飞机尾流RCS计算中的网格剖分技术

内容简介：飞机尾流雷达散射截面（RCS）通常可通过求解尾流的被动保守量和介电常数分布，对尾流区域的电场积分得到。实现尾流区域离散化处理，现有方法一般采用满足被动保守量求解精度要求的非均匀网格剖分技术。由于该剖分存在大量尺度与电磁波长相当甚至更大的网格，因此，不能直接用于计算尾流RCS。针对该问题，提出了一种线性插值处理方法，把被动保守量从被动保守量计算的非均匀网格上映射到满足RCS计算要求的均匀细网格上。该方法在保证较高的电磁计算精度的情况下，避免了使用电磁计算细网格求解被动保守量导致的计算量急剧增加。通过数值实验验证了本处理方法的高效性。

Abstract：A commonly used method to calculate the RCS of an aircraft wake vortex （WV）is to integrate the electric fields of the WV after calculating the passive conservation and the dielectric constants. During the simulation, the zone concerned need to be partitioned. Generally, non-uniform grids which satisfy the precision de- mand of the passive conservative calculation are adopted in the existing methods. However, these grids are not suitable to be directly used to compute the RCS be- cause many of them are comparable or even much larger than the wavelength of the incident wave. In order to solve this problem, a linear interpolation method is pro- posed to handle the relationship between the fine uniform grids for the RCS calcula- tion and the non-uniform grids for the passive conservative simulation. Not only can this method obtain accurate RCS result, but also avoid the rapid increase of computational cost while simulating the passive conversation on the fine uniform grids. Numerical experiments show the high efficiency of this method.

作者：屈龙海, 李健兵, 王雪松, 王涛,

关键词：雷达散射截面, RCS, 飞机尾流, 被动保守量, 非均匀网格, 线性插值,