Impact of Background Radiation on the Long Wave Infrared Radiation Characteristics of Aircraft at High Altitude

Wei Huang; Hong-hu Ji

doi:10.14429/dsj.66.8090

Wei Huang Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing University of Aeronautics and Astronautics, Nanjing
Hong-hu Ji Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing University of Aeronautics and Astronautics, Nanjing

DOI: https://doi.org/10.14429/dsj.66.8090

Keywords: Infrared radiation, aircraft, high altitude, infrared radiation signature

Abstract

Reflected background infrared radiation is an important contributor to the aircraft total infrared radiation. A reverse Monte Carlo ray tracing method to compute the infrared radiation signature of aircraft was introduced. The impact of atmospheric and ground radiation on the long wave infrared radiation signature of aircraft at the altitude of 11 km is analysed. The flight speed is Mach 0.8. The horizontal detection directions, downward detection directions and upward detection directions are considered. The results show that in the horizontal plane, the ratio of reflected background infrared radiation to self infrared radiation is about 10 per cent in summer, and 7 per cent in winter; the ratio values distributed in the front and side of the aircraft are bigger than that in the rear; and the existence of atmospheric and ground infrared radiation makes the apparent radiance temperature of the lower part of the aircraft higher than that of the upper part of the aircraft.

Author Biographies

Wei Huang, Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing University of Aeronautics and Astronautics, Nanjing

Dr W Huang obtained his PhD from Nanjing University of Aeronautics and Astronautics, China. He is currently working in Nanjing University of Aeronautics and Astronautics. He is having expertise in computational and experimental investigation of flow and heat transfer of aircraft. He is working in the area of radiative heat transfer of aero-engine and aircraft, infrared stealth of aircraft.

Hong-hu Ji, Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing University of Aeronautics and Astronautics, Nanjing

Dr H-H Ji obtained his PhD from University of Manchester Institute of Science and Technology, U.K. He is currently working as an outstanding professor at College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, China. He is working in the area of heat and mass transfer of aero-engine, ice accretion on the inlet components of aircraft engine, sealing of aero-engine and infrared stealth of aircraft etc.