Abstract:

Investigated in this paper is the infrared radiation(IR) from a large-scale convergent two-dimensional nozzle attached to a sort of turbojet called WP-6 which can generate the maximum thrust of 2600 kg force at the full state. The IR signatures emitted from the two-dimensional nozzle and hot plume are measured with the infrared spectrum radiometer of 12-550 Mark II model made by BARNES Ltd. in USA in the open air during night as well as that of the conic nozzle served as datum exhaust which may produce the same thrust as the two-dimensional one. The results indicate that the spectrum distributions of the two-dimensional nozzle are improved and the wave length corresponding to the maximum spectrum intensity is shifted up to a longer waveband. Compared with the IR from the conic nozzle, IR signature of the plume issuing from the two-dimensional nozzle which has an aspect-ratio parameter of 2.25 is decreased by 60% over the band range of 4.0~4.7μm.

Key words: trubojet, two-dimensional nozzle, hot plume, conver gentnozzle, infrared radiation