基于STL文件的航天器固壁辐射热流计算方法

Numerical Computation of Solid Radiation Heat Flux of Spacecarft Based on STL File

针对STL文件在传递复杂几何实体模型信息方面具有精度高的特点,提出了一种基于STL文件计算航天器固壁辐射热流的方法,给出了STL文件的数据格式及其内容约定。根据面元间的位置关系对计算单元进行网格加密。利用有限元法计算角系数,详细阐述了基于STL文件进行复杂结构的遮挡判断方法。计算结果表明,方法的计算精度和计算效率高,遮挡判断方法准确高效。

Because STL file can transfer the information of solid model accurately, a method to compute solid radiation heat flux of spacecraft based on STL file was proposed. The data format and contents of STL file were presented. The grids were refined according to position of surface cells. View factors were computed by FEM （Finite Element Method） and shading judgment based on STL file were expatiated. The computing precision and efficiency of the method in this paper are higher and shading judgment method is correct and high efficient.