液体火箭发动机羽烟紫外辐射特性分析

Analysis of Ultraviolet Radiation Characteristics of Liquid Propellant Rocket Motor Exhaust Plumes

通过分析火箭发动机羽烟的紫外辐射机理,建立了适用于热发射、CO+O化学发光、OH自由基化学发光的液体火箭发动机羽烟紫外辐射模型,可以考虑热发射、CO+O化学发光、OH自由基化学发光等紫外辐射机理。在分别计算流场和辐射传输的基础上,分别采用二维和三维网格计算流场参数和辐射传输,既节省了计算时间,还可得到羽烟在不同视角的紫外光谱辐射强度分布和二维辐亮度分布。利用火箭发动机羽烟紫外辐射模型,计算了液氢/液氧和航空煤油/液氧两种双组元液体推进剂火箭发动机羽烟的紫外光谱辐射强度分布和二维辐亮度分布,并以液氢/液氧推进剂为例,研究了液体混合比对液体火箭发动机羽烟紫外辐射分布的影响。研究结果可以为紫外导弹预警系统判断导弹所采用的液体火箭发动机类型,以及液体火箭发动机导弹紫外隐身性能的改进提供参考。

Through the analysis of ultraviolet radiation mechanism of liquid propellant rocket motor exhaust plumes, a rocket motor plume ultraviolet radiation model was build, taking thermal emitting, CO ＋ O chemiluminescence and OH radical chemiluminescence into consideration. Based on the separate calculation of flowfield and radiation transfer, the flowfield and radiation intensity distribution can be solved using 2-D and 3-D grids, respectively, which can save the computation time and get both of the spectrum of radiation intensity and the radiance at different angle of view distribution. The ultraviolet spectral radiation intensity as well as the two-dimensional radiance distribution at 90° angle of view of liquid hydrogen/liquid oxygen and kerosene/liquid oxygen bipropellant rocket motor plumes were calculated using the rocket motor plume ultraviolet radiation model, respectively. The influence of mixture ratio on ultraviolet radiation distribution of liquid bipropellant rocket motor plumes was studied by taking liquid hydrogen/ liquid oxygen as an example. This study can provide reference for the analysis, design and optimization of ultraviolet early warning system, the judgment of missile types in the process of early warning, and the evaluation and improvement of missile ultraviolet stealth performance.