Abstract: A study for the infrared characteristic at 3μm～5μm wave band of the individual exhaust nozzle and mixing exhaust nozzle for a turbofan engine was conducted and the computational results are compared with that the model nozzle experiment. The results reveal that the spatial and spectral distribution of the infrared radiation of the two exhaust nozzles are similar, but radiation intensity and spectral radiant intensity of the two exhaust nozzles have significant difference. The mixing exhaust nozzle has significant potential to meet the challenges of reducing exhaust system infrared radiation.

Key words: Turbofan engine;Exhaust system;Infrared radiation

摘要： 针对弹用涡扇发动机,计算和比较了3μm～5μm波段轴对称分开排气喷管和轴对称混合排气喷管的红外辐射特性,并与模型实验的结果进行了比较。结果表明,两种类型的排气喷管在红外辐射的空间分布和光谱分布特性方面具有相似的特征,但是红外辐射强度的数值有较大差别;内、外涵混合排气,可以显著降低喷管空腔、尾喷流和整个排气系统的红外辐射。

关键词: 涡轮风扇发动机;排气系统;红外辐射