To achieve the infrared/radar integrated stealth of a helicopter, the integrated infrared suppressor is incorporated into the design of stealth helicopter. Using CFD simulation, forward-backward ray-tracing method, and physical optics method, the temperature field, infrared radiation characteristics and radar scattering characteristics of stealth helicopter in hover are calculated. Results show 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 can be effectively cooled. Under the influence of tail rotor airflow, the left fuselage is heated locally by high-temperature exhaust gas. Due to the integrated design scheme of the exhaust system and rear fuselage, the latter can effectively shield the high-temperature mixing duct, therefore, total infrared radiation in 3~5 μm band is mainly from gas and fuselage skin, and their magnitudes are comparable. However, for 8~14 μm band, gas infrared radiation can be neglected. At 3 GHz, 6 GHz, 10 GHz and 15 GHz frequency points, the RCS mean of the stealth helicopter throughout the entire circumference is controlled below 4 dBsm, which indicates that the integrated design scheme can not only reduce infrared radiation but also have good radar stealth capability.
Calculation and analysis of infrared radiation and radar scattering characteristics of stealth helicopter
2023-01-01
1960727 byte
Conference paper
Electronic Resource
English
Research on infrared stealth system for armed helicopter
British Library Online Contents | 2003
|Elsevier | 2023
|Radar scattering characteristics and RCS reduction of utility helicopter
British Library Online Contents | 2013
|Radar scattering characteristic test and analysis of two stealth aircraft models
British Library Online Contents | 2003
|