轴对称喷管与后机身组合结构的红外特性实验

用实验的方法研究了背负式安装的轴对称喷管与具有双尾翼的飞机后机身组合结构的红外辐射特性,在几个典型平面内测量了组合结构的红外辐射强度的空间分布,并且将测量结果与单纯的轴对称喷管的红外辐射强度进行了比较。结果表明,在后下方平面内,由于后机身对喷管和喷流的遮挡,组合结构的红外辐射强度低于单纯的轴对称喷管,并且随喷口相对机身的内缩距离的增加而降低,但是在某些方向上,如后上方平面内,组合结构的红外辐射强度高于单纯的轴对称喷管。

Experiments on Infrared Radiation Characteristics of Combination Axisymmetric Nozzle and Aft Fuselage

A series of experiments are carried out to investigate the infrared characteristics of a combination structure of the axisymmetric nozzle and the aft fuselage with a pair of tail wings,in which the nozzle is installed on the back of the aft fuselage.The spacial distribution of the radiant intensity of the combined structure is measured on several typical planes,compared with that of the uninstalled axisymmetric nozzle.Results show that the infrared radiation of the combined structured is lower than that of the uninstalled axisymmetric nozzle on lower plane due to the shield of aft fuselage;and the infrared radiant intensity decreases with the increase of the axially forward shift distance of the nozzle relative to the aft fuselage.While in some other orientation,infrared radiant intensity of the combined structure is higher than that of the uninstalled axisymmetric nozzle,i.e.on upper plane.