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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8~14μm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。
The research on the infrared radiation characteristics of the tail flame of fixed-wing aircraft is of great significance to the infrared detection, tracking and guidance. The MODTRAN software was used to calculate the atmospheric transmittance and range radiation. The infrared emission brightness of the tail flame of a fixed-wing aircraft was measured by 8 ~ 14μm long-wave infrared measuring equipment. The measurement results show that the radiation intensity of the tail flame in the non-force state has obvious directionality, and the heading direction is weaker, gradually increasing from 50 ° to 150 °, and the average radiation brightness in the direction of 150 ° is 5.2 times of 50 °. The tail flame in the 90 ° direction Radiation along the axial symmetry of the engine nozzle envelope distribution, with the nozzle axial distance increases gradually diminished, the radiation is concentrated in the nozzle near the engine on both sides of the axis. The tail flame radiation in the direction of 150 ° is mainly concentrated near the nozzle exit of the engine, and the tail flame radiation intensity is 15.4% of the radiation center of the nozzle. The radiant brightness of the tail flame and the nozzle in the direction of 180 ° is distributed in a ring shape. From the central region to the outside, the symmetry and consistency of the emission brightness distribution of the tail flame gradually decrease. The measurement results provide important data support for the research of tail-flame infrared radiation.