A Study on the Infrared Signal Reduction by Particle Injection around Exhaust Plume

An experimental study was conducted to find out the characteristics of infrared signal reduction emitted from the plume when solid particles were sprayed around the jet engine exhaust plume.The high-temperature heating coil and gas torch were used to simulate the high-temperature exhaust section and plume of an aircraft engine.Solid particles were mixed with compressed air and sprayed around the heating coil, and the plume generated by the gas torch.Carbon Black, SiO 2 , and TiO 2 particles were utilized, and an infrared camera was used to measure the infrared signals before and after particle injection.When particles were injected into the heating coils, the size of the infrared signal decreased by approximately 77% at most.However, when solid particles were injected around the plume of the gas torch, the particles were heated by the high-temperature combustion gases, and the magnitude of the infrared signal tended to increase. . . . Carbon Black, SiO 2 , TiO 2 , . 77% . .