固定翼飞机尾焰的红外辐射特性研究对红外探测、跟踪、制导等具有重要意义。利用MODTRAN软件计算大气透过率和程辐射,用8~14 μm长波红外测量设备对某型固定翼飞机非加力状态尾焰红外辐射亮度进行了测量。测量结果表明,非加力状态尾焰辐射亮度具有明显的方向性,迎头方向较弱,从50°到150°逐渐增强,150°方向平均辐射亮度为50°的5.2倍;90°方向尾焰辐射沿发动机喷管轴向呈对称性包络分布,随着与喷管轴向距离的增加逐渐减弱,辐射主要集中在发动机喷管出口附近的轴线两侧。150°方向尾焰辐射主要集中在发动机喷管出口附近,尾焰辐射亮度为喷管中心辐射亮度的15.4%。180°方向尾焰及喷管辐射亮度呈环形分布，从中心区域向外，尾焰辐射亮度分布的对称性和一致性逐渐下降。测量结果为尾焰红外辐射研究提供了重要的数据支持。

It is important to study the infrared radiation characteristics of fixed wing aircraft plume. MODTRAN software is used to calculate the atmospheric transmittance and path radiance. By using a long wave infrared measuring equipment for a certain radiation, with 8~14 μm type of fixed wing aircraft, the strength state plume infrared radiation intensity is measured. The measurement results show that the strength state of the tail flame radiation intensity has obvious directivity. It's less in head-on direction, and from 50° to 150°, it enhances gradually. The average radiation intensity of 150° is 5.2 times of the average of 50°. Along the direction of 90°, the tail flame radiation engine nozzle is distributed in the axial symmetry envelope. With the increase of axial distance and nozzle, the radiation are mainly concentrated in the engine on both sides of the axis of the nozzle exit. The plume radiation brightness of 150° direction is concentrated near the engine nozzle exit, and the tail flame radiation brightness is 15.4% of the nozzle center. The plume radiation brightness of 180° direction is annular distributed. From the central area to the outside, the symmetry and uniformity of the radiation brightness distribution of the tail flame decrease gradually. The measurement results provide important data support for the research of the plume infrared radiation.