收扩喷管加小突片对尾喷流红外辐射的影响
Effect of Tabs Fixed on a Convergent-Divergent Nozzle on Infrared Radiation of Exhausting Jet
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摘要: 针对收扩喷管,在高温(约640℃)、高速(超音速)流动状态下,实验研究了加装小突片后对飞机发动机尾喷流红外辐射的抑制效果,并探讨了小突片堵塞比、小突片后倾角度等因素对红外辐射抑制特性的影响。结果表明,小突片对热射流的红外辐射具有明显的抑制作用,不仅使热射流的核心区长度大为缩短,而且使热射流的总体红外辐射信号大幅度下降(在本文实验范围内,最大可下降约57%)。Abstract: The effect of tabs fixed on a convergent-divergent nozzle on the infrared radiation of the exhausting high speed (subsonic and supersonic) hot (about 640℃) jet was investigated,and the influence of tab block ratio and inclined angle on the suppression of infrared radiation was studied.The results show that tabs can cut down a good lot of hot jet core length and suppress the infrared radiation up to 57% from the hot jet.The increase in tab block ratio of 1% decreases the infrared radiation intensity of the whole hot exhausting gas by about 5 5% in average,and the increase in tab inclined angle by 1 degree can suppress the infrared radiation intensity of the whole hot exhausting gas by about 0 21% in average in the test conditions.
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Key words:
- convergent-divergent nozzle /
- small tabs /
- infrared radiation
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