Study on Infrared Stealth Scheme of Fully Shielded Guiding Strut Inside Exhaust System
The exhaust system of aircraft engines is the main source of infrared radiation in the tail direction of aircraft,and the suppression of infrared radiation of the exhaust system is the key to improving the level of aircraft infrared stealth.In order to solve the contradiction between the high infrared radiation signal and the difficulty of radiation suppression of the last stage turbine rotor,and achieve the breakthrough of infrared stealth level in the exhaust system of the aircraft engine,a concept structure of the fully shielded guiding strut behind the turbine is proposed.Through numerical simulation,the effect of the infrared stealth scheme of the fully shielded guiding strut on the infrared signal suppression of the exhaust system using active cooling and stealthy materials is analyzed.The results show that the infrared radiation contribution of the last stage turbine rotor is reduced to 0 by the fully shielded guiding strut.Wall cooling is the most effective infrared suppression measure for fully shielded guiding strut.And the maximum infrared radiation decrease is 40.46%when the average temperature drop is 300K.The optimal design of infrared suppression scheme for fully shielded guiding strut in a complex radiation environment is to optimize the surface emissivity design under the cooling condition of the wall.
fully shielded guiding strutinfrared radiationstealth schemesimulationexhaust system
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