姿控发动机羽流的可见光/近红外特性

为了研究发动机羽流辐射特性对光学探测成像的影响,基于不同直径粒子散射理论、辐射传递方程和分子吸收线数据库,应用有限体积法,建立了火箭发动机羽流在不同波段的辐射特性计算程序.针对实际工作情况进行建模,开展某姿控发动机工作在环月球轨道时的可见及近红外波段羽流的辐射特性计算.在0.4~0.9μm波长范围内,针对羽流气体组分、波长、观察天顶角以及太阳辐射对羽流光谱的影响作了数值计算及分析.研究结果表明:应用有限体积法开发的程序较好地模拟火箭发动机羽流的辐射特性,并具有广泛适用性;在可见光和近红外波段,太阳辐射作用对火箭发动机喷流辐射特性影响最大. 

Visible/near infrared radiation characteristics of attitude-control engine exhaust plume

In order to study the plume radiation effects on optical detecting and imaging,based on the scatted theories of different diameter particles,the radiation transition equation and the database of molecular absorption lines,a program using the finite volume methods was developed to simulate the plume radiation characteristics in variable wave bands.Modeling the actual working conditions,the visible and near infrared radiation characteristics of attitude control engine plume working in lunar orbit was computed.In 0.4～0.9μm,the effects of composite gas component,the wavelength,the detected zenith and the solar incidence on the plume radiation were simulated and analyzed.The result shows that the program based on finite volume methods can simulate the plume radiation characteristic accurately and be applied diffusely;solar radiation is the greatest influential factor of plume radiation in the visible and near infrared wave band.