric transmissivity according to changes of season and observational distance was analyzed in detail. Finally, the lock-on range was calculated for different nozzle configurations and was compared with the basic circular shape.Article in Advance / 1 JOURNAL OF AIRCRAFT Downloaded by RMIT BUNDOORA LIBRARY on June 23, 2016 | http://arc.aiaa.org |

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Section: B Validation Of Thermal Flowfield Analysismentioning

confidence: 99%

Analysis of Plume Infrared Signatures of S-Shaped Nozzle Configurations of Aerial Vehicle

Kang

Baek

et al. 2016

Journal of Aircraft

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“…The component ratio of species at nozzle 법칙에 따른 Schmidt수를 사용하였다.또한 검증의 완성도를 높이기 위해 이전연구[14, 18]에서 고려된 경우 외에 추가적인 검증 케 이스를 고려하였다. 검증은 다양한 축소각을 갖 는 노즐에 대해서 노즐 입구 압력과 외부 대기 압력비(NPR)에 따른 열유동장을 CFD를 통해 계 산하여 실제 풍동 실험결과의 노즐 벽면 근처 마 하수와 비교하였다.…”

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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

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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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A computational study of two-dimensional serpentine nozzle performance with different annular mixer configurations

Abdelmotalib

Lee²,

Seo

et al. 2021

International Journal of Mechanical Sciences

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

Cited by 5 publications

References 6 publications

Analysis of Plume Infrared Signatures of S-Shaped Nozzle Configurations of Aerial Vehicle

Analysis of Plume Infrared Signatures of S-Shaped Nozzle Configurations of Aerial Vehicle

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

A computational study of two-dimensional serpentine nozzle performance with different annular mixer configurations

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