喷气式飞机尾喷管及尾焰红外辐射特性测量分析

Measurement and analysis of infrared radiation characteristics of jet airplane nozzle and flame

用3~5μm中波、8~12μm长波红外热像仪对某喷气式飞机侧飞状态的红外辐射特性进行了测量,得到该飞机尾喷管及尾焰的红外辐射亮度分布。结果表明,该状态下尾焰中波、长波辐射呈现对称包络分布,随着距离的增加,尾焰喷气束逐渐扩散,辐射亮度逐渐减弱。相同情况下,中波波段尾焰长度为长波的3.5倍左右、面积为6.3倍左右;尾喷管为该飞机辐射亮度最高的部位,中波辐射亮度对比度达到了20.1,长波辐射亮度对比度达到了8.2。

The infrared radiation characteristics of a jet airplane in side-flying state are measured by a 3~5μm medium-wave and 8~12μm long-wave thermal imager,and the infrared radiation luminance distribution of the jet nozzle and tail flame is obtained.The results show that the mid-wave and long-wave radiation of the tail flame in this state presents a symmetrical envelope distribution,and with the increase of distance,the jet beam of the tail flame gradually diffuses,and the radiation brightness gradually decreases.Under the same circumstances,for the same case,the medium-wave band tail flame is about 3.5 times longer and 6.3 times larger than the long-wave one.The tail nozzle is the brightest part of the aircraft′s radiation,with contrast ratios of 20.1 in the medium-wave radiation and 8.2 in the long-wave radiation.