用混合有限体积/有限元法研究尾焰对太阳辐射的吸收问题  

Study on the problem of the solar radiation absorbed by the plume using hybrid finite volume/finite element method

作　　者：金伟[1,2] 吕相银[2] 

机构地区：[1]电子工程学院脉冲功率激光技术国家重点实验室,安徽合肥230037 [2]电子工程学院安徽省红外与低温等离子体重点实验室,安徽合肥230037

出　　处：《红外与激光工程》2012年第5期1134-1139,共6页Infrared and Laser Engineering

基　　金：国家863计划(2008AA8090311)

摘　　要：为掌握卫星姿控推进器尾焰的吸收特性,研究了尾焰对太阳红外辐射的吸收问题。在直角坐标系下,建立了尾焰对太阳红外辐射的吸收模型,并采用混合有限体积/有限元法计算太阳光线经过尾焰吸收后的光谱辐射亮度。该方法使用有限元法进行角度离散,有限体积法进行空间离散;对每一个控制体,可同时耦合求出所有角度方向的辐射亮度。通过求解,得到了受到尾焰吸收后的太阳光谱辐射亮度和尾焰的光谱吸收率。以传递方程积分法的计算结果作为基准解,对比分析了有限体积法和混合有限体积/有限元法产生射线效应的强弱程度。通过分析可知:在某些波段上,太阳辐射受到尾焰的吸收程度较强;与有限体积法的计算结果相比,混合有限体积/有限元法的计算结果与基准解之间的差异相对较小。以上结果表明:混合有限体积/有限元法的计算精度较高,并能够较好地降低射线效应。In order to grasp the absorption characteristics of the satellite attitude-control thruster plume, the problem of the solar infrared radiation absorbed by the plume was studied. In the orthogonal coordinates, the model of the solar radiation absorbed by the plume was founded. The hybrid finite volume/finite element method was adopted to calculate the spectral luminance of the solar radiation which propagated through the plume. To use the finite element method for the angular discretization and the finite volume method for the spatial discretization, the radiative luminance of all the direction for a control volume could be solved by this method at the same time. The solar spectral luminance having propagated through the plume and the spectral absorptivity of the corresponding plume location were obtained after calculation. The calculation results of the radiative transfer equation integral method were considered as the benchmark, and both the ray effects of the finite volume method and the hybrid finite volume/finite element method were tested with comparison. Through analysis of the results, the solar radiation was absorbed deeply by both the attitude-control thrusters plume in several bands; the results of the hybrid finite volume/finite element method were closer to the benchmark than those of the finite volume method. It shows that the hybrid finite volume/finite element method can mitigate ray effects effectively and solve the problem of the solar infrared radiation absorbed by the plume accurately.

关 键 词：尾焰 吸收 太阳辐射 混合有限体积/有限元法 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]