一种双S形二元排气系统红外特性的模型实验

通过模型实验测量了一种双S形二元(2-D)喷管排气系统壁面压力和温度分布,以及分别在侧向、下方和上方探测面上的红外辐射强度分布,并与基准轴对称排气系统作了对比分析。实验结果表明:双S形二元喷管排气系统在上方探测面上,红外辐射强度比较大,最大值出现在10°探测角；相比基准轴对称排气系统,双S形二元排气喷管系统红外辐射强度在0°探测角方位平均降低了75.5%,在侧向、下方及上方探测面上90°探测角方位分别降低了57.6%、50.9%和17.3%。 

Experiment on infrared signature of a model of serpentine two dimensional exhaust system

The pressure and temperature distributions on the surface of a model of serpentine two dimensional（2 D）nozzle exhaust system were measured, and its infrared radiation(IR) intensity on the side, lower and upper detection planes were also measured; these results were compared with those of a relevant axisymmetric exhaust system. The results showed that, the radiation intensity of serpentine 2 D nozzle exhaust system on the upper detection plane was much higher than that on other two planes, with the maximum value at angle 10°; compared with axisymmetric exhaust system, the radiation intensity of serpentine 2-D nozzle exhaust system reduced by 75.5% at angle 0°, and 57.6%, 50.9% and 17.3% at angle 90° respectively on the side, lower and upper detection planes.