Calculation and Analysis of Infrared Radiation and Radar Scattering Characteristics of Stealth Helicopter
To achieve the infrared/radar integrated stealth of a helicopter,the integrated infrared suppressor was incorporated into the design of stealth helicopter.Through numerical simulation,the temperature field,infrared radiation characteristics and radar scattering characteristics of stealth hel-icopter in hover were calculated.Results showed that under the combined effect of the ejected flow of integrated infrared suppressor and downwash airflow,the mixing duct and rear fuselage of stealth helicopter could be effectively cooled.Under the influence of tail rotor airflow,the local heating effect of the high-temperature exhaust on left fuselage was more significant.Due to the integrated design scheme of the exhaust system and rear fuselage,the latter could effectively shield the high-temperature mixing duct,therefore,total infrared radiation in 3～5 μm band was mainly from gas and fuselage skin.However,for 8～14 μm band,gas infrared radiation could be neglected.At 3 GHz,6 GHz,10 GHz and 15 GHz frequencies,the RCS mean of the stealth helicopter throughout the entire circumference was controlled below 4 dBsm,which indicated that the integrated design scheme could not only reduce infrared radiation but also have good radar stealth capability.
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