全尺寸二元喷管红外辐射特性研究

 设计了一种全尺寸二元收敛喷管,用涡轮喷气发动机 WP-6作为燃气发生器,在发动机处于最大状态时,用红外光谱仪对二元喷管及尾喷流的红外辐射进行了测试。研究结果表明,与基准喷管相比,在发动机产生相同推力的条件下,二元喷管改善了喷口和尾焰红外辐射的光谱分布,减小了红外源的尖峰辐射,明显降低了发动机的红外辐射强度。

INFRARED EMISSIONS FROM TURBOJET WITH TWO-DIMENSIONAL NOZZLE

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.