过氧化氢-煤油火箭发动机喷流红外辐射亮度的精确测量

姿轨控火箭发动机喷流红外辐射特性的定量测量，是飞行器突防效能研究以及喷流流场数值模拟计算模型验证中的一个关键环节。为定量研究火箭发动机喷流红外辐射场分布，对某型过氧化氢-煤油小火箭发动机进行了喷流红外辐射特性测量实验。使用的制冷型中波红外相机波段为3.7~4.8 μm，该相机探测阵元平均噪声等效温差为16 mK，输出16 bits信号，具有高灵敏度和大动态范围。通过对红外相机的黑体辐射定标，并对定标误差进行分析，反演所测灰度值图像，在与喷流垂直方向得到中波红外波段的喷流辐射亮度分布。测量结果表明，小火箭发动机喷流中马赫盘结构位置清晰，喷流在中波红外波段的峰值辐射亮度为184 W/（m2·sr），辐射测量精度为12 W/（m2·sr）。

Accurate infrared radiance measurement of H2O2-kerosene rocket engine flume

The quantitative measurement of infrared radiation (IR) of the attitude and orbit control rocket engine flume plays a key role in the aircraft penetration effectiveness research and in verification of the numerical simulation of the rocket engine flume flow field. In order to study the IR field of the rocket engine flume quantitatively, an experiment is conducted to measure the IR characteristics of the flume of one H₂O₂-kerosene small rocket engine. A cooled midwave infrared camera with a spectral band of 3.7~4.8 μm is developed. The detector, which has a mean NETD of 16 mK and an output resolution of 16 bits, is highly sensitive and has a wide dynamic range. With radiation calibration and calibration error analysis, the obtained grayscale images are converted, and the IR field distribution of the engine flume in the midwave infrared spectral band is acquired. The experiment result shows distinct Mach disks in the plume, and the peak radiation of the plume in the midwave infrared spectral band is 184 W/(m2·sr) with a measurement accuracy of 12 W/(m2·sr).