Methods of numerical simulation of the IR radiation of gas turbine engines to evaluate the possibility of reducing the visibility of aircrafts

Melezhik, EO
1Sizov, FF
Shevchuk, OV
Gumenjuk-Sichevska, JV
1V.Ye. Lashkaryov Institute of Semiconductor Physics of the NAS of Ukraine, Kyiv
Dopov. Nac. akad. nauk Ukr. 2020, 4:43-52
https://doi.org/10.15407/dopovidi2020.04.043
Section: Physics
Language: Russian
Abstract: 

Numerical methods for modeling the infrared (IR) radiation of gas turbine engines (GTE) existing in the literature are considered. The composition of the exhaust gases of the GTE is described, and the data on the main spectral properties of such gases are considered. It is shown that while exhaust gases of gas turbine engine consist mainly of CO2, H2O, and N2, the main contribution to their total IR emission is made by CO2 and H2O, while role of N2, CO, and compounds like SO2, H2, O2, or NOx is negligible. The presence of soot in the exhaust plume results into the additional scattering of radiation on soot particles and a partial smoothing of the emission spectra of exhaust gases. This data should be taken into account when modeling the IR radiation of the engine. An overview of the existing numerical methods for calculating the interaction of IR radiation with a gas inside the GTE is provided. The literature data on the accuracy of such methods is given, and the factors affecting such accuracy for different methods are considered. The advantages and disadvantages of line-by-line, narrow band, and global gas modeling methods for the use in engineering calculations by aircraft constructors are presented. The methods most acceptable in terms of accuracy, simplicity and speed of calculation are pointed. The list of the main approaches to the numerical modeling of radiation transfer in GTE between its inner parts and the gas inside is given. The differences of implementations of the numerical algorithm based on the Monte Carlo method for different formulations of the problem of IR-visibility of GTE are shown. The appliance of gas modeling methods for calculations of IR field near the nozzle and at the large distances from the engine is discussed. The most optimal method for the numerical finding of the angular distribution of IR radiation in the rear hemisphere behind the engine nozzle is selected.

Keywords: gas turbine engine, IR visibility, numerical methods
References: 

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