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

Kang, Dongwoo; Kim, In-Deok; Myong, R.S.; Kim, Won-Cheol

doi:10.5139/jksas.2014.42.1.10

Journal of the Korean Society for Aeronautical & Space Scie

2014

DOI: 10.5139/jksas.2014.42.1.10

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

Dongwoo Kang

In-Deok Kim²,

R.S. Myong³

et al.

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 increas… Show more

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Cited by 3 publications

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Spectral Infrared Signature Analysis of the Aircraft Exhaust Plume

구본찬¹,

백승욱²,

이경주³

et al. 2014

Journal of the Korean Society for Aeronautical & Space Scie

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Infrared signature of aircraft exhaust plume is the critical factor for aircraft survivability. To improve the military aircraft survivability, the accurate prediction of infrared signature for the propulsion system is needed. The numerical analysis of thermal fluid field for nozzle inflow, free stream flow, and plume region is conducted by using the in-house code. Weighted Sum of Gray Gases Model based on Narrow Band with regrouping is adopted to calculate the spectral infrared signature emitted from aircraft exhaust plume. The accuracy and reliability of the developed code are validated in the one-dimensional band model. It is found that the infrared radiant intensity is relatively more strong in the plume through the analysis, the results show the different characteristic of the spectral infrared signature along the temperature, the partial pressure, and the species distribution. The continuous spectral radiant intensity is shown near the nozzle exit due to the emission from the nozzle wall.

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Spectral Infrared Signature Analysis of the Aircraft Exhaust Plume

구본찬¹,

백승욱²,

이경주³

et al. 2014

Journal of the Korean Society for Aeronautical & Space Scie

View full text Add to dashboard Cite

show abstract

Measurement and Validation of Infrared Signature from Exhaust Plume of a Micro-Turbo Engine

Gu¹,

Baek²,

Jegal³

et al. 2016

Journal of the Korean Society for Aeronautical & Space Scie

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Development of an accurate infrared signature (IR) measurement system is expected to contribute in the development of low observable technology and the spectroscopic analysis of electromagnetic radiation.Application of a spectroradiometer (SR) allows for the measurement of detailed infrared signature from the exhaust plume due to its own heat source. Establishment of a measurement system using a micro-turbo engine is intended to simulate the modelling of the aircraft plume. The engine was installed on a test stand to measure the engine performance. The IR signature was measured by placing the SR perpendicular to the axis line of the exhaust plume. Reference data from the blackbody were also measured to calibrate the raw data, and the infrared signature of the background was also measured for comparison with that of the plume. The calibrated spectral radiance was obtained through the data reduction process and the results were analyzed in specific bands. The experiments revealed that the measurement system established here showed sufficient performance for further comprehensive analysis.

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Infrared Reflector Design using the Phase Field Method for Infrared Stealth Effect

Heo

Yoo²

2015

jcoseik

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In this paper, infrared reflector design targeting infrared stealth effect is presented using structural optimization based on the phase field method. The analysis model was determined to accomplish the design that an incident infrared wave was reflected to a desired direction. The design process was to maximize the objective value at the measuring domain located in a target region and the design objective was set to the Poynting vector value which represents the energy flux. Optimization results were obtained according to the variation of some parameter values related to the phase field method. The model with a maximum objective value was selected as the final optimal model. The optimal model was modified to eliminate the gray scale using the cut-off method and it confirmed improved performance. In addition, to check the desired effect in the middle wave infrared range(MWIR), the analysis was performed by changing the input wavelength. The finite element analysis and optimization process were performed by using the commercial package COMSOL combined with the Matlab programming.

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

Cited by 3 publications

References 7 publications

Spectral Infrared Signature Analysis of the Aircraft Exhaust Plume

Spectral Infrared Signature Analysis of the Aircraft Exhaust Plume

Measurement and Validation of Infrared Signature from Exhaust Plume of a Micro-Turbo Engine

Infrared Reflector Design using the Phase Field Method for Infrared Stealth Effect

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